CN116024975B - An offshore deep mixing pile water-to-land construction system and construction method - Google Patents

Abstract

The invention relates to a marine deep mixing pile water-land construction system and a construction method. A marine deep mixing pile water-land construction system comprises a mobile steel platform, a slurry mixing background and a marine steel platform; the offshore steel platform is paved in a construction area of the stirring pile, and a steel platform rail is paved above the offshore steel platform along the longitudinal direction or the transverse direction of the offshore steel platform; the movable steel platform is arranged above the offshore steel platform, can longitudinally move along a rail of the steel platform and is fixed, and pile driver equipment is arranged above the movable steel platform and is used for constructing cement mixing piles; the slurry mixing background is fixedly arranged on the sea adjacent to the construction area and is used for mixing slurry and conveying the mixed slurry to the movable steel platform. The deep pile construction method can finish deep pile construction of more than 15m, the control of pile level precision, pile bottom elevation and pile length is not affected by the tide level, the existing building cannot be impacted, adverse settlement deformation of the existing building is caused, the working efficiency is high, the problem of navigation limitation is avoided, the cost is low, and water traffic cannot be blocked.

Description

An offshore deep mixing pile water-to-land construction system and construction method

Technical field

The present invention relates to the technical field of offshore deep mixing pile construction in situations where navigation is limited and adjacent to existing buildings. In particular, it relates to a water-to-land construction system and construction method for offshore deep mixing piles.

Background technique

At present, a large amount of advanced and efficient useful experience has been accumulated in the field of deep mixing pile construction on water at home and abroad. However, there is still no precedent for the construction of deep mixing piles on water in a "generally restricted space" similar to this project, which belongs to the experience vacuum zone.

At present, the construction of deep mixing piles in offshore projects is mostly carried out by the ship method, that is, large DCM construction ships are used to carry out large-area intelligent operations. However, this construction method usually needs to be implemented in the open sea. Deep mixing pile construction cannot be carried out in "generally restricted spaces" with limited navigation, close to existing buildings and high pile position accuracy requirements, which directly affects The effective implementation of the deep mixing pile construction organization cannot provide a working surface for the subsequent foundation and superstructure in time, resulting in an overall delay in the construction period.

Traditional offshore steel platforms generally build trestles from the shore to the construction area for deep mixing pile construction. Cement can be transferred directly from the shore and water can be diverted to the construction site for mixing and construction. However, the construction of deep mixing piles in a generally restricted space is still difficult. The implementation conditions are not met, so construction is considered to be carried out in the form of a front stage formed by a slurry mixing backstage combined with an offshore steel platform on the water and a mobile mixing pile platform.

The existing construction methods mainly have the following shortcomings:

1. When navigation is restricted, large DCM construction ships cannot enter the construction area to carry out construction due to excessive size and tonnage. Small-tonnage deck cargo ships are used. On the one hand, the ship posture is easily affected by wind and wave surges and cannot guarantee the construction quality of long piles above 10m. On the other hand, On the one hand, the stability of the ship itself is insufficient to ensure the accuracy of the construction pile position; and the ship method construction is limited by the stability of the hull, and the tower and drill pipe are generally not too high, so it is difficult to complete the construction of deep piles above 15m, and the pile length restricted; restricted

2. Due to the influence of the tide level, the deep mixing piles constructed by DCM ships have different pile lengths, making it difficult to accurately control the pile bottom elevation and pile length, and there are potential quality risks;

3. When construction is carried out in close proximity to existing buildings, on the one hand, there is the risk of the ship losing control and hitting the existing building. On the other hand, the wave disturbance and foundation disturbance caused by the large DCM construction ship will cause adverse effects on the existing building. settlement deformation;

4. When using DCM ships for construction, due to the process of anchoring and anchoring during the ship moving and positioning process, a lot of time is wasted, and the construction efficiency cannot meet actual needs.

5. Pipe-sheet composite piles will be constructed in the cement mixing pile grid later, so the pile position control of cement mixing piles is particularly important. It is difficult to meet the design accuracy requirements with traditional construction methods;

6) Setting up a trestle on the shore to the construction area would be too expensive and not economically beneficial. On the other hand, it would block water traffic and interfere with other processes.

Contents of the invention

The purpose of this invention is to: when using the ship method to construct deep mixing piles for offshore projects in the existing technology, it is difficult to complete the construction of piles with a depth of more than 15m, it is difficult to accurately control the pile bottom elevation and pile length due to the influence of tide levels, and it may cause collisions. Risks of buildings, easy to cause unfavorable settlement deformation of existing buildings, low work efficiency caused by anchoring, and limited navigation of large DCM construction ships. When using trestles to construct deep mixing piles for offshore projects in the construction area, there are To solve the problems of high cost and blocking water traffic, an offshore deep mixing pile water-to-land construction system and construction method are provided.

In order to achieve the above objects, the technical solutions adopted by the present invention are:

An offshore deep mixing pile water-to-land construction system includes a mobile steel platform, a slurry mixing backstage and an offshore steel platform;

The offshore steel platform is laid in the construction area of the mixing pile, and steel platform rails are laid along the longitudinal or transverse direction above the offshore steel platform;

The mobile steel platform is set above the offshore steel platform. The mobile steel platform can move and be fixed longitudinally along the rails of the steel platform. There is pile driver equipment above the mobile steel platform. The pile driver equipment is used to construct cement mixing piles;

The slurry mixing backstage is fixed on the sea adjacent to the construction area. The slurry mixing backstage is used for mixing slurry and delivering the mixed slurry to the mobile steel platform.

In this plan, the construction area refers to the area covered by the mixing pile construction. The offshore steel platform is laid in the construction area, which can cover the construction area and be fixed in the construction area. Therefore, the longitudinal direction of the construction area and the offshore steel platform are consistent. The steel platform rails are arranged longitudinally or transversely on the steel platform along the seacoast, which determines the movement direction of the mobile steel platform on the offshore steel platform and also determines the construction direction of the mixing piles. For example: when the steel platform rails are arranged longitudinally on the steel platform along the seacoast When the time comes, the mobile steel platform moves longitudinally along the steel platform on the seaboard, that is, the construction of the mixing piles is carried out longitudinally one after another on the steel platform on the seaboard. There is pile driver equipment above the mobile steel platform. The pile driver equipment is used to construct cement mixing piles. That is, the pile driver equipment can be fixed on the mobile steel platform and the mobile steel platform is fixed on the offshore steel platform. It can also provide pile driver equipment. On the premise of providing qualified slurry, construct the mixing piles at corresponding locations in the construction area.

For the offshore deep mixing pile water-to-land construction system of this plan, due to limited offshore navigation, the size of the mobile steel platform cannot be made too large. Therefore, it is impossible to provide a storage place for cement tanks and a background mixing area, making it impossible to move the piles. The machine equipment and slurry mixing equipment are all stably installed on the mobile steel platform. If the slurry is mixed on land, the pipe will be easily blocked during the slurry transportation process, and the cost is too high and is not suitable for the construction of cement mixing piles in offshore projects. By setting up the mixing pile separately, The slurry mixing backstage is used to fix the slurry mixing equipment, and the slurry mixing backstage is fixed on the sea adjacent to the construction area. The slurry mixing backstage can provide qualified slurry for the mobile steel platform; while the steel platform rails of the mobile steel platform on the coast are limited Moving and fixing, the mobile steel platform is less likely to lose control and will basically not hit existing buildings uncontrollably, and it can ensure the positioning accuracy and stability when constructing mixing piles, allowing the mobile steel platform to complete high-quality mixing piles Construction, which avoids the inability of large DCM construction ships to enter the construction area due to excessive size and tonnage to carry out construction, and does not cause wave disturbance and foundation disturbance like the ship method, thereby reducing the adverse settlement deformation of existing buildings. . And its stability is high, so the tower and drill pipe can be set higher, making it easier to complete the construction of deep piles of more than 15m; and the height of the mobile steel platform in the sea is controlled by the offshore steel platform, and the height will not change, so that it can be accurately Control the pile bottom elevation and pile length of the mixing pile to improve the quality of the mixing pile; and the pile position of the cement mixing pile is easier to control through the moving steel platform under the guidance of the steel platform rail, making it easier to achieve the design accuracy after the construction of the mixing pile , the pile position is accurate; and there is no process such as anchoring and anchoring in the ship method. The mobile steel platform is directly moved and positioned under the guidance of the steel platform rails, and the construction efficiency is higher; and there is no need to block water traffic like setting up a trestle. Reduce interference with other processes.

Preferably, the offshore steel platform includes several steel platform support piles, several steel platform main beams and several steel platform scissor braces;

The steel platform support piles are evenly spaced horizontally and vertically in the construction area, and the tops of the steel platform support piles are equipped with steel platform pile caps;

The main beam of the steel platform is arranged on the pile cap of the steel platform along the longitudinal pull-through of the construction area, and the rails of the steel platform are arranged on the main beam of the steel platform longitudinally along the main beam of the steel platform;

The steel platform scissors are installed between the tops of two longitudinally adjacent steel platform support piles or between the tops of two transversely adjacent steel platform support piles.

The steel platform support piles are installed in the construction area through pile sinking. The tops are connected through steel platform scissor braces to form a rectangular frame. The steel platform support piles, steel platform scissor braces, etc. cannot occupy the pile positions of the mixing piles. The pile location of the mixing pile is located in a rectangular frame space. The steel platform pile cap facilitates the erection of the steel platform main beam, and the steel platform main beam is used to support the steel platform rails. The steel platform rails in this plan are set up along the longitudinal direction of the construction area, so that the mixing piles are constructed in sequence in the longitudinal direction of the construction area. It is more convenient to arrange the mobile steel platform so that the length of the mobile steel platform will not be set too long or the number of mobile steel platforms will not need to be set too much.

Preferably, the mobile steel platform includes a platform foundation. The mobile platform steel wheels are provided at the bottom of the platform foundation. The mobile platform steel wheels can drive the platform foundation to move longitudinally along the steel platform rails. The platform foundation is also provided with a rail clamp. The rail clamp clamps The platform foundation can be fixed after holding the steel platform rails;

At least two parallel pile driver slide rails are laid above the platform foundation. The longitudinal direction of the pile driver slide rails is perpendicular to the longitudinal direction of the steel platform rails. All pile driver slide rails are jointly slidably connected to a pile driver base. The top of the pile driver base is close to the platform foundation. Pile driver equipment is fixed on one side of the edge. The pile driver equipment includes a vertical tower. The bottom of the tower is connected to the pile driver base. The upper part of the tower is connected to the pile driver base through the pile driver legs on the side away from the edge of the platform foundation. , a power head is installed on the top of the tower, and a vertical drill pipe is connected to the lower end of the power head;

The side of the platform foundation away from the pile driver equipment is equipped with electrical equipment, which is used to power the pile driver equipment.

The tower, pile driver base and pile driver legs are used to ensure the stability of the drill pipe of the pile driver equipment when constructing the mixing pile. By arranging the pile driver equipment on one side of the platform foundation and the power equipment on the other side of the pile driver equipment, the impact of the pile driver equipment on the corresponding side of the platform foundation can be balanced to ensure the stability of the mobile steel platform when constructing mixing piles. sex. When the amount of reinforcement is large and the construction time is short, the efficiency of traditional construction methods cannot meet the requirements; this plan sets pile driver slide rails on the platform foundation and fixes the pile driver equipment above the pile driver base close to the platform foundation. One side of the edge is fixed to facilitate the construction of the mixing pile on the corresponding side, and the pile driver base can be moved along the pile driver slide rail to drive the pile driver equipment to move along the rails perpendicular to the steel platform, thereby changing the position of the pile driver equipment on the platform foundation to facilitate Adjusting the drill rod of the pile driver equipment is used to adjust the alignment of the mixing piles that need to be constructed. It can be used to align different mixing piles without moving the platform foundation, reducing the movement of the platform foundation and improving the overall construction of the mixing piles. efficiency and construction quality, thereby shortening construction time and meeting efficiency requirements.

Preferably, the grout mixing backstage is equipped with a cement tank, an automatic mixer, a first grout storage tank and a first grouting pump. The cement tank is located in the middle of the grout mixing backstage, and the first grout storage tank and the first grouting pump are located behind the grout mixing backstage. The side of the slurry backstage close to the construction area;

The mobile steel platform is provided with a second grouting tank and a second grouting pump. The first grouting pump connects the first grouting tank and the second grouting tank through the first grouting pipe. The second grouting pump passes through the second grouting pipe. The slurry delivery pipe connects the second slurry storage tank and the pile driver equipment, and both the first slurry delivery pipe and the second slurry delivery pipe are lengthy;

The automatic mixer receives the cement from the cement tank and mixes it for the first time and then transports it to the first slurry storage tank. The first slurry storage tank pumps the mixed slurry to the second slurry storage tank through the first grouting pump. The slurry storage tank can perform secondary stirring of the slurry, and the second slurry storage tank pumps the secondary stirred slurry to the pile driver equipment through the second grouting pump.

Using the above solution, the cement tank is located in the middle of the grouting backstage to store cement and ensure the stability of the center of gravity of the grouting backstage; the first grouting storage tank and the first grouting pump are located near the construction area behind the grouting backstage. side to facilitate pumping slurry to the mobile steel platform; both the first slurry delivery pipe and the second slurry delivery pipe are long, firstly, to meet the impact of seawater fluctuations on the first slurry delivery pipe and the second slurry delivery pipe, and to avoid the first slurry delivery pipe. The slurry pipe and the second slurry feeding pipe were damaged due to pulling, which caused the slurry to be unable to be supplied to the pile driver equipment normally, so as to avoid affecting the continuous construction of the mixing piles. Secondly, it can meet the slurry supply after the mobile steel platform is moved, so that the mobile steel platform can also be supplied after the mobile steel platform is moved. Able to construct mixing piles to avoid affecting the continuous construction of mixing piles.

Cement mixing piles have high requirements for construction continuity, so slurry mixing, grouting, and grouting cannot be stopped unless necessary. Using the above arrangement can ensure the continuity of the mixing piles constructed on the mobile steel platform, and at the same time, the second storage The slurry tank can perform secondary stirring of the slurry, further ensuring the quality of the slurry supplied to the pile driver equipment, and making the construction quality of the mixing piles better.

Preferably, there are at least two cement tanks in the slurry mixing backstage. The two cement tanks are symmetrically located in the middle of the slurry mixing backstage to ensure that the center of gravity of the slurry mixing backstage is stable and the space is small. The two cement tanks complement each other and fully Ensure the supply of cement and avoid interruption of slurry supply due to cement material breakage, which will affect the pile quality of the mixing pile.

Preferably, the grout mixing background includes a number of steel pipe piles. The steel pipe piles are sunk and anchored on the seabed, and the top surfaces of the steel pipe piles are higher than the sea level. The tops of all steel pipe piles are welded with pile top cover plates, and the pile top cover plates are erected and fully covered. A double I-beam main beam is welded, a number of I-beam secondary beams are welded at intervals above the double I-beam main beam, and the top of the I-beam secondary beams is covered with steel plates;

A fixed rope is wrapped around the cement tank and connected to the steel pipe pile.

The grout mixing backstage adopts the above-mentioned structure, which is stable in structure, facilitates grout mixing operations on the grout mixing backstage, provides a stable slurry supply for the mobile steel platform, and the construction is relatively simple. The cement tank at the backstage of the grout mixing can be pulled to the bottom steel pipe pile through a fixed rope and fixed to form a windproof cable to achieve the anti-typhoon reinforcement effect. It can not only fix the upper cement tank through the grouting backstage, but also assist in fixing the mixer through the upper cement tank. The slurry backstage forms mutual fixation and improves stability.

Preferably, it also includes a cement supply ship, which is used to transport cement to the cement tanks at the backstage of the slurry mixing;

There is a protective structure on the side of the grout mixing backstage away from the construction area. The protective structure includes at least two clusters of protective components composed of three anti-collision piles;

The three anti-collision piles of each protective component are arranged in an equilateral triangle, with horizontal supports between adjacent anti-collision piles. One of the anti-collision piles is set away from the grout mixing backstage, and the remaining two anti-collision piles are in contact with the grout mixing backstage. The spacing is equal, and there are rubber fenders on the outside of the anti-collision piles set away from the slurry mixing background.

The cement supply ship transports cement to the cement tanks at the slurry mixing backstage to ensure sufficient material; and when the cement supply ship transports cement to the slurry mixing backstage, it may collide with the slurry mixing backstage, and the slurry mixing backstage is an independent beam, plate and column structure, facing Frequent collisions of the cement supply ship will affect the stability. This plan sets up a protective structure to protect the slurry mixing backstage to avoid direct collision between the cement supply ship and the slurry mixing backstage, thereby ensuring the stability of the slurry mixing backstage. The three anti-collision piles of each protective component are arranged in an equilateral triangle, which can ensure the stability of the protective component; one of the anti-collision piles is set away from the grout mixing backstage, and the remaining two anti-collision piles are equally spaced from the grout mixing backend, and The protective structure includes at least two clusters of protective components composed of three anti-collision piles, which can facilitate the docking of cement supply ships; and there are rubber fenders on the outside of the anti-collision piles set far away from the slurry mixing background, which can play a buffering role and weaken the cement. The collision energy of the supply ship's anti-collision piles reduces the interference to the stability of the slurry mixing backstage.

Preferably, several slurry mixing backstages are provided at intervals along the longitudinal direction of the construction area, and three mobile steel platforms are provided along the transverse direction of the construction area. The three mobile steel platforms are distributed in a shape on the offshore steel platform, and all the pile drivers The equipment faces the same direction and is the longitudinal direction of the offshore steel platform. The slurry mixing backstage close to the municipal water intake point is directly connected through a water pipe. The water pipe is lengthy. All mobile steel platforms are supplied with slurry through the same similar slurry mixing backstage.

The water pipe is long and meets the conditions of offshore stress and avoids damage due to pulling. When the designer strictly requires municipal water to be used for mixing grout, water pipe planning and layout problems will arise. In this plan, three mobile steel platforms are set up along the transverse direction of the construction area, that is, the three mobile steel platforms all move longitudinally along the construction area, and the three mobile steel platforms are distributed in a shape on the offshore steel platform. All the above mentioned The pile driver equipment is oriented in the same direction and is in the longitudinal direction of the offshore steel platform. Therefore, the three mobile steel platforms can construct mixing piles at different positions at the same time without interfering with each other. They can operate at multiple points along the longitudinal direction of the construction area at the same time, which can improve construction efficiency. And it can complete the construction and move synchronously, so that all mobile steel platforms can supply slurry through the same similar grout mixing backend. When all mobile steel platforms arrive somewhere in the construction area, they will provide slurry through the corresponding grout mixing backend. , so it is only necessary to connect the slurry mixing backstage there to the nearby municipal water intake point directly through the water pipe, which can reduce the difficulty of laying out various pipelines, making it easier for each slurry mixing backstage to obtain municipal water, and thus Improve the quality of the slurry and improve the quality of the mixing pile.

A construction method of water-to-land transfer of deep offshore mixing piles, using the above-mentioned offshore deep mixing pile water-to-land construction system to construct the mixing piles, including the following steps:

S1. Install the offshore deep mixing pile water-to-land construction system so that the slurry mixing backstage can meet the slurry mixing conditions and can deliver the mixed slurry to the mobile steel platform, and enable the mobile steel platform to move along the steel platform rails on the coastal steel platform. And fixed, the pile driver equipment on the mobile steel platform can move along the pile driver slide rail perpendicular to the steel platform rail along the edge of the mobile steel platform;

S2. The construction personnel adjust the position of the pile driver equipment so that the center of the drill pipe of the pile driver equipment is aligned with the pile position of one group of mixing piles in one row, and fix the pile driver equipment and the mobile steel platform;

S3. Check the verticality of the drill pipe. If the verticality deviation of the drill pipe exceeds the allowable value, adjust the verticality of the drill pipe by raising or lowering the pile driver legs of the tower of the pile driver equipment so that the verticality of the drill pipe The verticality deviation is within the allowable value range;

S4. Through the grout mixing backend, start adding water and mixing grout according to the mix ratio. After the cement slurry is obtained and passes the test, it passes through the first grouting pump in the grout mixing backend and delivers the grout to the third grouting pipe of the mobile steel platform. In the second slurry storage tank;

S5. Start the generator on the mobile steel platform and turn on the motor of the second slurry storage tank to stir the slurry a second time;

S6. Turn on the winch and power head of the pile driver equipment, and start the second grouting pump on the mobile steel platform to deliver slurry to the drill pipe of the pile driver equipment. The drill pipe begins to rotate and drill down the mixing piles until the group of mixing piles in the row. After the construction is completed, the drill pipe is lifted to the water surface at an even speed by the reversing winch;

S7. With the help of the pile driver slide rail on the moving steel platform, adjust the position of the pile driver equipment longitudinally along the pile driver slide rail so that the next group of mixing piles in the row can be repositioned, and then repeat step S6 to complete the next set of the row. Construction of a group of mixing piles;

S8. Repeat step S7 until the construction of all groups of mixing piles in the row is completed;

S9. Raise the power head to the 0 scale, then release the fixation of the mobile steel platform, control the mobile steel platform to move longitudinally on the steel platform rail until the center of the drill pipe is aligned with the central axis of the next row of mixing piles, and repeat steps S2-S8. Until the construction of the next row of mixing piles is completed;

S10. Repeat step S9 until the construction of all rows of mixing piles is completed.

In this plan, the construction area is divided into several rows of mixing pile construction areas longitudinally or transversely, and each row of mixing piles has several groups along its longitudinal direction. The mobile steel platform is positioned on the steel platform rail above the offshore steel platform so that the center of the drill pipe of the pile driver equipment above the mobile steel platform corresponds to the center of a group of mixing piles in one row. The mobile steel platform is moved along the pile driver slide rail. The pile driver equipment on the machine can be adjusted to correspond to different groups of mixing piles in the row, and construction is generally carried out from one side of the construction area to the other side. That is, one group of mixing piles in one row is constructed first, and then by moving the pile driver equipment along the pile driver slide rail, other groups of mixing piles in the row can be constructed. After the construction of the row is completed, the piles can be installed on the steel platform rails. Move the mobile steel platform to the position of the next row of mixing piles, and then construct the next row of mixing piles until the construction is completed.

The offshore deep mixing pile water-to-land construction method described in this plan uses the offshore steel platform to stably cover the construction area on the sea as the construction platform, making it possible to use the steel platform rails on the offshore steel platform and the pile driver slide rails of the mobile steel platform to The adjustment allows the drill pipe of the pile driver equipment to be positioned and fixed with different mixing piles, making the entire positioning and anchoring process more convenient, and the construction is orderly, which can ensure the continuity during the construction of the mixing piles, and can greatly improve the construction efficiency, more accurate positioning and better stability during construction, making the construction of mixing piles of higher quality and construction safer.

Preferably, in step S1, make the longitudinal direction of the steel platform rails perpendicular to the line connecting the pile center of each row of mixing piles, and make the pile driver slide rail parallel to the line connecting the center of the piles of each row of mixing piles, and make the steel platform The rails are marked by spraying standard fluorescent scale lines, and vertical hanging pins are set at the bottom of the moving steel platform;

In step S2, move the mobile steel platform to the bottom of the suspended needle and move it above the corresponding scale line so that the center of the drill pipe basically coincides with the center of the mixing pile. Then recheck the drill pipe offset. If the drill pipe is offset If the position exceeds the allowable deviation, fine-tune the mobile steel platform so that the center of the drill pipe coincides with the center of the mixing pile and then fix it immediately.

Using the above method, the center position of the drill pipe and the pile position center of the mixing pile can be more quickly coincided, ensuring the positioning effect, improving the construction efficiency and construction quality of the mixing pile, and making the pile position control effect of the cement mixing pile after construction better. Good, meeting the design accuracy.

In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

1. The offshore deep mixing pile water-to-land construction system of the present invention uses a separate grout mixing backstage to fix the grouting equipment, and the grouting backstage is fixed on the sea adjacent to the construction area, and the grouting backstage can be moved. The steel platform provides qualified slurry; while the mobile steel platform moves and is fixed under the constraints of the steel platform rails on the coastal steel platform. The mobile steel platform is less likely to lose control and will basically not hit existing buildings uncontrollably, and its construction can be guaranteed The positioning accuracy and stability when mixing the piles enable the mobile steel platform to complete the high-quality construction of the mixing piles. It avoids the inability of large DCM construction ships to enter the construction area due to excessive size and tonnage to carry out construction, and it will not be like the ship method. It brings wave disturbance and foundation disturbance, which can reduce the adverse settlement deformation of existing buildings. And its stability is high, so the tower and drill pipe can be set higher, making it easier to complete the construction of deep piles of more than 15m; and the height of the mobile steel platform in the sea is controlled by the offshore steel platform, and the height will not change, so that it can be accurately Control the pile bottom elevation and pile length of the mixing pile to improve the quality of the mixing pile; and the pile position of the cement mixing pile is easier to control through the moving steel platform under the guidance of the steel platform rail, making it easier to achieve the design accuracy after the construction of the mixing pile ; And there is no process such as anchoring and anchoring in the ship method. The mobile steel platform is directly moved and positioned under the guidance of the steel platform rails, and the construction efficiency is higher; and there is no need to block water traffic like setting up a trestle, reducing the impact on other processes. interference.

2. The offshore deep mixing pile water-to-land construction method of the present invention uses the offshore steel platform to stably cover the construction area on the sea as the construction platform, so that the steel platform rails on the offshore steel platform and the pile driver slide of the mobile steel platform can be used. The rails are adjusted to position and fix the drill pipe of the pile driver equipment with different mixing piles, making the entire positioning and anchoring process more convenient, and the construction is orderly, which can ensure the continuity during the construction of the mixing piles, and can greatly improve The construction efficiency is improved, and the positioning during construction is more accurate and stable, making the construction of mixing piles of higher quality and construction safer.

Description of the drawings

Figure 1 is a schematic structural diagram of the offshore deep mixing pile water-to-land construction system described in Embodiment 1;

Figure 2 is a schematic diagram of the plane layout of the mobile steel platform;

Figure 3 is a schematic diagram of the layout of the mobile steel platform on the offshore steel platform;

Figure 4 is a longitudinal schematic diagram of the mobile steel platform on the offshore steel platform;

Figure 5 is an enlarged schematic diagram of the circle in Figure 4;

Figure 6 is a lateral schematic diagram of the mobile steel platform on the offshore steel platform;

Figure 7 is an enlarged schematic diagram of the circle in Figure 6;

Figure 8 is a schematic structural diagram of the pulp mixing backstage.

Icon: 1-Mobile steel platform; 2-Pile driver slide rail; 3-Pile driver base; 4-Tower; 5-Pile driver legs; 6-Power head; 7-Drill pipe; 8-Oil storage tank; 9 -Generator; 10-Distribution box; 11-Second grout storage tank; 12-Second grouting pump; 13-Steel platform support piles; 14-Steel platform main beam; 15-Steel platform rails; 16-Steel platform Scissor support; 17-steel platform pile cap; 18-mobile platform steel wheel; 19-slurry mixing backstage; 20-steel pipe pile; 21-cement tank; 22-unloading system; 23-first slurry storage tank; 24- The first grouting pump; 25-backstage oil storage tank; 26-backstage generator; 27-backstage distribution box; 28-anti-collision pile; 29-marine naval anchor; 30-first slurry delivery pipe; 31-cement supply Boat; 32-Water pipe; 33-Municipal water intake point; 34-Construction area; 35-Existing buildings across the sea; 36-Coastline.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

Example 1

This embodiment provides an offshore deep mixing pile water-to-land construction system, see Figure 1 , including a mobile steel platform 1, a slurry mixing backstage 19 and an offshore steel platform;

The offshore steel platform is laid in the construction area 34 of the mixing pile, and steel platform rails 15 are laid longitudinally or transversely above the offshore steel platform;

The mobile steel platform 1 is arranged above the offshore steel platform. The mobile steel platform 1 can move and be fixed longitudinally along the steel platform rail 15. There is a pile driver equipment above the mobile steel platform 1. The pile driver equipment is used for constructing cement mixing piles;

The slurry mixing backstage 19 is fixed on the sea adjacent to the construction area 34. The slurry mixing backstage 19 is used for mixing slurry and transporting the mixed slurry to the mobile steel platform 1.

In this plan, the construction area 34 refers to the area covered by the mixing pile construction. As shown in Figure 1, part of the construction area 34 is shown. The left and right directions are longitudinal, the upper and lower directions are transverse, and there is a coastline on the upper side of the construction area 34. 36. There is a municipal water intake point 33 on the coastline 36 side, and there are existing cross-sea buildings 35, such as cross-sea bridges, on the lower side of the construction area 34. The offshore steel platform is laid in the construction area 34, can cover the construction area 34 and is fixed at the construction area 34, so the longitudinal direction of the construction area 34 and the offshore steel platform are consistent. The steel platform rails 15 are arranged longitudinally or transversely on the offshore steel platform, which determines the moving direction of the mobile steel platform 1 on the offshore steel platform, and also determines the construction direction of the mixing piles. For example: when the steel platform rails 15 are on the coastal steel platform When arranged longitudinally, the mobile steel platform 1 moves longitudinally along the steel platform along the seaboard, that is, the construction of the mixing piles is carried out longitudinally one after another along the steel platform along the seaboard, that is, in the left and right directions; when the steel platform rails 15 are arranged transversely along the steel platform along the seaboard , the construction of mixing piles is carried out laterally on the steel platform along the coast, that is, in the upper and lower directions. There is pile driver equipment above the mobile steel platform 1. The pile driver equipment is used for constructing cement mixing piles. That is, the pile driver equipment can be fixed on the mobile steel platform 1 and the mobile steel platform 1 is fixed on the offshore steel platform. On the premise that the pile driver equipment provides qualified slurry, the mixing piles at the corresponding positions in the construction area 34 are constructed.

In Figure 1, it can be seen that the slurry mixing backstage 19 is fixed on the sea adjacent to the construction area 34, and is fixed on the side of the construction area 34 close to the coastline 36. The slurry mixing backstage 19 is connected to the adjacent municipal water intake point 33 through the water pipe 32. At the same time, there is a cement supply ship 31 that can continuously transport cement for the slurry mixing backend 19, so that continuous municipal water can be used for mixing cement slurry. The side of the slurry mixing backstage 19 close to the construction area 34 provides the mobile steel platform 1 with stirred slurry through the first slurry supply pipe 30, so that the pile driver equipment of the mobile steel platform 1 can use the slurry to construct the mixing piles.

In this embodiment, a number of grouting backstages 19 are provided at intervals along the longitudinal direction of the construction area 34 . The entire grouting backstage 19 is not shown in FIG. 1 , only one grouting backstage 19 is shown. As shown in Figures 1 and 3, three mobile steel platforms 1 are provided along the transverse direction of the construction area 34, that is, the three mobile steel platforms 1 all move longitudinally along the construction area 34, and the three mobile steel platforms 1 are on the offshore steel platform. Distributed in a rectangular shape, all the pile driver equipment is oriented in the same direction and is the longitudinal direction of the offshore steel platform. Therefore, the three mobile steel platforms 1 can construct mixing piles at different positions at the same time without interfering with each other, and can move along the construction area 34 Simultaneous operation at multiple points longitudinally can improve construction efficiency. And the construction can be completed synchronously, such as moving to the right synchronously, so that all mobile steel platforms 1 can supply slurry through the same similar slurry mixing backend 19. When all mobile steel platforms 1 arrive somewhere in the construction area 34, all mobile steel platforms 1 1. The slurry is supplied through the same similar slurry mixing backstage 19, that is, the slurry is provided through the corresponding slurry mixing backstage 19. Therefore, it is only necessary to directly connect the slurry mixing backstage 19 there to the nearby municipal water intake point 33 through the water pipe 32. That is, the difficulty of laying various pipelines can be reduced, making it easier for each slurry mixing backstage 19 to obtain municipal water, thereby improving the quality of the slurry and the quality of the mixing piles. The water pipe 32 is long and meets the stress conditions in the sea to avoid damage due to pulling. The above arrangement can solve the problem of water pipe planning and layout when using municipal water for slurry mixing.

As shown in Figure 3-7, the offshore steel platform includes a number of steel platform support piles 13, a number of steel platform main beams 14 and a number of steel platform scissor braces 16; the steel platform support piles 13 are evenly spaced horizontally and vertically in the construction area 34. The tops of the steel platform support piles 13 are provided with steel platform pile caps 17; the steel platform scissor braces 16 are located between the tops of two longitudinally adjacent steel platform support piles 13 or between the tops of two transversely adjacent steel platform support piles 13. between.

The steel platform support piles 13 are installed in the construction area 34 by driving piles, and the tops are connected through the steel platform scissor braces 16 to form a rectangular frame, which will not interfere with the movement of the mobile steel platform 1 or the construction of the mixing piles, and can All the steel platform support piles 13 are connected together to form an overall stress-bearing structure, making the construction of the mixing piles more stable. As shown in Figure 3. Moreover, the steel platform support piles 13, steel platform scissor supports 16, etc. cannot occupy the pile positions of the mixing piles. The pile positions of the mixing piles are located in the rectangular frame space in Figure 3. As shown in Figure 5, the steel platform pile caps 17 facilitate the erection of the steel platform main beams 14. The steel platform main beams 14 are used to support the steel platform rails 15, so they are only stretched along the moving direction of the mobile steel platform 1, as shown in Figure 7 . This embodiment is illustrated by taking the mobile steel platform 1 as a longitudinal steel platform along the coast. The main beams 14 of the steel platform are arranged on the pile caps 17 of the steel platform along the longitudinal direction of the construction area 34. The rails 15 of the steel platform are arranged longitudinally along the main beams 14 of the steel platform. On the main beam 14 of the steel platform, the mixing piles are constructed one after another in the longitudinal direction of the construction area 34, which makes it easier to arrange the mobile steel platform 1 so that the length of the mobile steel platform 1 will not be too long or the number of mobile steel platforms 1 will not be too large. If the mobile steel platform 1 moves laterally along the coastal steel platform, the steel platform main beams 14 are arranged on the steel platform pile caps 17 along the transverse pull-through of the construction area 34, and the steel platform rails 15 are longitudinally arranged on the steel platform along the steel platform main beams 14. On the main beam 14.

As shown in Figure 2-5, this implementation provides a better structure of the mobile steel platform 1. The mobile steel platform 1 includes a platform foundation. The platform foundation is a frame structure formed by two main beams and two secondary beams. The bottom of the foundation It is a moving and braking system formed by four mobile platform steel wheels 18 and rail clamps on each side. One side of the upper part of the foundation is the grouting equipment area, power equipment area and worker operating area, and the other side is the pile driver equipment area. Provide space for pile driver equipment assembly.

Specifically, a number of mobile platform steel wheels 18 are provided at the bottom of the platform foundation. As shown in Figure 2, four mobile platform steel wheels 18 are provided on each side of the upper and lower sides. The mobile platform steel wheels 18 can drive the platform foundation along the longitudinal direction of the steel platform rail 15. Mobile, the bottom of the platform foundation is also equipped with a rail clamp, which can fix the platform foundation after clamping the steel platform rail 15;

In Figure 2, at least two parallel pile driver slide rails 2 are laid above the platform foundation. The longitudinal direction of the pile driver slide rails 2 is perpendicular to the longitudinal direction of the steel platform rail 15, as shown in Figure 7. All pile driver slide rails 2 are slidingly connected to a pile driver base 3. Pile driver equipment is fixed on one side of the pile driver base 3 near the edge of the platform foundation. The pile driver equipment includes a vertically arranged tower 4, and the bottom of the tower 4 Connected to the pile driver base 3, the upper part of the tower 4 is connected to the side of the pile driver base 3 away from the edge of the platform foundation through the pile driver legs 5. A power head 6 is installed on the top of the tower 4, and the lower end of the power head 6 is connected to a vertical The drill rod 7; the tower 4, the pile driver base 3 and the pile driver legs 5 are used to ensure the stability of the drill rod 7 of the pile driver equipment when constructing the mixing pile. The connection height of the pile driver legs 5 can be adjusted. For example, the pile driver legs 5 have a telescopic structure, or can be lengthened or shortened, and can be used to adjust the verticality of the drill pipe 7;

The side of the platform foundation away from the pile driver equipment is equipped with electrical equipment, which is used to power the pile driver equipment. By arranging the pile driver equipment on one side of the platform foundation and arranging the electric equipment on the other side of the pile driver equipment, the impact of the pile driver equipment on the corresponding side of the platform foundation can be balanced, ensuring the safety of the mobile steel platform 1 when constructing mixing piles. stability.

When the amount of reinforcement is large and the construction time is short, the efficiency of traditional construction methods cannot meet the requirements; this plan sets pile driver slide rails 2 on the platform foundation and fixes the pile driver equipment above the pile driver base 3 close to One side of the edge of the platform foundation is fixed to facilitate the construction of the mixing pile on the corresponding side, and the pile driver base 3 can be moved along the pile driver slide rail 2 to drive the pile driver equipment to move along the rail 15 perpendicular to the steel platform, thereby changing the position of the pile driver equipment on the platform foundation. The position above is convenient for adjusting the drill pipe 7 of the pile driver equipment. It is used to adjust the alignment of the mixing piles that need to be constructed. It can be used to align different mixing piles without moving the platform foundation to reduce the movement of the platform foundation. Improve the overall construction efficiency and construction quality of mixing piles, thereby shortening the construction time and meeting efficiency requirements.

As shown in Figure 2, the pile driver slide rail 2 and pile driver equipment are arranged on the right side. The drill pipe 7 of the pile driver equipment is used to construct the mixing pile on the right side. The pile driver equipment can move along the upper and lower sides to drive the drill pipe 7 up and down. Side movement can correspond to different mixing pile positions. Two distribution boxes 10 are arranged on the upper left side, and a generator 9 is arranged on the middle upper side of the two distribution boxes 10, forming a Z-shaped arrangement; two second grouting pumps 12 are arranged on the lower left side, and two second grouting pumps 12 are arranged on the lower left side. There is an oil storage tank 8 on the middle lower side of the pump 12, forming an inverted font shape. The two font shapes are symmetrically arranged, and there is a second slurry storage tank 11 between the two font shapes. Through this arrangement, the left and right sides can be Side balance, upper and lower sides balance to ensure the stability of the mobile steel platform 1. And the two second grouting pumps 12 can pump slurry to the two pile driver equipments arranged on the right side respectively.

As shown in Figures 1 and 8, this embodiment also provides a better grout mixing backstage 19, which is provided with a cement tank 21, an automatic mixer, a first grout storage tank 23 and a first grouting Pump 24. The cement tank 21 is located in the middle of the grout mixing backstage 19 and is used to store cement and ensure the stability of the center of gravity of the grout mixing backstage 19 . As shown in Figure 8, the grout mixing backstage 19 is provided with at least two cement tanks 21. The two cement tanks 21 are symmetrically located in the middle of the grout mixing backstage 19 to ensure that the center of gravity of the grout mixing backstage 19 is stable and the space occupied is small. The two cement tanks 21 complement each other to fully ensure cement supply and avoid interruption of slurry supply caused by cement material breakage, which affects the quality of the mixing pile. Moreover, two unloading systems 22 are symmetrically arranged between the two cement tanks 21 . Each unloading system 22 corresponds to a cement tank 21 . The unloading system 22 is located away from the construction area 34 .

The first grout storage tank 23 and the first grouting pump 24 are located on the side of the grout mixing backstage 19 close to the construction area 34 to facilitate pumping grout to the mobile steel platform 1 . In Figure 8, there are two first grouting pumps 24 and one first grout storage tank 23. The two first grouting pumps 24 are symmetrically arranged with respect to the first grout storage tank 23 in the left and right direction of the grout mixing backstage 19. In addition, a backstage oil storage tank 25 is provided in the lower right corner of the slurry mixing backstage 19, and a backstage generator 26 is provided in the upper right corner to ensure balance between the upper and lower sides. Two backend distribution boxes 27 are provided on the upper side of the first slurry storage tank 23 located on the left side.

The mobile steel platform 1 is provided with a second grout storage tank 11 and a second grouting pump 12. The first grouting pump 24 communicates with the first grout storage tank 23 and the second grout storage tank 11 through the first grout delivery pipe 30. The grouting pump 12 is connected to the second grout storage tank 11 and the pile driver equipment through the second grout delivery pipe. Both the first grout delivery pipe 30 and the second grout delivery pipe are lengthy. First, the impact of sea water fluctuations on the first grout delivery pipe 30 can be satisfied. and the second slurry feeding pipe, to avoid the first slurry feeding pipe 30 and the second slurry feeding pipe being damaged due to pulling, causing the slurry to be unable to be supplied to the pile driver equipment normally, and to avoid affecting the continuous construction of the mixing piles. Secondly, it can meet the needs of mobile steel pipes. The slurry supply after the platform 1 is moved enables the construction of mixing piles after the mobile steel platform 1 is moved, so as to avoid affecting the continuous construction of the mixing piles.

The automatic mixer receives the cement from the cement tank 21 for the first time and then delivers it to the first slurry storage tank 23. The first slurry storage tank 23 pumps the mixed slurry to the second slurry storage through the first grouting pump 24. The second grout storage tank 11 can perform secondary stirring of the slurry, and the second grout storage tank 11 pumps the secondary stirred slurry to the pile driver equipment through the second grouting pump 12 . Cement mixing piles have high requirements for construction continuity, so slurry mixing, grouting, and grouting cannot be stopped unless necessary. Using the above arrangement can ensure the continuity of the construction mixing piles on the mobile steel platform 1, and at the same time, the second The slurry storage tank 11 can perform secondary stirring of the slurry, further ensuring the quality of the slurry supplied to the pile driver equipment, and making the construction quality of the mixing pile better.

In this embodiment, the grout mixing backstage 19 includes a number of steel pipe piles 20. The steel pipe piles 20 are sunk and anchored on the seabed. The top surfaces of the steel pipe piles 20 are higher than the sea level. The tops of all the steel pipe piles 20 are welded with pile top covers. A double I-beam main beam is erected and fully welded on the top cover. A number of I-beam secondary beams are welded at intervals above the double I-beam main beam. The top of the I-beam secondary beams are covered with steel plates; the grout mixing backstage 19 adopts The above-mentioned structure has a stable structure, is conducive to slurry mixing operations on the slurry mixing backstage 19, provides a stable slurry supply for the mobile steel platform 1, and is relatively simple to construct.

The cement tank 21 is wrapped with a fixed rope, and the fixed rope is connected to the steel pipe pile 20 . That is, the cement tank 21 in the slurry mixing backstage 19 can be pulled to the bottom steel pipe pile 20 through a fixed rope and fixed to form a windproof cable to achieve the anti-typhoon reinforcement effect. The upper cement tank 21 can be fixed through the slurry mixing backstage 19 and can also be fixed through the upper cement tank 21. The cement tank 21 assists in fixing the slurry mixing backstage 19 to form mutual fixation and improve stability.

A protective structure is provided on the side of the grout mixing backstage 19 away from the construction area 34. The protective structure includes at least two clusters of protective components composed of three anti-collision piles 28;

The three anti-collision piles 28 of each protective component are arranged in an equilateral triangle, and horizontal supports are provided between adjacent anti-collision piles 28. One of the anti-collision piles 28 is set away from the grout mixing backstage 19, and the remaining two anti-collision piles 28 The distance between the backstage 19 and the backstage 19 is equal, and the anti-collision piles 28 arranged away from the backstage 19 are provided with rubber fenders. The cement supply ship 31 transports cement to the cement tank 21 in the slurry mixing backstage 19 to ensure sufficient material; and the cement supply ship 31 transports cement to the slurry mixing backstage 19, and may collide with the slurry mixing backstage 19, and the slurry mixing backstage 19 is independent The beam-plate-column structure faces frequent collisions with the cement supply ship 31, and its stability will be affected. In this plan, a protective structure is set up to protect the grout mixing backstage 19 and avoid direct collision between the cement supply ship 31 and the grout mixing backstage 19. This ensures the stability of the slurry mixing backstage 19. The three anti-collision piles 28 of each protective component are arranged in an equilateral triangle shape and are connected together through horizontal connections in the middle, which can ensure the stability of the protective component; one of the anti-collision piles 28 is set away from the grout mixing backstage 19, and the remaining two The anti-collision piles 28 are equally spaced from the slurry mixing backstage 19, and the protective structure includes at least two clusters of protective components composed of three anti-collision piles 28, which can facilitate the docking of the cement supply ship 31; The outside of the collision pile 28 is provided with a rubber fender, which can play a buffering role, weaken the collision energy of the cement supply ship 31 anti-collision pile 28, and reduce the interference to the stability of the slurry mixing backstage 19.

In the offshore deep mixing pile water-to-land construction system described in this embodiment, due to limited offshore navigation, the size of the mobile steel platform 1 cannot be made too large, so it cannot provide a storage place for the cement tank 21 and a backstage slurry mixing area. , making it impossible to stably install the pile driver equipment and grout mixing equipment on the mobile steel platform 1. If onshore grout mixing is used, the pipe will be easily blocked during the grout transport process, and the cost is too high and is not suitable for cement mixing piles in offshore projects. During construction, the grouting backstage 19 is separately set up to fix the grouting equipment, and the grouting backstage 19 is fixed on the sea adjacent to the construction area 34. The grouting backstage 19 can provide qualified grout for the mobile steel platform 1; and the mobile steel platform The platform 1 moves and is fixed under the restrictions of the steel platform rails 15 of the steel platform on the coast. The possibility of losing control of the mobile steel platform 1 is small, and it will basically not hit the existing buildings uncontrollably, and it can ensure the positioning accuracy and accuracy when constructing the mixing pile. The stability enables the mobile steel platform 1 to complete the high-quality construction of mixing piles. It avoids the inability of large DCM construction ships to enter the construction area due to excessive size and tonnage, and does not cause wave disturbance and foundation like the ship method. Disturbance can thereby reduce the unfavorable settlement deformation of existing buildings. And its stability is high, so the tower 4 and drill pipe 7 can be set higher, making it easier to complete the construction of deep piles of more than 15m; and the height of the mobile steel platform 1 in the sea is controlled by the offshore steel platform, and the height will not change. Thus, the pile bottom elevation and pile length of the mixing pile can be accurately controlled, improving the quality of the mixing pile; and the pile position of the cement mixing pile is easier to control under the guidance of the steel platform rail 15 through the moving steel platform 1, making it easier to control the mixing pile after construction. It is easier to achieve design accuracy; and there is no process such as anchoring and anchoring in the ship method. The mobile steel platform 1 is directly moved and positioned under the guidance of the steel platform rails 15, and the construction efficiency is higher; and there is no need to block it like setting up a trestle. Water transportation reduces interference to other processes.

Example 2

This embodiment provides a water-to-land construction method for offshore deep mixing piles, which is characterized in that the offshore deep mixing pile water-to-land construction system with only one mobile steel platform 1 as described in Embodiment 1 is used to construct the mixing piles, including Following steps:

S1. Install the offshore deep mixing pile water-to-land construction system so that the slurry mixing backend 19 can meet the slurry mixing conditions and can deliver the mixed slurry to the mobile steel platform 1, and enable the mobile steel platform 1 to move the steel on the steel platform along the coast. The platform rail 15 is moved and fixed, and the pile driver equipment on the mobile steel platform 1 can move along the pile driver slide rail 2 perpendicular to the steel platform rail 15 along the edge of the mobile steel platform 1;

In this embodiment, on the one hand, the mobile steel platform 1 needs to meet the requirements for walking on the offshore steel platform, and on the other hand, it needs to brake immediately in an emergency to ensure safety and the stability of the mixing pile position.

The platform foundation is a frame structure formed by two main beams and two secondary beams. The bottom of the foundation is a moving and braking system formed by four mobile platform steel wheels 18 and rail clamps on each side. The upper side of the foundation is grouting There are equipment area, power equipment area and worker operation area. The other side is the pile driver equipment area, which provides space for pile driver equipment assembly.

The pile driver equipment includes pile driver slide rails 2, pile driver base 3, tower 4, pile driver legs 5, power head 6, drill pipe 7, etc.; two pile driver slide rails 2 are placed in parallel in the pile driver equipment area. The front and rear sides of the machine base 3 are stuck on two pile driver slide rails 2 and moved left and right through wire rope pulling. The pile driver equipment is placed on the edge side of the pile driver base 3; the power system includes an oil storage tank 8, an oil pipeline, a generator 9, The distribution box 10 and various distribution lines provide power for the entire construction process. The grouting system includes a second grout storage tank 11, a second grouting pump 12, a second grout pipe, a grouting port, etc., through the second The grouting pump 12 realizes the function of grouting into the soil.

The assembly method of offshore steel platform is as follows:

The erection of the offshore steel platform includes the process of sinking the steel platform support piles 13, cutting the pile heads to make the steel platform pile caps 17, installing the horizontal and vertical steel platform scissor braces 16, and erecting the steel platform main beams 14 and steel platform rails 15;

Specifically, it includes the following steps:

A1. Measure and stake out the 13 pile positions of the steel platform support piles of the offshore steel platform;

A2. Hang the piles and drive the steel platform support piles 13 to complete the pile sinking construction;

A3. Cut off the pile head part according to the specified elevation;

A4. Make sure the pile tops are flush and then make steel platform pile caps 17;

A5, cycle steps A1 to A4 to complete the construction of all steel platform support piles 13 in the first section;

A6. Install the longitudinal and transverse steel platform scissor braces 16 of the first offshore steel platform;

A7. Measure and stake out the axis position of the main beam 14 of the steel platform on top of the pile and the steel platform rail 15;

A8. Hoist the main beam 14 of the rectangular square tube steel platform and reinforce it;

A9. Lay the steel platform rail 15 on the axis above the main beam 14 of the steel platform and reinforce it with a rail press to ensure that the rail center line is smooth and straight without any staggered seams;

A10. Repeat steps A5 to A9 until the installation of all horizontal and vertical steel platform scissor braces 16, steel platform main beams 14 and steel platform rails 15 is completed.

The assembly method of the mixing backstage 19 is as follows:

The deep mixing pile slurry mixing backstage 19 adopts the method of setting up a water steel platform immediately adjacent to the construction area 34, and arranges a cement tank 21, a lower auger and a weighing system, an automatic slurry mixing machine, and a second slurry storage tank 11 above the platform. The second grouting pump 12, oil storage tank 8, generator 9, distribution box 10 and other equipment realize the function of mixing grout on the offshore platform and delivering grout to the front desk of the deep mixing pile mobile steel platform 1.

The assembly method of the mixing backstage 19 is as follows:

The cement mixing pile slurry mixing backstage 19 adopts the method of setting up a water steel platform at the position 34 immediately adjacent to the construction area, and arranges a cement tank 21, a loading system 22 composed of a lower auger and a weighing system, an automatic slurry mixing machine, and a cement tank 21 above the platform. A slurry storage tank 23, a first grouting pump 24, a background generator 26, a background oil storage tank 25, a background distribution box 27 and other equipment, thereby realizing the mixing of slurry on the offshore platform and delivering slurry to the front of the cement mixing pile mobile steel platform 1 function.

The assembly of the mixing backstage 19 specifically includes the following steps:

B1. Measure and stake out the 20 steel pipe piles required for erecting the steel platform;

B2. Steel pipe piles 20 and anti-collision piles 28 are constructed and cut to a uniform elevation and then the pile top cover is welded;

B3. Erect the double I-beam main beam and perform full welding reinforcement;

B4. Arrange I-beam secondary beams at equal intervals above the main beam and reinforce them;

B5. After covering the secondary beams with steel plates, guardrails, ladders, anti-collision piles 28 and other ancillary structures are erected;

B6. Lift the cement tank 21 and reinforce the tank legs, and then tie the cement tank 21 with a wire rope and pull it to the bottom steel pipe pile 20 to form a windproof cable to achieve the anti-typhoon reinforcement effect;

B7. Installation of unloading system 22 such as lower auger and weighing system;

B8. Installation of automatic grout mixer, first grout storage tank 23, first grouting pump 24 and other equipment;

B9. Install the backstage generator 26, the backstage oil storage tank 25, the backstage distribution box 27 and other equipment, and perform the wiring of various electrical equipment;

B10. Lay the first slurry delivery pipe 30 and connect the slurry mixing backstage 19 with the cement mixing pile mobile steel platform 1 frontstage;

B11. Lay the underwater water pipe 32 and connect the slurry mixing backstage 19 with the tap water pipe mouth of the municipal water intake point 33 on the shore.

The implementation method of the deep mixing pile water-to-land construction technology of the present invention is as follows: it mainly includes the following aspects:

C1. Selection and batch entry of mobile steel platform 1;

C2. Selection and batch entry of mixing pile drivers and supporting equipment;

C3. Complete the assembly of the platform foundation, pile driver equipment, grouting equipment, power equipment and ancillary facilities of each mobile steel level 1 in order to form a "product" shape distribution, which can coordinate the stress conditions of the platform foundation while maximizing the Chemicalization brings out work efficiency;

C4. The erection of each slurry mixing backstage 19 and the assembly of cement tanks 21, blanking equipment, slurry mixing equipment, power systems and slurry delivery pipes;

C5, laying of water pipe 32 and delivering water;

C6. Cement supply ship 31 supplies cement on site;

C7. Each unloading equipment and slurry mixing equipment prepare slurry that meets the design requirements;

C8. The grouting system of the grout mixing backstage 19 delivers grout to the second grout storage tank 11 of each mobile steel platform 1;

C9. The second grouting pump 12 of each mobile steel platform 1 injects grouting into the inner drill pipe 7;

C10. The mixing pile machine is operated to drill and spray grout. According to the design instructions, after four stirring and three spraying constructions, a deep mixing pile that meets the design requirements is formed.

Since the steel platform support piles 13 of the offshore steel platform are positioned with high precision during pile sinking construction, the steel platform rails 15 are parallel to the moving direction of the mobile steel platform 1, and the drill pipes of the two pile machine equipment on the mobile steel platform 1 The center of the drill pipe 7 is perpendicular to the moving direction of the mobile steel platform 1. During construction, only the center of the drill pipe 7 needs to be staked out.

The construction details of the mixing pile are as follows:

S2. The construction personnel adjust the position of the pile driver equipment so that the center of the drill pipe 7 of the pile driver equipment is aligned with the pile position of one group of mixing piles in one row, and fix the pile driver equipment and the mobile steel platform 1 ;

S3. Check the verticality of the drill pipe 7. If the verticality deviation of the drill pipe 7 exceeds the allowable value, adjust the verticality of the drill pipe 7 by raising or lowering the pile driver legs 5 of the tower 4 of the pile driver equipment. , so that the verticality deviation of the drill pipe 7 is within the allowable value range, thereby realizing the dynamic adjustment function of the drill pipe 7;

S4. Through the grout mixing backstage 19, the materials are mixed with water according to the mix ratio. After the cement slurry is obtained and passes the test, it is delivered to the mobile phone through the first grouting pump 24 of the grouting mixing backstage 19 and through the first grout delivery pipe 30. In the second slurry storage tank 11 of the steel platform 1;

S5. Start the generator 9 on the mobile steel platform 1, and turn on the motor of the second slurry storage tank 11 to stir the slurry a second time;

S6. Turn on the winch and power head 6 of the pile driver equipment, and start the second grouting pump 12 on the mobile steel platform 1 to deliver slurry to the drill pipe 7 of the pile driver equipment. The drill pipe 7 begins to rotate and drill the mixing pile until the row of The construction of this group of mixing piles is completed, and then the drill pipe 7 is lifted to the water surface by reversing the winch at an even speed; specifically, the winch and power head 6 on the pile driver equipment are started, and the drilling is started to be rotated; according to the elevation of the bottom of the drill bit, the surveyor The absolute elevation calculation is used to report the depth to start spraying and the depth to which the drill bit needs to drill; after the drill bit enters the water, it drills down to the front of the mud to start spraying. While drilling at a constant speed, the inner and outer drill pipes 7 rotate in two directions to cut the soil and pass through the cement slurry. After fully stirring and mixing until it stays at the designed pile end elevation for 30 seconds, the winch begins to rotate in reverse to drive the drill pipe 7 to be shot up to the design pile top elevation with uniform speed; the winch repeatedly rotates forward to drive the drill pipe 7 to be drilled down to the design pile with uniform speed spraying. After staying at the end elevation position for 30 seconds, the spraying is stopped. The winch repeatedly rotates in the opposite direction to drive the drill pipe 7 to lift out of the water surface at a constant speed. The current mixing pile construction is completed; the operator uses a special work shovel to remove the clay mass wrapped in the drill bit, and the surveyor re-stakes the row. Enter the next group of pile positions and enter step S7;

S7. With the help of the pile driver slide rail 2 on the mobile steel platform 1, adjust the position of the pile driver equipment longitudinally along the pile driver slide rail 2 so that the next group of mixing piles in the row can be repositioned, and then repeat step S6 to complete the process. Construction of the next group of mixing piles in the row;

S8. Repeat step S7 until the construction of all groups of mixing piles in the row is completed;

S9. Lift the power head 6 to the 0 scale, then release the fixation of the mobile steel platform 1, and control the mobile steel platform 1 to move longitudinally on the steel platform rail 15 until the center of the drill pipe 7 is aligned with the central axis of the next row of mixing piles. Repeat steps S2-S8 until the construction of the next row of mixing piles is completed;

S10. Repeat step S9 until the construction of all rows of mixing piles is completed.

The above solution is based on the premise that the mobile steel platform 1 in Embodiment 1 can cover the transverse or longitudinal direction of the construction area 34. The construction area 34 is divided into several rows of mixing pile construction areas in the longitudinal or transverse direction, and each row of mixing piles is constructed along the It has several groups in its longitudinal direction. That is, every time the mobile steel platform 1 moves, all groups of mixing piles in each row can be completed by adjusting the pile driver equipment of the mobile steel platform 1.

The mobile steel platform 1 is positioned on the steel platform rail 15 above the offshore steel platform so that the center of the drill pipe 7 of the pile driver equipment above the mobile steel platform 1 corresponds to the center of a group of mixing piles in one row. 2. The pile driver equipment on the mobile steel platform 1 can be adjusted to correspond to different groups of mixing piles in the row, and construction is generally carried out from one side of the construction area 34 to the other side. That is, first construct one group of mixing piles in one row, and then move the pile driver equipment along the pile driver slide rail 2 to construct other groups of mixing piles in the row. After the construction of the row is completed, the pile driver can be installed on the steel platform rail. 15. Move the mobile steel platform 1 up to the position of the next row of mixing piles, and then construct the next row of mixing piles until the construction is completed.

The offshore deep mixing pile water-to-land construction method utilizes the construction area 34 stably covered by the offshore steel platform as the construction platform, making it possible to utilize the steel platform rails 15 on the offshore steel platform and the pile driver slide rails of the mobile steel platform 1 2. The adjustment allows the drill pipe 7 of the pile driver equipment to be positioned and fixed with different mixing piles, making the entire process of positioning and anchoring more convenient, and the construction is orderly, which can ensure the continuity during the construction of the mixing piles, and can greatly The construction efficiency is improved, and the positioning during construction is more accurate and stable, making the construction of mixing piles of higher quality and construction safer.

When the three mobile steel platforms 1 arranged in a Z-shaped arrangement in Embodiment 1 are used to construct all the mixing piles in the construction area 34, as shown in Figure 1, it is necessary to divide the mixing piles in each row into upper, middle and lower parts. Three parts, each part has several groups. Each movement of each mobile steel platform 1 can complete the construction of the corresponding part of the row of mixing piles. In this case, if the construction is to the right, one row of the mixing piles will be constructed first. The upper and lower parts are constructed first, and are constructed after the mixing piles in the back row, so that the two mobile steel platforms 1 on the right do not interfere with the mobile steel platform 1 on the left, and then the construction is carried out through the mobile steel platform 1 on the left. The three mobile steel platforms 1 are distributed in a vertical shape on the offshore steel platform, and the mixing piles at different positions can be constructed at the same time without interfering with each other. They can operate at multiple points along the longitudinal direction of the construction area 34 at the same time, which can improve the construction efficiency. And the construction can be completed and moved synchronously, so that all the mobile steel platforms 1 can supply slurry through the same similar slurry mixing backstage 19. When all the mobile steel platforms 1 arrive at a certain place in the construction area 34, they all pass the corresponding mixing equipment there. The slurry backstage 19 provides slurry, so it is only necessary to directly connect the slurry mixing backstage 19 there to the nearby municipal water intake point 33 through the water pipe 32, which can reduce the difficulty of laying various pipelines, so that each slurry mixing backstage 19 can It is easier to obtain municipal water, which can improve the quality of the slurry and improve the quality of the mixing pile. In addition, this manner in which multiple mobile steel platforms 1 are arranged laterally along the construction area 34 enables construction of a wider area of the construction area 34.

And in step S1, make the longitudinal direction of the steel platform rail 15 perpendicular to the line connecting the center of the pile positions of each row of mixing piles, and make the pile driver slide rail 2 parallel to the line connecting the center of the pile positions of each row of mixing piles, and on the steel platform The rail 15 is marked by spraying standard fluorescent scale lines, and a vertical hanging pin is set at the bottom of the moving steel platform 1; so that in step S2, the moving steel platform 1 can be moved to the point where the hanging pin at the bottom is moved above the corresponding scale line. Make the center position of the drill pipe 7 basically coincide with the center of the mixing pile, and then recheck the offset of the drill pipe 7. If the offset of the drill pipe 7 exceeds the allowable deviation, fine-tune the mobile steel platform 1 to make the center position of the drill pipe 7 consistent with the mixing pile. The pile positions are fixed immediately after their centers coincide with each other. This enables the center position of the drill pipe 7 to coincide with the pile position center of the mixing pile more quickly, ensuring the positioning effect, improving the construction efficiency and construction quality of the mixing pile, making the pile position control effect of the cement mixing pile after construction better, and meeting the requirements Design accuracy.

The invention provides an offshore deep mixing pile water-to-land construction system and a construction method. The water-to-land construction technology of the deep mixing pile meets maritime related requirements and on the one hand, it has the conditions for the construction of deep mixing piles of more than 15m. On the other hand, It has high overall stability and overcomes the problem of insufficient ship construction stability to ensure the construction pile position and pile quality, and has high applicability; the deep mixing pile water-to-land construction process is not affected by the water level during the construction process. The absolute elevation is used to control the pile top and pile bottom elevations to ensure the construction quality of the pile length; the deep mixing pile water-to-land construction technology is used to convert the moving water ship-type construction into a fixed platform construction, which on the one hand reduces ship collisions The risk of loss caused by existing buildings, on the other hand, will cause relatively little disturbance to existing buildings, avoiding large settlement and horizontal displacement deformation of existing buildings. The construction is carried out in a way that the front stage composed of the offshore steel platform and the mobile steel platform 1 and the slurry mixing backstage 19 cooperate with each other to overcome the shortcomings such as the limited location of the slurry mixing equipment and the easy blocking of pipes when delivering slurry over long distances, and has the advantages of simple operation and easy replication; For the linear construction area 34, a multi-point arrangement can be adopted, and multiple mobile steel platforms 1 can be used to form a staggered arrangement in front and back to participate in the construction. At the same time, two pile drivers can be arranged in parallel on the mobile steel platform 1 to carry out construction, and save ship-type construction. The anchor lifting and anchoring process has greatly improved the construction efficiency. In the 34th area of the offshore construction area, independent platform foundations are set up instead of trestles to form water-to-land construction conditions. It has the advantages of low cost, good economic benefits, and no impact on water transportation and other processes. It is also simple to assemble and disassemble, and has high turnover efficiency, which indirectly ensures cement mixing. The construction efficiency of the piles; two cement tanks 21 are arranged on the slurry mixing backstage 19 to form a complement, fully ensuring the supply of cement, avoiding the interruption of slurry supply caused by cement material breakage, and affecting the quality of the piles; it can meet the requirements of large-scale construction under the condition of being close to existing buildings. The area is constructed with high efficiency, and the pile position is ensured with high precision under the conditions of deep pile construction, overcoming the adverse effects of tide level changes. This deep mixing pile water-to-land construction technology has strong applicability, high platform stability, high construction efficiency, safety and reliability, etc., truly realizing efficient and safe construction of deep mixing piles in "extensive restricted spaces" and under special conditions.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (7)

1. The marine deep mixing pile water-land construction system is characterized by comprising a mobile steel platform (1), a slurry mixing background (19) and a marine steel platform;

the offshore steel platform is paved in a construction area (34) of the stirring pile, and a steel platform rail (15) is paved above the offshore steel platform along the longitudinal direction or the transverse direction of the offshore steel platform; the offshore steel platform comprises a plurality of steel platform supporting piles (13), a plurality of steel platform main beams (14) and a plurality of steel platform scissor supports (16); the steel platform support piles (13) are uniformly distributed at intervals in the transverse direction and the longitudinal direction of the construction area (34), and steel platform pile caps (17) are arranged at the tops of the steel platform support piles (13); the steel platform main beam (14) is arranged on the steel platform pile cap (17) along the longitudinal pull-through direction of the construction area (34), and the steel platform rail (15) is longitudinally arranged on the steel platform main beam (14) along the steel platform main beam (14); the steel platform scissor struts (16) are arranged between the tops of two longitudinally adjacent steel platform supporting piles (13) or between the tops of two transversely adjacent steel platform supporting piles (13);

The movable steel platform (1) is arranged above the offshore steel platform, the movable steel platform (1) can move and be fixed along the longitudinal direction of the steel platform rail (15), and pile driver equipment is arranged above the movable steel platform (1) and used for constructing cement stirring piles; the mobile steel platform (1) comprises a platform foundation, wherein the bottom of the platform foundation is provided with a mobile platform steel wheel (18), the mobile platform steel wheel (18) can drive the platform foundation to longitudinally move along a steel platform rail (15), and the bottom of the platform foundation is also provided with a rail clamping device which can clamp the steel platform rail (15) and then fix the platform foundation; at least two parallel pile driver sliding rails (2) are paved above the platform foundation, the longitudinal direction of the pile driver sliding rails (2) is vertical to the longitudinal direction of the steel platform rail (15), pile driver bases (3) are connected to all the pile driver sliding rails (2) in a sliding mode, pile driver equipment is fixedly arranged on one side, close to the edge of the platform foundation, of the pile driver bases (3), the pile driver equipment comprises a vertically arranged tower (4), the bottom of the tower (4) is connected to the pile driver bases (3), the upper portion of the tower (4) is connected to one side, far away from the edge of the platform foundation, of the pile driver bases (3) through pile driver supporting legs (5), a power head (6) is installed at the top of the tower (4), and a vertical drill rod (7) is connected to the lower end of the power head (6); the power equipment is arranged on one side of the platform foundation, which is far away from the pile driver equipment and is used for supplying power to the pile driver equipment; a second slurry storage tank (11) and a second slurry injection pump (12) are arranged on the mobile steel platform (1), the first slurry injection pump (24) is communicated with the first slurry storage tank (23) and the second slurry storage tank (11) through a first slurry feeding pipe (30), and the second slurry injection pump (12) is communicated with the second slurry storage tank (11) and pile driver equipment through a second slurry feeding pipe; the automatic mixer is used for receiving cement in a cement tank (21) and carrying out primary mixing and then conveying the cement into a first slurry storage tank (23), the first slurry storage tank (23) is used for pumping mixed slurry into a second slurry storage tank (11) through a first slurry injection pump (24), the second slurry storage tank (11) can be used for carrying out secondary mixing on the slurry, and the second slurry storage tank (11) is used for pumping the secondarily mixed slurry into pile driver equipment through a second slurry injection pump (12);

The slurry mixing background (19) is fixedly arranged at sea adjacent to the construction area (34), and the slurry mixing background (19) is used for mixing slurry and conveying the mixed slurry to the mobile steel platform (1);

the cement mixing background (19) is provided with a cement tank (21), an automatic mixer, a first slurry storage tank (23) and a first slurry injection pump (24), the cement tank (21) is arranged in the middle of the cement mixing background (19), and the first slurry storage tank (23) and the first slurry injection pump (24) are arranged on one side, close to a construction area (34), of the cement mixing background (19).

2. The marine deep mixing pile water-land construction system according to claim 1, wherein the mixing back stage (19) is provided with at least two cement tanks (21), and the two cement tanks (21) are symmetrically arranged in the middle of the mixing back stage (19).

3. The marine deep mixing pile water-land construction system according to claim 1, wherein the mixing back stage (19) comprises a plurality of steel pipe piles (20), the steel pipe piles (20) are anchored on the sea bottom, and the top surfaces of the steel pipe piles (20) are higher than the sea level; pile top cover plates are welded at the tops of all the steel pipe piles (20), double-spliced I-steel main beams are erected and fully welded on the pile top cover plates, a plurality of I-steel secondary beams are welded above the double-spliced I-steel main beams at intervals, and steel plates are fully paved above the I-steel secondary beams;

A fixing rope is wound on the cement tank (21) and is connected to the steel pipe pile (20).

4. A marine deep mixing pile water-to-land construction system according to any one of claims 1-3, further comprising a cement replenishment vessel (31), the cement replenishment vessel (31) being adapted to transport cement to a cement tank (21) of the post-mixing stage (19);

a protective structure is arranged on one side of the slurry mixing background (19) far away from the construction area (34), and comprises at least two clusters of protective members consisting of three anti-collision piles (28);

three anti-collision piles (28) of each protection member are arranged in an equilateral triangle, horizontal supports are arranged between adjacent anti-collision piles (28), one anti-collision pile (28) is arranged away from the slurry mixing background (19), the distance between the remaining two anti-collision piles (28) and the slurry mixing background (19) is equal, and a rubber fender is arranged outside the anti-collision pile (28) which is arranged away from the slurry mixing background (19).

5. A marine deep mixing pile water-land construction system according to any one of claims 1-3, characterized in that a plurality of mixing backrests (19) are arranged at intervals along the longitudinal direction of the construction area (34), three mobile steel platforms (1) are arranged transversely of the construction area (34), the three mobile steel platforms (1) are distributed in a delta-shaped manner on the marine steel platforms, all pile machine equipment are oriented the same and are all in the longitudinal direction of the marine steel platforms, the mixing backrests (19) close to the municipal water intake point (33) are directly communicated through a water pipe (32), and all mobile steel platforms (1) are supplied with slurry through the same mixing backrests (19) which are close to each other.

6. A method for constructing a stirring pile by converting an offshore deep stirring pile into a land, which is characterized by adopting the offshore deep stirring pile water-land construction system as claimed in any one of claims 1-5, and comprising the following steps:

s1, installing a marine deep mixing pile water-land construction system, so that a slurry mixing background (19) meets slurry mixing conditions, mixed slurry can be conveyed to a movable steel platform (1), the movable steel platform (1) can move and be fixed along a steel platform rail (15) on the marine steel platform, and pile driver equipment on the movable steel platform (1) can move along a pile driver sliding rail (2) along a direction perpendicular to the steel platform rail (15) of the movable steel platform (1);

s2, adjusting the position of the pile driver equipment by constructors to enable the center of a drill rod (7) of the pile driver equipment to be aligned with the pile position of one group of stirring piles in one row under the condition of allowable deviation, and fixing the pile driver equipment and the movable steel platform (1);

s3, checking the verticality of the drill rod (7), and if the verticality deviation of the drill rod (7) exceeds an allowable value, adjusting the verticality of the drill rod (7) by lifting or lowering the pile machine support leg (5) of the tower (4) of the pile machine equipment, so that the verticality deviation of the drill rod (7) is within the allowable value range;

S4, beginning to mix slurry by mixing water according to the mixing ratio by a slurry mixing background (19), preparing cement slurry, and conveying the cement slurry into a second slurry storage tank (11) of the mobile steel platform (1) through a first slurry conveying pipe (30) by a first slurry injection pump (24) of the slurry mixing background (19) after the cement slurry is tested to be qualified;

s5, starting a generator (9) on the movable steel platform (1), and starting a motor of the second slurry storage tank (11) to stir the slurry for the second time;

s6, starting a winch and a power head (6) of the pile driver equipment, starting a second grouting pump (12) on the mobile steel platform (1) to convey slurry to a drill rod (7) of the pile driver equipment, starting to rotate the drill rod (7) to drill down the stirring piles until the construction of the group of stirring piles in the row is completed, and then lifting the drill rod (7) to the water surface at uniform speed through a reversing winch;

s7, longitudinally adjusting the position of the pile driver equipment along the pile driver sliding rail (2) by means of the pile driver sliding rail (2) on the mobile steel platform (1) so as to enable the stirring piles of the next group of the row to be repositioned, and then repeating the step S6 to finish the construction of the stirring piles of the next group of the row;

s8, repeating the step S7 until the construction of all groups of stirring piles in the row is completed;

s9, lifting the power head (6) to the 0 scale, then releasing the fixation of the movable steel platform (1), controlling the movable steel platform (1) to longitudinally move to the center of the drill rod (7) in the steel platform rail (15) to be aligned with the central axis of the next row of mixing piles, and repeating the steps S2-S8 until the construction of the next row of mixing piles is completed;

S10, repeating the step S9 until the construction of all rows of stirring piles is completed.

7. The marine deep mixing pile water-land construction method according to claim 6, characterized in that in step S1, the longitudinal direction of the steel platform rail (15) is made to be perpendicular to the pile position center connecting line of each row of mixing piles, the pile machine sliding rail (2) is made to be parallel to the pile position center connecting line of each row of mixing piles, the steel platform rail (15) is marked in a mode of spraying standard fluorescent scale marks, and a vertical suspension needle is arranged at the bottom of the mobile steel platform (1);

in the step S2, the suspension needle at the bottom of the movable steel platform (1) is moved to the position above the corresponding scale mark to enable the center position of the drill rod (7) to be basically coincident with the pile position center of the stirring pile, then the deviation of the drill rod (7) is rechecked, and if the deviation of the drill rod (7) exceeds the allowable deviation, the movable steel platform (1) is finely adjusted to enable the center position of the drill rod (7) to be immediately fixed after being coincident with the pile position center of the stirring pile.