CN107653895A - Six floating drum buoyancy tank foundation structures and its construction method on a kind of combined type sea - Google Patents

Abstract

The invention belongs to the infrastructure technologies field of ocean engineering, disclose six floating drum buoyancy tank foundation structures and its construction method on a kind of combined type sea, its foundation structure is sequentially connected the floating drum for surrounding regular hexagon and being arranged according to its central point in the horizontal plane including six, a buoyancy tank is connected between per two neighboring floating drum, the center line of buoyancy tank along its length passes through the axis of its both ends floating drum；Floating drum and buoyancy tank top are connected with changeover portion pylon, and changeover portion pylon is used to connect top wind power equipment；The step of its construction method enters water, suction penetration, grouting ballast, installation superstructure, recycling including precast construction, initial adjustment preparation, delivery waterborne, basis.The present invention has the characteristics of gravity type foundation and suction bucket foundation concurrently, and while bearing power increase, transport mounting means is easy, and recyclable recycling, construction cost substantially reduces.

Description

A combined offshore six-pontoon pontoon foundation structure and its construction method

technical field

The invention belongs to the technical field of basic structure of ocean engineering, in particular, it relates to a basic structure applied to offshore wind power and offshore wind measurement facilities and its construction method, which realizes the integration of overall assembly, transportation control, sinking installation and recovery. chemical work.

Background technique

The development of offshore wind farms has gradually received more and more attention and participation. The construction of offshore wind farms needs to consider the basic structure of equipment installation, typical important structures such as offshore wind measuring towers and offshore wind turbines. The traditional foundation types include gravity foundation and single pile foundation. At present, most of the foundation types used include steel pipe pile foundation (wind measuring tower), tripod foundation, jacket foundation and suction cylinder foundation (wind turbine). Among these foundation types, the construction technology of steel pipe piles, monopile, tripod, jacket and other foundation types is complicated, and transportation and installation require large-scale machinery for transportation and hoisting, so the construction period is long and the construction cost is high. etc. are difficult to accurately grasp, and the pile sinking efficiency is relatively low. The gravity foundation relies on the weight of the structure as a whole and the weight of the filler and ballast on it to resist external loads and maintain structural stability. The construction principle is simple, the cost of filler and ballast materials is low, and the construction cost is relatively low for shallow foundations; but for The self-weight and geometric dimensions of the foundation are large, and the foundation occupies a wide range of seabed. For deep waters where seabed conditions are also required, construction, transportation methods and costs are all limited. Therefore, the gravity-based foundation is applicable to a limited range of water depth. The foundation of the suction cylinder has strong bearing capacity, simple transportation and installation, and relatively easy recovery. At the same time, the basic structure of the suction cylinder is simple, and it is applicable to a wide range of seabed conditions. However, the sinking process of the cylindrical foundation with a large aspect ratio has the problems of insufficient sinking and difficult leveling control. At the same time, there are problems such as buckling of steel structures such as skirt plates under working conditions, which also restricts the performance of the cylindrical foundation. develop.

Contents of the invention

In order to comprehensively adopt the characteristics of gravity foundation with low cost, strong bearing capacity, convenient transportation and wide adaptability of suction tube foundation, and to avoid the burden of construction technology and construction cost caused by excessive foundation size of a single structure type, The invention provides a combined offshore six-pontoon pontoon foundation structure and its construction method, which has the characteristics of both a gravity foundation and a suction cylinder foundation. While improving the bearing capacity, the transportation and installation method is simple and can be recycled and reused. The cost is greatly reduced.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

A combined offshore six-pontoon pontoon foundation structure, including six identical pontoons, six identical pontoons, and a transition section tower; the six buoys are connected sequentially on the horizontal plane according to their center points to form regular hexagons Each adjacent two buoys are connected by one buoy, and the center line of the buoy along the length direction passes through the axes of the two ends of the buoy; the buoy and the upper part of the buoy Connecting the transition section tower, the transition section tower is used to connect the upper wind power equipment;

The buoy is composed of a buoy top cover, a tube wall, a tube skirt, radial ribs, circumferential ribs, compartment plates, and a buoy bottom cover; the upper edge of the buoy top cover is provided with the tube wall, and the lower edge is provided with the tube skirt; the buoy top cover and the tube wall constitute the superstructure of the buoy, and the radial ribs and the circumferential ribs are arranged in the superstructure of the buoy; the buoy top cover and the The skirt constitutes the lower structure of the buoy, and a subdivision plate is arranged in the lower structure of the buoy, and the subdivision plate divides the lower structure of the buoy into four to seven mutually sealed compartments; the bottom cover of the buoy It is used to be packaged on the bottom surface of the substructure of the buoy during the floating process;

The buoyant tank is composed of a buoyant tank top plate, a buoyant tank bottom plate, a side plate, an upper rib plate, an anti-slip skirt plate, and a lower rib plate, and the buoyant tank top plate, the buoyant tank bottom plate, and the side plate form a cuboid cavity The casing of the structure, the inside of the casing of the buoyant tank is provided with a plurality of horizontal and vertical upper ribs, and the upper ribs of the plurality of pieces divide the casing of the buoyant tank into interconnected areas; the buoyant tank Air holes are preset at both ends of the top plate, and water holes are preset at both ends of the bottom plate of the buoyant tank, and the water filling and drainage inside the box body of the buoyant tank are realized by using the air holes and the water holes through gas-liquid replacement; The anti-slip skirt is provided on the lower edge of the bottom of the pontoon, and a lower rib is arranged in the space formed by the bottom of the pontoon and the anti-slip skirt;

The tower of the transition section is composed of six identical uprights, several support rods, and twelve oblique rods; the bottom ends of the six uprights are poured into the centers of the buoy top covers of the six buoys respectively and welded together with them, and all Inclining towards the center of the foundation structure at the same angle from bottom to top; multiple support rods are connected between the six columns to form a truss-type steel structure; the diagonal rods are connected between the columns and the adjacent buoys Between, the lower end of the slanting rod is connected to the interior of the pontoon from the center of the top plate of the pontoon, and the inside of the slanting rod is provided with a gas-liquid pipeline extending below the bottom of the pontoon; each of the columns is respectively provided with Gas-liquid pipeline, grouting pipeline and liquid level detection device, wherein the gas-liquid pipeline extends from the column to below the buoy top cover of the buoy, wherein the grouting pipeline extends from the column to the upper structure of the buoy and the buoy Inside the box body of the tank, the liquid level detection device is used to judge the air pressure state in the buoy corresponding to the bottom of the column by observing the change of the liquid level of the liquid after the liquid seal inside the column during the towing process.

Preferably, the total height of the buoy and the buoy is consistent, the height of the wall of the buoy is consistent with that of the skirt, the height of the side plate of the buoy is consistent with that of the anti-skid skirt, and the height of the wall of the buoy is consistent with the height of the skirt. The height of the side plates of the buoyant tank is consistent, and the height of the skirt of the buoy is consistent with that of the anti-skid skirt of the buoyant tank.

Preferably, the subdivision plate of the buoy divides the lower structure of the buoy into a middle compartment and side compartments, the middle compartment is a circle or a regular polygon, and the number of the side compartments is an even number.

Preferably, the lower ribs of the pontoon are cross-shaped partitions.

Preferably, a grouting pipe is arranged inside the inclined rod.

A construction method of the above-mentioned combined offshore six-pontoon pontoon foundation structure is carried out according to the following steps:

(1) each component is prefabricated and processed by the land factory, and the combined offshore six buoy buoy box basic structure is installed into one by the buoy, the buoy box, and the transition section tower;

(2) After sealing the bottom cover of the buoy at the bottom of the buoy, the basic structure of the combined offshore six buoy buoy box is hoisted to the sea surface, and the basic structure is sunk by its own weight and adjusted according to the draft required for towing;

(3) Floating and towing the basic structure of the combined offshore six-pontoon pontoon;

(4) The basic structure of the combined offshore six-pontoon pontoon is consigned to the designated location and then sinks for installation. The lower structure of the pontoon is filled with water until the bottom cover of the pontoon is removed, and then the box of the pontoon is filled with water to make the basic structure The self-weight increases, and the foundation structure sinks further until the skirt of the buoy and the anti-skid skirt of the buoy touch the seabed;

(5) After the skirt of the buoy and the non-slip skirt of the buoy are inserted into the foundation, pump water to the lower structure of the buoy to further sink the foundation until the top cover of the buoy and the bottom plate of the buoy Completely contact the mud surface, and continue to continuously pump water to the substructure of the buoy to carry out negative pressure reinforcement treatment to the soil;

(6) After the negative pressure reinforcement is completed, use the grouting pipeline to grout the inside of the buoyant box, and perform riprap ballast or grouting ballast on the upper structure of the buoy;

(7) After the grouting treatment is completed, the upper wind power equipment is hoisted and installed on the water, and the construction is completed.

Wherein, the adjustment in step (2) according to the draft required for towing is specifically performed by adjusting the ballast water volume inside the tank of the buoy or the displacement of the substructure of the buoy.

Wherein, the floating towage described in step (3) adopts single-point or two-point consignment, and before the consignment, carry out the internal inspection of the other five or four described buoys except the described buoys with mooring points. Filled with water ballast, so that the foundation structure has a setback angle to neutralize the phenomenon of submergence.

Wherein, during the negative pressure sinking process described in step (5), the leveling is performed by increasing the pumping rate at the substructure of the buoy that is inclined upward and/or inflating or filling the substructure of the buoy that is inclined downward operate.

Wherein, when recycling, first dismantle and hoist the upper wind power equipment, and secondly inject water or inflate the inside of the skirt of the buoy through the gas-liquid pipeline inside the vertical pole to increase the internal pressure, and through the gas-liquid pipeline inside the inclined pole. The anti-slip skirt of the pontoon is injected with water or inflated to increase the internal pressure, so that the skirt of the pontoon and the anti-skid skirt of the pontoon are separated from the foundation, and after the entire foundation structure slowly floats to the sea surface, Tow it back to land by tugboat.

The beneficial effects of the present invention are:

The combined offshore six-pontoon pontoon foundation structure of the present invention is composed of six pontoons, six pontoons and a transition section tower; At the same time, the combination of six buoys greatly reduces the diameter of each buoy compared with the geometric shape of the same size cylinder foundation or gravity foundation; Two independent buoys are combined into an integrated structure, the upper box is load-bearing, the lower anti-skid skirt increases the stability of the structure against slipping, and after the sinking is completed, the grouting in the upper box becomes the base of the overall structure; therefore, the buoy also has both The characteristics of the gravity structure and the suction skirt structure; the combined structure of the pontoon and the pontoon strengthens the interaction between the pontoons, and at the same time, the support of the anti-skid skirt at the lower part of the pontoon improves the lateral stiffness of the pontoon skirt and prevents the sinking process The buckling phenomenon occurs in the mid-tube skirt; in addition to being used as the connection structure of the upper wind power equipment, the main function of the tower structure in the transition section is to set up a piping system inside, which can realize inspection during transportation, leveling and grouting after installation operate. After the upper wind power equipment is installed, the supporting point of the tower structure in the transition section will evenly distribute the load of the upper structure to the six buoys and six pontoons, so as to give full play to the bearing capacity of each component in the combined foundation structure.

The combined offshore six-pontoon pontoon foundation structure and its construction method of the present invention make the waterline surface area of a single pontoon smaller, and the towage process is easy to accurately control the leveling, and at the same time, the combination of the pontoon structure increases the coordination between the six pontoons As a result, the contact area between the bottom surface of the foundation and the seabed is increased, and the bearing capacity of the end is increased. Furthermore, the buoyancy box is used as the supporting structure of the tower in the upper transition section, which optimizes the force transmission system of the structure and makes each part of the foundation more stressed. is uniform. Since the upper part of the buoy and the inside of the buoy box need to be ballasted and grouted to increase the self-weight of the foundation structure, improve the stability against overturning, and improve the overall bearing capacity, the height of the lower skirt of the buoy and the buoy can be greatly reduced, saving At the same time, the foundation sinking depth is reduced, the probability of inclination during the sinking process is reduced, the sinking leveling operation is greatly simplified, and the overall construction measures are optimized.

Description of drawings

Fig. 1 is the schematic diagram of the three-dimensional structure of the six buoy buoy box basic structure of the combined sea buoy provided by the present invention;

Fig. 2 is the schematic diagram of the top view angle of view of the basic structure of the combined offshore six buoy buoy box provided by the present invention;

Fig. 3 is the bottom perspective view schematic diagram of the combined offshore six buoy buoy box foundation structure provided by the present invention;

Fig. 4 is the buoy structure schematic diagram of the six buoy buoy buoy box basic structure of combined type sea provided by the present invention;

Fig. 5 is the pontoon structure schematic diagram of the combined offshore six buoy pontoon basic structure provided by the present invention;

Fig. 6 is a schematic diagram of the tower structure in the transition section of the combined offshore six-pontoon pontoon foundation structure provided by the present invention.

In the figure: 1, buoy, 11, top cover of buoy, 12, tube wall, 13, tube skirt, 14, radial rib, 15, circumferential rib, 16, subdivision plate, 17, bottom cover of buoy; 2, Floating tank, 21, floating tank roof, 22, floating tank bottom plate, 23, side plate, 24, upper rib, 25, anti-slip skirt, 26, lower rib; 3, transition section tower, 31, column, 32, support rod, 33, oblique rod.

Detailed ways

In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

As shown in Figures 1 to 3, this embodiment discloses a combined offshore six-pontoon pontoon foundation structure, which mainly includes six identical buoys 1, six identical pontoons 2, and a transition section tower 3.

The six buoys 1 are connected successively according to their center points on the horizontal plane and can be arranged in a regular hexagon.

As shown in Figure 4, each buoy 1 is composed of a buoy top cover 11, a cylinder wall 12, a tube skirt 13, a radial rib 14, a circumferential rib 15, a subdivision plate 16, and a buoy bottom cover 17, wherein the buoy bottom cover 17 is not fixedly connected with other components and is only used during transportation. The upper edge of the circular buoy top cover 11 is provided with an annular cylinder wall 12, and the lower edge is provided with an annular cylinder skirt 13. The height of the cylinder wall 12 and the cylinder skirt 13 is approximately close to ensure that the upper and lower parts of the buoy 1 have a common and equivalent structure. Function. The upper structure of the buoy 1 composed of the buoy top cover 11 and the cylinder wall 12 has the characteristics of a gravity cylinder foundation, and can be used as a ballast area after installation. Uniformly distributed radial ribs 14 and evenly distributed circumferential ribs 15 are arranged in the upper structure of the buoy 1 mainly to prevent deformation of the cylinder wall 12 after ballasting. The lower structure of the buoy 1 composed of the buoy top cover 11 and the tube skirt 13 has the characteristics of a wide and shallow suction cylinder foundation. On the one hand, it is used to seal the buoy bottom cover 17 at the bottom during the floating and towing process, as a buoy to increase the structural buoyancy and realize the towing process. On the other hand, during the sinking installation process, the buoy bottom cover 17 is pulled away to ensure its normal sinking, and the lower tube skirt 13 and the inner compartment plate 16 are finally inserted into the foundation. The foundation can be closely fitted, and at the same time, the foundation can be strengthened. While ensuring the structure's anti-overturning stability, it also exerts horizontal anti-slip stability. The lower structure of the buoy 1 is provided with a compartment plate 16, which divides the space formed by the top cover 11 and the tube skirt 13 into four to seven compartments, and the seal between each compartment is watertight and airtight, which can be realized independently Leveling operation during towing and sinking; the shape of the middle cabin is not limited to the circle shown in this embodiment, but can also be set as a regular polygon, and the structure is more flexible.

Six floating tanks 2 connect six buoys 1 to each other, and one buoyant tank 2 is connected between every two adjacent buoys 1 . The two ends of the buoyancy tank 2 are welded on the buoy drum 1, so that six buoyant tanks 2 and six buoy drums 1 form a whole, and the center line along the length direction of the buoyant tank 2 passes through the axis of the buoy drum 1 at its two ends. The total height of the pontoons 1 and the pontoons 2 is consistent to ensure that the entire foundation structure has a flush upper and lower profile, and the superstructure load can be evenly transmitted to each pontoon 1 and pontoons 2 of the foundation structure.

As shown in Figure 5, floating tank 2 is made of floating tank roof 21, floating tank bottom plate 22, side plate 23, upper rib 24, anti-skid skirt 25, lower rib 26. The pontoon top plate 21, the pontoon bottom plate 22, and the side plates 23 form a box body with a cuboid cavity structure. The upper structure of the pontoon and the bottom surface of the box body of the pontoon 1 are flush to ensure that the foundation and the seabed surface are fully fitted after the sinking is completed. The interior of the buoyancy tank 2 is provided with a plurality of horizontal and vertical upper ribs 24. The plurality of upper ribs 24 divide the inside of the buoyancy tank 2 into a plurality of interconnected areas. The function of the upper ribs 24 is to strengthen the inside of the buoyancy tank 2. Stiffness, to prevent buckling deformation of the side plate 23 of the steel structure after grouting. Both ends of the floating tank top plate 21 are preset with valve-controlled air holes for inflating or exhausting during air-water replacement; the two ends of the floating tank bottom plate 22 are preset with valve-controlled water holes for adjusting the water filling in the floating tank. Both air holes and water holes can be provided with multiple spares to prevent individual blockages. The air hole is connected with an independent pipeline system, and the water hole is not provided with a pipeline, and the inside of the box body of the buoyant tank 2 can be filled with water and drained by gas-liquid replacement. The bottom edge of the pontoon bottom plate 22 is provided with an anti-skid skirt 25, and the anti-skid skirt 25 is approximately close to the height of the side plate 23, so as to ensure that the upper and lower parts of the pontoon 2 have a common and equivalent function. The space formed by the pontoon bottom plate 22 and the anti-skid skirt 25 is provided with a lower rib 26, and the lower rib 26 is a cross-shaped partition plate. Lateral stiffness while increasing side friction for improved stability. It is good that the anti-skid skirt plate 25 of buoyancy tank 2 is consistent with the tube skirt 13 of buoy drum 1, is convenient to operate. During the towing process, the body of the pontoon 2 can be filled with water to increase its own weight, and by adjusting different drafts, it can meet the requirements of towing stability; when it is sinking and installed, it is fully filled with water to ensure the sinking rate, and the foundation sinking is completed Finally, the inside of the box body of the buoyancy tank 2 is grouted and consolidated through the grouting pipe of the transition section tower 3, and the structure self-weight is increased so that it has the characteristics of a gravity-type foundation structure. The anti-skid skirt 25 of a circle around the bottom of the pontoon 2 mainly provides anti-slip and anti-overturning bearing capacity, while the pontoon bottom plate 22 has a larger area and can be used as the main foundation base structure.

As shown in FIG. 6 , the transition section tower 3 is composed of six identical columns 31 , several support rods 32 , and twelve inclined rods 33 . The bottom ends of the six columns 31 are poured into the centers of the buoy top covers 11 of the six buoys 1 respectively and welded together with them. The six columns 31 are all inclined to the center of the basic structure at the same angle from bottom to top; there are many welding between the six columns 31 The support rods 32 constitute a truss-type steel structure. Since the column 31 of the tower 3 of the transition section is inserted into the buoy 1, a cross-shaped stiffener should be provided inside the insertion section of the column 31 to prevent deformation. The tower 3 in the transition section is mainly used to connect the combined foundation structure and the upper wind power equipment, and the height of the tower is adjusted accordingly according to the actual water depth. Each column 31 is provided with a gas-liquid pipeline, a grouting pipeline, and a liquid level detection device, wherein the gas-liquid pipeline extends from the column 31 to below the buoy top cover 11 of the buoy 1, which can fill and drain the lower structure of the buoy 1. The lower structure of the buoy 1 can be inflated and exhausted; the interface of the grouting pipeline can be set at a certain height of the side wall of the column 31, and the grouting pipeline extends from the column 31 to the upper structure of the buoy 1 and the inside of the buoy 2 box. A slanting rod 33 is connected between each column 31 and its adjacent pontoon 2, and the lower end of the slanting rod 33 is connected to the inside of the pontoon 2 from the center of the pontoon top plate 21, and the slanting rod 33 is used to transmit the load of the upper structure to the pontoon. In addition to the function of 1, gas-liquid pipelines and grouting pipelines are also arranged inside, and the gas-liquid pipelines can be set close to the upper rib 24 in the middle position in the buoyancy tank 2 and extend below the bottom plate 22 of the buoyancy tank for The inside of the anti-slip skirt 25 is inflated; its grouting pipeline extends below the top plate 21 of the buoyancy tank, and is used for grouting the inside of the tank of the buoyancy tank 1 .

After the structural installation is completed, the upper structure of the buoy 1 is ballasted with riprap or grouted through the grouting pipeline, and at the same time, the inside of the buoyancy tank 2 is filled with mortar through the grouting pipeline, and the inside of the column 31 is not grouted. unobstructed. Each area inside the tank of the buoyancy tank 2 is connected, so it can ensure that the mortar is filled with the whole tank of the buoyant tank 2. Generally, the grouting pipeline of each column 31 is provided with two outlets, which are connected to the two outlets connected to the same buoy 1 respectively. The pontoons 2 are grouted at the same time, so as to ensure that the same pontoon 2 realizes the grouting speed from both ends to the middle, and improves the construction speed and the uniformity of grouting. Each column 31 and its adjacent buoyancy tank 2 are connected with a slanting rod 33 and can also realize the extension grouting from the middle part of the tank body of the buoyancy tank 2 to both ends. This grouting method can be carried out simultaneously with the grouting through the buoy 1. separately.

The six uprights 31 of the tower 3 in the transition section can also be used as a leveling observation system. The main principle is to fill the inside of the uprights 31 with a liquid-sealed gas. The change of the liquid level of the liquid after the internal liquid seal of the column 31 can judge the air pressure in the buoy 1 corresponding to the bottom of the column 31 and whether there is air leakage, so as to control the air pressure balance inside the six buoys 1 and ensure that the entire basic structure is in an upright state .

When the structure is recovered as a whole, the gas-liquid pipeline inside the vertical rod 1 injects water or inflates the inside of the tube skirt 13 of the buoy 1, and the gas-liquid pipeline inside the inclined rod 33 injects water or inflates the inside of the anti-skid skirt 25 of the buoyancy tank 2 In this way, the inner air pressure of the tube skirt 13 of the buoy 1 and the anti-skid skirt 25 of the pontoon 2 is increased, and the total pressure difference is reduced to gradually lift up the foundation structure. After the tube skirt 13 and the anti-skid skirt 25 are separated from the seabed, the foundation will slowly Floating, and finally towed to the shore.

The six buoys 1 and the six buoys 2 are welded together sequentially and are independent of each other. Measures such as inflation, drainage, and grouting between each part can be carried out independently and simultaneously without interfering with each other, which shortens the construction period.

The construction method of the above-mentioned combined offshore six-pontoon pontoon foundation structure is carried out according to the following steps:

(1) Prefabricated structure: The onshore factory prefabricated and processed each component, and installed the buoy 1, pontoon 2, and transition section tower 3 into one combined offshore six-pontoon pontoon basic structure.

(2) Preliminary adjustment preparation: After sealing the bottom cover 17 of each buoy 1, the basic structure of the combined offshore six buoy buoy box is hoisted to the sea surface, sunk to a certain depth by the self-weight of the basic structure, and adjusted according to the draft required for towage When the draft is not enough, the inside of the buoyancy tank 2 is filled with water and ballasted. When the draft is too large, the lower structure of the buoy 1 is inflated to increase the displacement or the buoyancy tank 2 is inflated to discharge a certain amount of ballast water to reduce the dead weight.

(3) Water consignment: Use tugboat equipment to tow the basic structure of the combined offshore six-pontoon buoy box at a single point through towing cables. The mooring point is arranged on one or two of the buoys 1, generally flush with the water surface The speed should not be too fast.

Before towing, it is necessary to fill and ballast the interior of the other five or four buoys 1, so that the structure has a certain backward tilt angle, and the buoys 1 at the mooring points will have a relatively obvious bow during the overall towage process. phenomenon, so the initial backward tilt angle can neutralize the forward tilt phenomenon formed by sinking the head, so as to ensure the stability requirements during the hauling process and reduce the dynamic response.

(4) Water entry of the foundation: After consignment to the designated location, sink and install, fill the lower structure of the buoy 1 with water until the bottom cover 17 of the buoy can be removed, then fill the tank of the buoy 2 with water, and the self-weight of the foundation structure increases, so that the foundation structure is further lowered Sink until the tube skirt 13 of the buoy 1 and the anti-skid skirt 25 of the pontoon 2 contact the seabed.

(5) Negative pressure sinking: After the tube skirt 13 of the buoy 1 and the anti-skid skirt 25 of the buoy 2 are inserted into the foundation to a certain depth, the lower structure of the buoy 1 is pumped, and the foundation structure sinks further until the top cover 11 of the buoy and the buoy. The bottom plate 22 of the box fully contacts the mud surface, continues to pump water to the lower structure of the buoy 1 for a period of time, and carries out negative pressure reinforcement treatment to the soil.

During the negative pressure sinking process, when the soil quality is uneven or the pumping rate of the lower structure of buoy 1 is inconsistent, the sinking depth of each buoy 1 will be different, which will cause the foundation structure to incline. Therefore, a leveling operation is required. The substructure of the buoy 1 increases the pumping rate and/or inflates or fills the substructure of the buoy 1 in a downward slope for leveling operations.

(6) Grouting and ballasting: After the negative pressure reinforcement is completed, the inside of the buoyancy tank 2 is grouted through the grouting pipes of the vertical rod 31 and the oblique rod 33, and the upper structure of the buoyant drum 1 can be ballasted by riprap or grouted. load.

(7) Install the upper structure: After the grouting treatment is completed, the upper wind power equipment is hoisted and installed on the water.

(8) Recycling: first remove and hoist the upper wind power equipment, and then fill or inflate the skirt 13 of the buoy 1 with water through the gas-liquid pipeline inside the vertical rod 31 to increase the internal pressure; The anti-skid skirt 25 of the box 2 is injected with water or inflated to increase the internal pressure, so that the skirt 13 of the buoy 1 and the anti-skid skirt 25 of the pontoon 2 are separated from the foundation, the buoyancy is further increased, and the entire basic structure floats slowly. After reaching the sea, it can be towed back to land by tugboat.

Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are only illustrative and not restrictive. Those of ordinary skill in the art Under the enlightenment of the present invention, without departing from the purpose of the present invention and the scope of protection of the claims, personnel can also make specific changes in many forms, and these all belong to the protection scope of the present invention.

Claims (10)

1. a combined six buoy buoy buoy box foundation structure on the sea is characterized in that, comprises six identical buoys, six identical buoys and a transition section tower; Arranged in a regular hexagon in succession, every two adjacent buoys are connected by one buoyant tank, the center line of the buoyant tank along the length direction passes through the axes of the buoys at its two ends; Connect the transition section tower with the upper part of the buoyancy tank, and the transition section tower is used to connect the upper wind power equipment; The buoy is composed of a buoy top cover, a tube wall, a tube skirt, radial ribs, circumferential ribs, compartment plates, and a buoy bottom cover; the upper edge of the buoy top cover is provided with the tube wall, and the lower edge is provided with the tube skirt; the buoy top cover and the tube wall constitute the superstructure of the buoy, and the radial ribs and the circumferential ribs are arranged in the superstructure of the buoy; the buoy top cover and the The skirt constitutes the lower structure of the buoy, and a subdivision plate is arranged in the lower structure of the buoy, and the subdivision plate divides the lower structure of the buoy into four to seven mutually sealed compartments; the bottom cover of the buoy It is used to be packaged on the bottom surface of the substructure of the buoy during the floating process; The buoyant tank is composed of a buoyant tank top plate, a buoyant tank bottom plate, a side plate, an upper rib plate, an anti-slip skirt plate, and a lower rib plate, and the buoyant tank top plate, the buoyant tank bottom plate, and the side plate form a cuboid cavity The casing of the structure, the inside of the casing of the buoyant tank is provided with a plurality of horizontal and vertical upper ribs, and the upper ribs of the plurality of pieces divide the casing of the buoyant tank into interconnected areas; the buoyant tank Air holes are preset at both ends of the top plate, and water holes are preset at both ends of the bottom plate of the buoyant tank, and the water filling and drainage inside the box body of the buoyant tank are realized by using the air holes and the water holes through gas-liquid replacement; The anti-slip skirt is provided on the lower edge of the bottom of the pontoon, and a lower rib is arranged in the space formed by the bottom of the pontoon and the anti-slip skirt; The tower of the transition section is composed of six identical uprights, several support rods, and twelve oblique rods; the bottom ends of the six uprights are poured into the centers of the buoy top covers of the six buoys respectively and welded together with them, and all Inclining towards the center of the foundation structure at the same angle from bottom to top; multiple support rods are connected between the six columns to form a truss-type steel structure; the diagonal rods are connected between the columns and the adjacent buoys Between, the lower end of the slanting rod is connected to the interior of the pontoon from the center of the top plate of the pontoon, and the inside of the slanting rod is provided with a gas-liquid pipeline extending below the bottom of the pontoon; each of the columns is respectively provided with Gas-liquid pipeline, grouting pipeline and liquid level detection device, wherein the gas-liquid pipeline extends from the column to below the buoy top cover of the buoy, wherein the grouting pipeline extends from the column to the upper structure of the buoy and the buoy Inside the box body of the tank, the liquid level detection device is used to judge the air pressure state in the buoy corresponding to the bottom of the column by observing the change of the liquid level of the liquid after the liquid seal inside the column during the towing process. 2. A kind of combined offshore six-pontoon pontoon basic structure according to claim 1, characterized in that, the total height of the buoy is consistent with the buoy, the wall of the buoy is consistent with the height of the tube skirt, so The side plate of the pontoon is at the same height as the anti-skid skirt, the cylinder wall of the buoy is at the same height as the side plate of the pontoon, and the skirt of the buoy is at the same height as the anti-skid skirt of the pontoon. 3. A kind of combined offshore six-pontoon pontoon foundation structure according to claim 1, characterized in that, the subdivision plate of the buoy divides the lower structure of the buoy into an intermediate compartment and a side compartment, and the middle compartment The cabin is a circle or a regular polygon, and the number of the side cabins is an even number. 4. A combined offshore six-pontoon pontoon foundation structure according to claim 1, characterized in that the lower ribs of the pontoon are cross-shaped partitions. 5. A combined offshore six-pontoon pontoon foundation structure according to claim 1, characterized in that grouting pipes are arranged inside the inclined rods. 6. a construction method as described in any one of claim 1-5 combined six pontoon pontoon foundation structure at sea, it is characterized in that, carry out according to the following steps: (1) each component is prefabricated and processed by the land factory, and the combined offshore six buoy buoy box basic structure is installed into one by the buoy, the buoy box, and the transition section tower; (2) After sealing the bottom cover of the buoy at the bottom of the buoy, the basic structure of the combined offshore six buoy buoy box is hoisted to the sea surface, and the basic structure is sunk by its own weight and adjusted according to the draft required for towing; (3) Floating and towing the basic structure of the combined offshore six-pontoon pontoon; (4) The basic structure of the combined offshore six-pontoon pontoon is consigned to the designated location and then sinks for installation. The lower structure of the pontoon is filled with water until the bottom cover of the pontoon is removed, and then the box of the pontoon is filled with water to make the basic structure The self-weight increases, and the foundation structure sinks further until the skirt of the buoy and the anti-skid skirt of the buoy touch the seabed; (5) After the skirt of the buoy and the non-slip skirt of the buoy are inserted into the foundation, pump water to the lower structure of the buoy to further sink the foundation until the top cover of the buoy and the bottom plate of the buoy Completely contact the mud surface, and continue to continuously pump water to the substructure of the buoy to carry out negative pressure reinforcement treatment to the soil; (6) After the negative pressure reinforcement is completed, use the grouting pipeline to grout the inside of the buoyant box, and perform riprap ballast or grouting ballast on the upper structure of the buoy; (7) After the grouting treatment is completed, the upper wind power equipment is hoisted and installed on the water, and the construction is completed. 7. the construction method of a kind of combined offshore six-pontoon pontoon foundation structure according to claim 6, is characterized in that, the draft described in step (2) is adjusted according to the draft required by towage, specifically by adjusting the The internal ballast volume of the tank of the pontoon or the displacement of the substructure of the buoy is carried out. 8. the construction method of a kind of combined offshore six-pontoon pontoon foundation structure according to claim 6, is characterized in that, the floating towage described in step (3) adopts single-point or two-point towage, and in Before consignment, carry out water-filled ballast to the interior of the other five or four buoys except for the buoy where the mooring point is arranged, so that the foundation structure has a recoil angle for neutralizing the bowing phenomenon. 9. The construction method of a combined offshore six-pontoon pontoon foundation structure according to claim 6, characterized in that, in the negative pressure sinking process described in step (5), the buoys on the up-tilted The substructure increases the pumping rate and/or inflates or fills the substructure of the pontoon with water in a downward slope, performing leveling operations. 10. The construction method of a combined offshore six-pontoon pontoon foundation structure according to claim 6, characterized in that, when recycling, the upper wind power equipment is first dismantled and hoisted, and secondly, the gas-liquid pipeline inside the vertical rod is used to The inside of the skirt of the buoy is filled with water or inflated to increase the internal pressure, and the inside of the anti-skid skirt of the buoy is injected with water or inflated to increase the internal pressure through the gas-liquid pipeline inside the inclined rod, so that the The tube skirt and the anti-skid skirt of the pontoon are separated from the foundation, and after the entire foundation structure slowly floats to the sea surface, it is towed back to land by a tugboat.