CN110043029A - The precompressed water tank and pre-pressing process of huge laced beam steel pipe full framing - Google Patents

Abstract

The invention relates to the technical field of building construction, and discloses a water tank preloading process for a giant hollow beam steel tube full-floor support, including the following operation processes: erecting a full-floor support → selecting a preloading area → determining a preloading load → setting up a water tank → monitoring point layout → monitoring Instrument setting→water storage grading loading→preload monitoring→settlement stabilization→drainage unloading→adjustment of support template→next process. By using the simple equipment standing on site and configuring the water tank by yourself, it is flexible and simple, with high work efficiency, and the construction period can be shortened by more than 1/3 compared with the traditional piling preloading method; the processing cost is low, the operation is simple, and the cost is saved, which is more efficient than using prefabricated reinforced concrete blocks. The pressing method can save 70~80% of investment, 30~40% investment compared with stacking sandbag pre-pressing, and 20%~30% investment compared with on-site reinforced material pre-pressing. This pre-pressing method has the advantages of less construction equipment and higher construction efficiency. It has the advantages of high height, local materials, simple production, environmental protection construction, and reasonable simulation of the actual stress state during the pouring process.

Description

Pre-pressing water tank and pre-pressing technology of giant hollow beam steel tube full support

technical field

The invention relates to the technical field of building construction, in particular to a pre-pressed water tank of a giant hollow beam steel tube full of supports.

Background technique

In the process of large-span cast-in-place giant hollow beam concrete pouring, the stability and deformation of the support directly affect the safety and quality of the hollow beam concrete pouring.

The purpose of bracket preloading is to test the safety of the bracket and collect construction settlement data. After preloading, the strength, stiffness and safety of the bracket can be tested to ensure construction safety; the influence of the inelastic deformation of the bracket can be eliminated, and the elastic deformation data can be mastered , the pre-camber setting is reasonable, which is beneficial to the linear control of the hollow beam members. The pre-compression load of the existing brackets is commonly selected from the pre-compression of prefabricated reinforced concrete blocks, water bag pre-compression, stacking sand bag pre-compression, or on-site steel material pre-compression, etc. Method, the use of prefabricated reinforced concrete blocks preloading needs to use a crane to place the prefabricated reinforced concrete blocks on the support in batches. During the placement process, the prefabricated reinforced concrete blocks are preloaded due to different weights and areas. The preloading of the reinforced concrete blocks is uncomfortable Evenly arranged on the bracket, the preloading force of the bracket is uneven, and the phenomenon of partial preloading overload occurs. The preloading of the water bag also requires handling equipment to stack it on the bracket. The preloading method of the water bag is easy to cause the bracket. The eccentric load during preloading will affect the accuracy after the test. The use of on-site steel bar material for preloading requires a lot of materials and manpower. In summary, these methods require a lot of labor and hoisting equipment, resulting in serious waste of materials and construction. The time is long, which is not only labor-intensive and time-consuming, but also has certain restrictions on the pre-pressing site.

SUMMARY OF THE INVENTION

In view of the deficiencies of the above background technology, the present invention provides a pre-pressed water tank with a giant hollow beam steel tube full support, which has the advantages of saving resources, shortening the construction period, and being easy to operate, and solves the problems raised by the background technology.

The present invention provides the following technical solutions: a water tank pre-pressing process for a giant hollow beam steel tube full support, including the following operation processes: erecting a full support → selecting a pre-pressing area → determining a pre-loading load → setting up a water tank → monitoring point arrangement → monitoring instrument setting → storage Water stage loading→preload monitoring→settlement stabilization→drainage unloading→adjustment of support template→next process;

First of all, the water tank is designed and manufactured on the completed steel pipe full-house support. When erecting, the on-site scaffolding is directly used. The main body of the water tank is built with wooden squares. The wooden square is used as the secondary corrugation, the main corrugation is transversely reinforced by double steel pipes, the box is covered with waterproof cloth, and the screw rod adopts a new type of waterproof double-pull screw (with waterproof plugging); The box body is made of wood panel material. After the box body is made, the monitoring points and monitoring instruments are arranged according to the requirements. The water pump is directly applied to the box body to apply pressure. When the application of each level of load is completed, the elevation of each monitoring point is monitored and the settlement amount is calculated. , After all preload loads are applied, monitor and record the elevation of each monitoring point every 24 hours. When the preload of the support meets the preload qualification, unload the support. After unloading for 6 hours, monitor the elevation of each monitoring point and calculate the support. The elastic deformation of each monitoring point, during the loading process, the support preload monitoring for 36 hours cannot meet this requirement, the support should be checked again and safety inspection should be carried out, and the preload time can be extended or other treatment methods can be taken according to the actual situation.

The pre-pressed water tank of the giant hollow-beam steel tube full bracket, including the steel tube full bracket, the wooden square, the wooden panel, the tarpaulin, and the new waterproof pull screw, the wooden frame, the wooden panel, the waterproof cloth, and the new waterproof pull screw constitute the water tank. The wooden square is arranged on the outermost side of the water tank, the wooden panel is arranged in the middle of the water tank, and the waterproof cloth is arranged on the innermost side of the water tank. A rubber ring located on the inner side of the water tank is installed on the new waterproof pair of pull screws, throwing bars are arranged on both sides of the water tank, and a monitoring device located below the water tank is installed on the steel pipe full bracket.

Preferably, the preloading of the water tank adopts graded loading, and the pressure is applied according to the preloading load of 0%→60%→80%→100%. After each stage of loading is completed, the next stage of loading is stopped first, and every 12 hours. The settlement of the support is monitored once. When the average settlement of the monitoring point at the top of the support for 12 hours is less than 2mm, the next level of loading can be performed. The preloading of each stage of loading is recorded. After the requirements of the specification, it can be drained and unloaded at one time.

Preferably, the bottom area of the water tank is not less than the actual projection surface of the to-be-cast-in-situ structural beam, the water head height is calculated from the preloading load, and the preloading range of the support should not be smaller than the actual projection surface of the cast-in-place concrete structure.

Preferably, the value of the preloading load of the support should not be less than 1.1 times the sum of the dead load of the concrete structure and the weight of the formwork that the support bears. The load strength in the preloading unit can be divided by the weight of the preloading load in the preloading unit The pressure cell area is obtained.

Preferably, the settlement monitoring points of the support should be arranged with a monitoring section every 1/4 of the span along the longitudinal direction of the concrete structure, and the monitoring points on each monitoring section should not be less than 5, and should be arranged symmetrically, and the support settlement monitoring Points should be placed at corresponding positions on the top and bottom of the bracket.

The present invention has the following beneficial effects:

1. The pre-pressing water tank of the giant hollow beam steel pipe full-house bracket is equipped with the water tank by using the simple equipment standing on the construction site, which is flexible and simple, and has high work efficiency. Compared with the traditional stacking pre-pressing method, the construction period can be shortened by more than 1/3; the processing cost is low , Easy to operate, cost saving, 70~80% investment compared with prefabricated reinforced concrete block preloading method, 30~40% investment saving compared with stacking sandbag preloading, 20% investment saving compared with on-site reinforced material preloading~ 30%, this preloading method has the advantages of less construction equipment, high construction efficiency, local materials, simple production, environmental protection construction, and reasonable actual stress state during the simulation of the pouring process. The problem of long and narrow surface meets the testing requirements of the bearing capacity and deformation of the support, shortens the construction period and saves costs.

2. The pre-pressing water tank of the giant hollow-beam steel tube full-house bracket has been pre-pressed to check the stability of the bracket, eliminate the inelastic deformation of the bracket, and adjust the pre-camber value of the bracket according to the elastic deformation data in the pre-load report. It is ensured that the deformation of the bracket during the concrete pouring process is within the allowable range. In the specific operation process, the present invention has no special requirements for construction materials and processes.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Figure 2 is a schematic diagram of the use flow of the present invention.

In the picture: 1. Steel pipe full house bracket; 2. Wooden square; 3. Wooden panel; 4. Waterproof cloth;

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Please refer to Figure 1-2, the water tank preloading process of the giant hollow beam steel tube full support, including the following operation processes: erecting the full support → selecting the preloading area → determining the preloading load → setting up the water tank → monitoring point layout → monitoring instrument setting → storage Water stage loading→preload monitoring→settlement stabilization→drainage unloading→adjustment of support formwork→next process, the pre-pressed water tank is made on the original support on site, which can better solve the problem of high support ballast accumulation and failure in the case of limited beam width. Stability problem, the force simulation of the entire support system is good, the preloading process is close to the actual force state, the construction is environmentally friendly, pollution-free, and will not have a great impact on the surrounding environment;

First of all, the water tank is designed and manufactured on the completed steel pipe full-house support. The water tank can be arranged according to the actual projected area of the large-span structural beam, the upper engineering structure form, and the load size, etc., with flexibility and adaptability. The main body is built with wooden squares, the bottom form of the water tank is made, and the formwork on both sides is made; the outer sides of the formwork on both sides of the water tank are made of vertical wooden squares as secondary corrugations, the main corrugation is transversely reinforced by double steel pipes, the inside of the box is covered with waterproof cloth, and the screws are made of New waterproof paired screw (with waterproof plug); additional rubber pads and waterproof glue are added at the perforations at both ends of the screw to seal tightly. The box is made of wood panel material. After the box is made, the monitoring points and placement monitoring are arranged as required. For the instrument, use the water pump to directly irrigate the box with pressure. The pump lift is selected to be about 1.15 to 1.20 times the water lifting height. The water source can be directly taken from the construction site sump or tap water. A drain pipe with a diameter of 75 is set at the highest head position. , when the water level exceeds the limit height, the water is automatically discharged. The two ends of the water tank are set up separately, and the pipeline can be connected with the drainage pipe at the bottom of the tank. When the application of each level of load is completed, the elevation of each monitoring point is monitored and the settlement amount is calculated. Monitor once every 24 hours and record the elevation of each monitoring point. When the preloading of the support meets the preloading requirements, the support is unloaded. The loading and unloading in the preloading is symmetrical and balanced, which can avoid the adverse effect of partial load on the support. After unloading for 6 hours , monitor the elevation of each monitoring point, and calculate the elastic deformation of each monitoring point of the support. During the loading process, the support preload monitoring for 36 hours cannot meet this requirement, and the support should be checked again and the safety inspection should be carried out. The preload time can be extended according to the actual situation. or take other treatment methods.

The pre-pressurized water tank of the giant hollow beam steel tube full support, including the steel tube full support 1, in order to prevent the support foundation from reducing the bearing capacity when it encounters water, the support foundation should be waterproof and drainage work; different types of supports should be based on the project structure. Select a representative area for pre-compression, determine the pre-compression range, wood square 2, wood panel 3, waterproof cloth 4, new waterproof pull screw 5, water tank bottom mold, side mold, new waterproof Structural components such as the pull screw 5 should be determined by calculation, and should meet the requirements of bearing capacity, stiffness and stability. The wooden square 2, the wooden panel 3, the waterproof cloth 4, and the new waterproof pair of the pull screw 5 constitute a water tank, and the wooden square 2 is located in the water tank. On the outermost side of the water tank, the wooden panel 3 is located in the middle of the water tank, and the waterproof cloth 4 is located at the innermost side of the water tank. A rubber ring 8 is installed on the inner side of the water tank, and there are throwing rods 6 on both sides of the water tank. A monitoring device 7 located under the water tank is installed on the steel pipe full bracket 1. The content monitored by device 7 is the elevation of the monitoring point before loading, the elevation of the monitoring point after each level of loading, the elevation of the monitoring point every 24 hours after loading to 100%, and the elevation of the monitoring point after 6 hours of unloading. The height of the water head (the weight of water is 10KN/m3), the height of the water tank should be 10CM~30CM higher than the height of the water head, and the bottom area of the water tank should be determined not less than the actual projection surface of the cast-in-place concrete structure.

Among them, the preloading of the water tank adopts staged loading, and the preloading load is 0%→60%→80%→100% respectively. After each stage of loading is completed, the next stage of loading is stopped first, and the settlement of the support is measured every 12 hours. Carry out one monitoring, when the 12-hour average settlement of the monitoring point at the top of the support is less than 2mm, the next level of loading can be performed, and the monitoring data records are made for the preloading of each level of loading. After that, it can be drained and unloaded at one time, and the preloading of the support should be carried out after the preloading of the support foundation is qualified.

Among them, the bottom area of the water tank is not less than the actual projection surface of the to-be-cast-in-situ structural beam, the water head height is calculated from the preloading load, and the preloading range of the support should not be smaller than the actual projection surface of the cast-in-place concrete structure.

Among them, the value of the preloading load of the support should not be less than 1.1 times the sum of the dead load of the concrete structure and the weight of the formwork that the support bears. It is obtained that the load in the same preloading unit is uniformly distributed, which is convenient for construction loading.

Among them, the arrangement of the settlement monitoring points of the support should be arranged along the longitudinal direction of the concrete structure with a monitoring section every 1/4 of the span. The monitoring points on each monitoring section should not be less than 5, and should be arranged symmetrically. The support settlement monitoring points should be at The top and bottom of the support are arranged at the corresponding positions, and the monitoring preload is qualified when the average settlement of each monitoring point in the first 24 hours is less than 1mm, and the average settlement of each monitoring point in the first 72 hours is less than 5mm.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. the water tank pre-pressing process of huge laced beam steel pipe full framing, it is characterised in that: including following operating procedure: Man Tangzhi Frame, which is set up, → selecting precompressed region → determines that prefabricating load → water tank sets up → monitoring point arrangement → monitoring instrument setting → water storage Hierarchical loading → precompressed monitoring → settlement stability → draining unloads → adjusts rack template → next procedure；

It has set up first and has designed and produced water tank on the steel pipe full framing of completion, directly carried out using live scaffold when setting up, Water tank main body is built using flitch, makes water tank bed die, in the production for carrying out two side templates；With perpendicular on the outside of two side template of water tank Secondary stupefied to flitch work, stupefied master is double steel pipe transversely strengthening, and paving waterproof cloth in cabinet, screw rod uses new waterproof Screw arbor with nut at both-ends (certainly Band waterproof blocks)；It is tight that the closure such as rubber mat, marine glue are separately added at the perforation of screw rod both ends, cabinet uses wooden boards material, cabinet Monitoring point and placement monitoring instrument are arranged after completing as required, is directly poured water pressure to cabinet with water pump, every grade of load is applied It when adding into, monitors each monitoring point absolute altitude and calculates settling amount, after whole prefabricating loads apply, monitored at interval of 24 hours Once and each monitoring point absolute altitude is recorded, when pre-pressing bracket meets precompressed qualification, carries out bracket unloading, after unloading 6 hours, monitoring Each monitoring point absolute altitude, and the elastic deformation amount of each monitoring point of bracket is calculated, in loading procedure, pre-pressing bracket monitoring 36h cannot expire This regulation of foot should carry out checking computations and safety verification to bracket again, can extend according to the actual situation squeeze time or take other Processing method.

2. the precompressed water tank of huge laced beam steel pipe full framing, it is characterised in that: including steel pipe full framing (1), flitch (2), wooden boards (3), waterproof cloth (4), new waterproof Screw arbor with nut at both-ends (5), the flitch (2), wooden boards (3), waterproof cloth (4), New waterproof Screw arbor with nut at both-ends (5) constitutes water tank, and the flitch (2) is located at the outermost of water tank, and the wooden boards (3) are located at water tank Middle part, the waterproof cloth (4) is located at the most inner side of water tank, and the flitch (2), wooden boards (3), waterproof cloth (4) pass through novel Water-proof double-unit screw (5) connects, the rubber ring (8) being equipped on the inside of water tank on the new waterproof Screw arbor with nut at both-ends (5), institute The two sides for stating water tank, which are equipped with, throws bar (6), the monitoring device (7) being equipped with below water tank on the steel pipe full framing (1).

3. the water tank pre-pressing process of huge laced beam steel pipe full framing according to claim 1, it is characterised in that: described Water tank precompressed uses hierarchical loading, presses respectively by prefabricating load 0% → 60% → 80% → 100%, after the completion of every grade of load, first stops Only next stage loads, and is once monitored at interval of 12 hours to bracket settling amount, when cradle top monitoring point 12 is small When settling amount average value is less than 2mm, next stage load can be carried out, every grade of load precompressed performs monitoring data record, examines in precompressed Measured data can disposably drain unloading after reaching design and the requirement in relation to standardizing.

4. the water tank pre-pressing process of huge laced beam steel pipe full framing according to claim 1, it is characterised in that: described Water tank floor space is not less than the quasi- practical perspective plane of cast-in-place structural beam, and head height show that pre-pressing bracket adds by prefabricating load conversion Carry the practical perspective plane that range is no less than cast-in-place concrete structure object.

5. the water tank pre-pressing process of huge laced beam steel pipe full framing according to claim 1, it is characterised in that: described Pre-pressing bracket Load value is no less than 1.1 times of the concrete structure dead load that bracket is born and the sum of template weight, precompressed list First internal loading intensity can be obtained according to prefabricating load weight in its prepressing units divided by prepressing units area.

6. the water tank pre-pressing process of huge laced beam steel pipe full framing according to claim 1, it is characterised in that: described The settlement monitoring point arrangement of bracket should be longitudinal every 1/4 span setting, one monitoring section along concrete structure, and each monitoring is disconnected Monitoring point on face should not be less than 5, and should be arranged symmetrically, and bracket settlement monitoring point should be in cradle top and bottom corresponding position On be respectively arranged.