Pile foundation reinforcement cage in-hole fixing device and construction method

Abstract

The invention relates to the technical field of pile foundation construction, and provides a pile foundation reinforcement cage in-hole fixing device and a construction method, and the pile foundation reinforcement cage in-hole fixing device comprises an air compressor, an air delivery pipe, a valve group, a buoyancy air bag, a supporting balance air bag and a guide cage fixing system. The problem that the reinforcement cage cannot be fixed under the special working conditions such as complex geology, limited space and full pile casing follow-up is solved through buoyancy generated by the buoyancy air bag in mud in combination with rigid constraint of the guide cage fixing system. The guide cage fixing system is formed by welding lifting points, guide cage main reinforcements, restraining reinforcements and guide cage stirrups, the restraining reinforcements are arranged in an equilateral triangle shape to limit movement of the buoyancy air bag, and it is guaranteed that the reinforcement cage is erected and the center position is accurate.

Description

Technical Field

[0001] The present invention belongs to the technical field of pile foundation construction, and particularly relates to a device and construction method for fixing a pile foundation steel reinforcement cage in a hole. Background Art

[0002] Currently, in pile foundation construction, the fixation of the steel reinforcement cage is a key link to ensure the project quality. Traditional methods usually use suspension bars welding or steel profiles to fix the top of the steel reinforcement cage on the steel casing to ensure the verticality of the steel reinforcement cage, prevent the bottom end from contacting the hole bottom, and ensure that the thickness of the protective layer meets the design requirements. However, in special cases such as complex geological conditions (such as karst caves, faults, quicksand), limited construction site space, or the use of the full casing following process, the traditional fixation method is difficult to implement, resulting in problems such as the steel reinforcement cage contacting the hole bottom, twisting and deforming, or deviation, which in turn causes uneven thickness of the protective layer of the pile foundation steel reinforcement cage, too small local protective layer thickness, and deviation of the steel reinforcement cage, affecting the durability and safety of the pile foundation.

[0003] Therefore, there is an urgent need for a device that can stably fix the steel reinforcement cage under special working conditions to solve the deficiencies in the prior art. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a device and construction method for fixing a pile foundation steel reinforcement cage in a hole. Through the cooperation of the buoyancy of the floating airbag and the cage guiding and fixing system, the problem of the inability to fix the steel reinforcement cage under special working conditions is solved, and the verticality, the thickness of the protective layer, and the central position of the steel reinforcement cage are ensured to meet the design requirements.

[0005] To achieve the above object, the present invention provides the following technical solutions: In the first aspect, the present invention proposes a device for fixing a pile foundation steel reinforcement cage in a hole, including: an air compressor, an air delivery pipe, a valve group, a floating airbag, a support and balance airbag, and a cage guiding and fixing system; the air compressor is connected to the floating airbag and the support and balance airbag through the air delivery pipe; the valve group is distributed on the air delivery pipe; the cage guiding and fixing system is of a cage structure and is arranged in the pile foundation hole; the pile foundation steel reinforcement cage is suspended and connected below the cage guiding and fixing system to form a traction steel reinforcement cage combined structure; the cage guiding and fixing system is configured with a chamber, and the floating airbag is arranged in the chamber; the buoyancy of the floating airbag in the expanded state in the pile foundation hole is greater than the self-weight of the cage guiding and fixing system and the pile foundation steel reinforcement cage; there are multiple support and balance airbags, which are distributed between the cage guiding and fixing system and the pile foundation hole; the valve group adjusts the inflation and deflation of the multiple support and balance airbags through the opening and closing of the valves to adjust the verticality of the traction steel reinforcement cage combined structure in the pile foundation hole.

[0006] Furthermore, the cage fixing system includes cage main reinforcement bars, restraint bars, and cage stirrups; a plurality of the cage main reinforcement bars are arranged at intervals along the circumference of the pile foundation steel cage, the lower ends of the cage main reinforcement bars are connected to the pile foundation steel cage, and the upper ends of the plurality of cage main reinforcement bars are connected to the restraint bars to form an integral structure; the cage stirrups are connected to the plurality of cage main reinforcement bars by hoop connection; the cage main reinforcement bars, the restraint bars, and the cage stirrups enclose to form the chamber.

[0007] Furthermore, the cage fixing system further includes a lifting point, and the lifting point is arranged at the upper end of the cage main reinforcement bar.

[0008] Furthermore, there are a plurality of the cage stirrups, and the plurality of cage stirrups are arranged at intervals along the height direction of the cage main reinforcement bars.

[0009] Furthermore, there are three restraint bars, and the three restraint bars are arranged in a horizontal equilateral triangle at the top of the floating air bag; the cage main reinforcement bars are connected below the intersection points where every two restraint bars are connected.

[0010] Furthermore, the cage fixing system further includes a positioning assembly; the positioning assembly includes a cage positioning ring, a diagonal bracing bar, and a cage positioning disc; the cage positioning ring is fixedly arranged inside the three restraint bars by internal tangency, a cage positioning disc is concentrically arranged above the cage positioning ring, and the diagonal bracing bar is connected between the cage positioning disc and the cage positioning ring; a cage positioning hole is arranged at the center of the cage positioning disc, and the center of the cage positioning hole is located on the central axis of the pile foundation steel cage.

[0011] Furthermore, the positioning assembly further includes a plumb line and a plumb bob suspended at the lower end of the plumb line; the lower end of the plumb line passes through the cage positioning hole; the plumb bob is suspended below the cage positioning disc; both the upper end and the lower end of the plumb bob are conical.

[0012] Furthermore, the pile foundation steel cage includes cage stirrups, and cage internal bracing bars arranged in an equilateral triangle are arranged inside the cage stirrups; the positioning assembly further includes a steel cage positioning ring, the steel cage positioning ring is arranged inside the pile foundation steel cage and connected to the cage internal bracing bars, and the center of the steel cage positioning ring is located on the central axis of the pile foundation steel cage.

[0013] Furthermore, there are three groups of the cage main reinforcement bars, and each group of the cage main reinforcement bars includes two vertical steel bars arranged at intervals along the circumference of the cage stirrups.

[0014] Furthermore, a plurality of buckles are provided on the back surface of the support balance airbag; a connecting grid is provided between the two vertical steel bars of each main reinforcement bar of the cage; the connecting grid includes transverse steel bars arranged at intervals along the height direction of the main reinforcement bar of the cage; the back surface of the support balance airbag abuts against the connecting grid, and the buckles are buckled on the transverse steel bars.

[0015] Furthermore, the air delivery pipe is communicated with the center of the top of the floating airbag.

[0016] Furthermore, the valve is a ball valve.

[0017] Furthermore, a pressure gauge is also provided on the air delivery pipe.

[0018] Furthermore, the floating airbag is a cylindrical flexible inflatable component.

[0019] In a second aspect, the present invention also provides a construction method for a pile foundation steel cage, which is constructed by using the pile foundation steel cage fixing device in the hole described above. The method includes the following steps: Step 1: Install and lower the pile foundation steel cage in sections into the pile foundation hole. Step 2: Assemble and weld the cage fixing system of the fixing device, and assemble and weld the cage fixing system with the pile foundation steel cage at the construction site to form a traction steel cage combined structure, and use a crane to place the traction steel cage combined structure in the pile foundation hole. Step 3: Place the non-inflated floating airbag in the chamber of the cage fixing system. Step 4: Assemble an air compressor, an air delivery pipe and a valve group, and communicate the air delivery pipe with the floating airbag and the support balance airbag. Step 5: Install a plurality of the support balance airbags between the cage fixing system and the pile foundation hole, and open the valve in the valve group that is communicated with the support balance airbag to realize the fixation and preliminary positioning of the traction steel cage combined structure in the pile foundation hole. Step 6: Open the valve in the valve group that is communicated with the floating airbag, use the buoyancy of the floating airbag to keep the pile foundation steel cage standing at its designed height, and remove the crane hook. Step 7: Carry out linkage regulation on the air pressures of a plurality of the support balance airbags to realize the final calibration of the elevation and verticality of the pile foundation steel cage.

[0020] Furthermore, in the step 2, the step of using a crane to place the traction steel cage combined structure in the pile foundation hole includes: Connect the top of the cage fixing system with the crane hook, and hoist the combined structure of the traction steel reinforcement cage into the pile foundation hole; use a plumb line and a plumb bob suspended below the plumb line, lower the plumb bob to the center of the pile foundation steel reinforcement cage, control the verticality of the combined structure of the traction steel reinforcement cage by the plumb line dropping method, and control the elevation of the combined structure of the traction steel reinforcement cage by a level, so that the combined structure of the traction steel reinforcement cage stands upright in the pile foundation hole; In the fifth step, the steps to realize the fixation and preliminary positioning of the combined structure of the traction steel reinforcement cage in the pile foundation hole include: Lift the plumb line so that the plumb bob is suspended at the orifice of the pile foundation hole and above the combined structure of the traction steel reinforcement cage; use an air compressor to inflate multiple support and balance air bags simultaneously, so that the support and balance air bags expand and squeeze between the cage fixing system and the pile foundation hole; control the verticality and elevation of the combined structure of the traction steel reinforcement cage by the plumb line dropping method and a level.

[0021] The beneficial effects of the present invention are as follows: By supporting between the cage fixing system and the pile foundation hole with the support and balance air bags, it is convenient for the temporary support, fixation and positioning of the combined structure of the traction steel reinforcement cage in the pile foundation hole; it is also convenient to adjust the verticality of the combined structure of the traction steel reinforcement cage, and combine with the floating air bag to realize the elevation control of the combined structure of the traction steel reinforcement cage. Support the pile foundation steel reinforcement cage by the buoyancy of the floating air bag, avoid relying on the steel casing in the traditional fixing method, and are applicable to special working conditions such as complex geology, limited space and full casing follow-up. The cage fixing system forms a rigid cage structure with compartments through the restraint bars, the main cage bars and the cage stirrups, effectively restricts the movement of the floating air bag and evenly transmits the buoyancy, ensures the erection of the pile foundation steel reinforcement cage and the accurate center position, and solves the problems of distortion and deviation. The valve group realizes the precise control of the air pressure of the floating air bag and the support and balance air bag, and is equipped with a pressure gauge to monitor the air leakage situation in real time, ensuring the reliability of the fixing device. The connection methods of the components of the fixing device are simple, the structural strength is high, and it can be reused, reducing the construction cost. Description of the Drawings

[0022] Figure 1 It is a structural schematic diagram of hoisting the combined structure of the traction steel reinforcement cage of the in-hole fixing device of the pile foundation steel reinforcement cage of the present invention into the pile foundation hole; Figure 2 is Figure 1 a structural schematic diagram of the floating air bag in the cage fixing system being fully inflated; Figure 3 It is a structural schematic diagram of the cage fixing system of the present invention; Figure 4 It is a top view structural schematic diagram of the cage fixing system of the present invention; Figure 5 It is a structural schematic diagram of the back buckle of the support and balance air bag of the present invention being connected with the connection grid.

[0023] In the figure: 1 - air compressor; 2 - air delivery pipe; 3 - pressure gauge; 4 - valve group; 5 - support balance airbag; 6 - floating airbag; 7 - lifting point; 8 - main reinforcement bars of the cage for guiding the cage; 9 - restraint bars; 10 - stirrups of the cage for guiding the cage; 11 - vertical steel bars; 12 - steel cage of the pile foundation; 13 - stirrups of the steel cage; 14 - internal bracing bars of the steel cage; 15 - positioning ring of the steel cage; 16 - buckle; 17 - connecting grid; 18 - positioning ring of the cage for guiding the cage; 19 - diagonal bracing bars; 20 - positioning plate of the cage for guiding the cage; 21 - positioning holes of the cage for guiding the cage; 22 - suspension line; 23 - plumb bob; 24 - lifting hook. Specific embodiments

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] As Figure 1 、 Figure 2 、 Figure 3 shown in the pile foundation steel cage fixing device in the hole, including: air compressor 1, air delivery pipe 2, valve group 4, floating airbag 6, support balance airbag 5 and the cage guiding fixing system.

[0026] The air compressor 1 is connected to the floating airbag 6 and the support balance airbag 5 through the air delivery pipe 2; the valve group 4 is distributed on the air delivery pipe 2; there are three support balance airbags 5 in this embodiment, and the three support balance airbags 5 are evenly distributed on the periphery of the cage guiding fixing system and are between the cage guiding fixing system and the pile foundation hole. In this embodiment, there are at least four air delivery pipes 2, which are respectively connected to the floating airbag 6 and the three support balance airbags 5, and a valve is arranged on each air delivery pipe 2, and the four valves form the valve group 4. Among them, the air delivery pipe 2 is connected to the top center of the floating airbag 6, and the floating airbag 6 expands evenly when inflated. The valve is a ball valve. A pressure gauge 3 is also arranged on the air delivery pipe 2 for monitoring the pressure of the floating airbag 6 and the support balance airbag 5. The floating airbag 6 is a cylindrical flexible inflatable component. The support balance airbag 5 is an olive-shaped flexible inflatable component. The valve group 4 controls the inflation and deflation of the multiple support balance airbags 5 through the opening and closing of the valves to adjust the verticality of the traction steel cage combined structure in the pile foundation hole.

[0027] The cage guiding fixing system is of a cage structure; the steel cage of the pile foundation 12 is suspended and connected below the cage guiding fixing system to form a traction steel cage combined structure, and is hoisted as a whole into the pile foundation hole; the cage guiding fixing system is provided with a chamber, and the floating airbag 6 is arranged in the chamber; the buoyancy of the floating airbag 6 in the expanded state in the pile foundation hole is greater than the self-weight of the cage guiding fixing system and the steel cage of the pile foundation 12. During construction, there is mud in the pile foundation hole. Therefore, the floating airbag 6 is suspended or floating in the mud.

[0028] As Figure 3As shown in the figure, the cage fixing system includes the main cage bars 8, the restraint bars 9 and the cage stirrups 10; three groups of main cage bars 8 are arranged at intervals along the circumferential direction of the pile foundation steel cage 12, the lower ends of each group of main cage bars 8 are connected to the steel cage main bars of the pile foundation steel cage 12, and the upper ends of the three groups of main cage bars 8 are respectively connected to the restraint bars 9 to form an integral structure; three cage stirrups 10 are connected to the three groups of main cage bars 8 by hoop connections from top to bottom in sequence; the main cage bars 8, the restraint bars 9 and the cage stirrups 10 enclose to form a cage structure with a chamber inside.

[0029] The cage fixing system further includes a lifting point 7, and the lifting point 7 is arranged at the upper end of the main cage bar 8. Each group of main cage bars 8 is provided with an n-shaped round steel of specification HPB300 φ36 at the upper end, and its model can be adjusted according to the weight of the pile foundation steel cage 12 through calculation.

[0030] There are three restraint bars 9, and the three restraint bars 9 are arranged in a horizontal equilateral triangle at the top of the floating airbag 6; a group of main cage bars 8 is connected below the intersection point where every two restraint bars 9 are connected.

[0031] Each group of main cage bars 8 includes two vertical bars 11 arranged at intervals along the circumferential direction of the cage stirrup 10. The upper ends of the two vertical bars 11 of each group of main cage bars 8 are welded and fixed to the two legs of the n-shaped round steel, so as to realize the welding and fixing of each group of main cage bars 8 and the lifting point 7. The two ends of the restraint bar 9 are respectively welded and fixed to one of the vertical bars 11 of two groups of main cage bars 8. Each restraint bar 9 keeps horizontal. The levelness of the cage fixing system and the pile foundation steel cage 12 connected to the cage fixing system is controlled by the levelness of the three restraint bars 9.

[0032] As Figure 5 As shown in the figure, three buckles 16 are arranged on the back of the support balance airbag 5, and the three buckles 16 are distributed in a triangle. Each buckle 16 can rotate relative to the support balance airbag 5; a connecting grid 17 is arranged between the two vertical bars 11 of each group of main cage bars 8; the connecting grid 17 includes a plurality of transverse bars arranged at intervals along the height direction of the main cage bar 8; the back of the support balance airbag 5 abuts against the connecting grid 17, and the three buckles 16 are respectively buckled on the transverse bars, so as to realize the installation of the support balance airbag 5 on the main cage bar 8. The connecting grid 17 restricts the expansion direction of the support balance airbag 5, so that the back expansion direction is restricted by the connecting grid 17, avoiding the support balance airbag 5 squeezing the floating airbag 6 when expanding, and enabling the support balance airbag 5 to better squeeze between the main cage bar 8 and the pile foundation hole.

[0033] In some embodiments, at least two support balance airbags 5 can be arranged at intervals along the height direction of each group of main cage bars 8. By expanding the distribution height of the support balance airbags 5, the leveling accuracy of the traction steel cage combined structure is higher and the fixing effect is also better.

[0034] The cage fixing system further includes a positioning assembly; as Figure 4 shown, the positioning assembly includes a cage positioning ring 18, a diagonal brace 19, and a cage positioning disc 20. The horizontally arranged cage positioning ring 18 is fixedly inscribed inside the three restraint ribs 9. The cage positioning ring 18 is a circular ring. Above the cage positioning ring 18, a cage positioning disc 20 is concentrically arranged. The cage positioning disc 20 is a disc. The diagonal brace 19 is connected between the cage positioning disc 20 and the cage positioning ring 18. There are multiple diagonal braces 19, which are evenly distributed along the circumferential direction of the cage positioning ring 18. The diameter of the cage positioning ring 18 is larger than the diameter of the cage positioning disc 20. A cage positioning hole 21 is provided at the center of the cage positioning disc 20, and the center of the cage positioning hole 21 is located on the central axis of the pile foundation steel cage 12. The gas transmission pipe 2 can pass through the gap between any two diagonal braces 19.

[0035] The pile foundation steel cage 12 includes steel cage stirrups 13, and inside the steel cage stirrups 13, steel cage internal braces 14 arranged in an equilateral triangle are provided; the positioning assembly further includes a steel cage positioning ring 15, which is arranged inside the pile foundation steel cage 12 and is connected to the steel cage internal braces 14. The center of the steel cage positioning ring 15 is located on the central axis of the pile foundation steel cage 12.

[0036] The positioning assembly further includes a suspension line 22 and a plumb bob 23 suspended at the lower end of the suspension line 22; it should be emphasized that the suspension line 22 is supported and suspended at the center of the pile foundation hole through an existing cross-shaped positioning frame. The lower end of the suspension line 22 passes through the cage positioning hole 21; the plumb bob 23 is suspended below the cage positioning disc 20; both the upper end and the lower end of the plumb bob 23 are conical. As Figure 1 shown, when the plumb bob 23 is suspended inside the pile foundation steel cage 12, the conical tip at the lower end of the plumb bob 23 points to the steel cage positioning ring 15 and is on the target center line of the pile foundation steel cage 12. Taking this as a reference, the horizontal position of the pile foundation steel cage 12 is adjusted so that the center of the steel cage positioning ring 15 of the pile foundation steel cage 12 aligns with the conical tip at the lower end of the plumb bob 23, realizing the centering of the pile foundation steel cage 12.

[0037] Before the floating airbag 6 in the chamber of the cage fixing system expands, the suspension line 22 is lifted so that the plumb bob 23 is above the floating airbag 6. After the floating airbag 6 is fully inflated, the plumb bob 23 is between the floating airbag 6 and the cage positioning disc 20. By comparing whether the conical tip at the upper end of the plumb bob 23 is at the center of the cage positioning hole 21, it is judged whether the pile foundation steel cage 12 is centered. If the conical tip at the upper end of the plumb bob 23 does not point to the center of the cage positioning hole 21, the centering adjustment of the pile foundation steel cage 12 is realized by dynamically adjusting the air pressure of the three support balance airbags 5.

[0038] Based on the same inventive concept, the present invention also provides a construction method for the pile foundation steel reinforcement cage 12, which is constructed by using the above-mentioned fixing device for the pile foundation steel reinforcement cage in the hole. The method includes the following steps: Step 1: Install and lower the pile foundation steel reinforcement cage 12 in sections into the pile foundation hole.

[0039] Step 2: Assemble and weld the cage fixing system of the fixing device. At the construction site, assemble and weld the cage fixing system with the pile foundation steel reinforcement cage 12 to form a traction steel reinforcement cage combined structure. Connect the top three lifting points 7 of the traction steel reinforcement cage combined structure with the hook 24 of the crane, and lift and place the traction steel reinforcement cage combined structure into the pile foundation hole. Use the plumb line 22 and the plumb bob 23 suspended below the plumb line 22 to lower the plumb bob 23 to the center of the pile foundation steel reinforcement cage 12. The plumb line 22 is supported and suspended at the center of the pile foundation hole through an existing cross-shaped positioning frame. The plumb line dropping method is used to control the verticality of the traction steel reinforcement cage combined structure, and a level is used to measure the height and levelness of the three restraint bars 9 to control the elevation of the traction steel reinforcement cage combined structure, so that the traction steel reinforcement cage combined structure stands upright in the pile foundation hole.

[0040] Step 3: Place the uninflated floating airbag 6 in the cabin of the cage fixing system in advance. A gas charging and discharging interface for connecting with the air delivery pipe 2 is arranged at the center of the top of the floating airbag 6. The floating airbag 6 can be fixed in advance. The area around the gas charging and discharging interface at the top of the floating airbag 6 is fixed to the cage positioning ring 18 by means of tape bonding. After fixing, the gas charging and discharging interface is at the center of the cage positioning ring 18, and it is ensured that the top surface of the floating airbag 6 is smooth and free of wrinkles.

[0041] Step 4: Assemble the air compressor 1, the air delivery pipe 2 and the valve group 4, and connect the air delivery pipe 2 with the floating airbag 6 and the support balance airbag 5.

[0042] Step 5: Install a plurality of support balance airbags 5 between the cage fixing system and the pile foundation hole, and open the valve in the valve group 4 that is connected with the support balance airbag 5 to realize the fixation and preliminary positioning of the traction steel reinforcement cage combined structure in the pile foundation hole; specifically, lift the plumb line 22 so that the plumb bob 23 is suspended at the orifice of the pile foundation hole and above the traction steel reinforcement cage combined structure, as Figure 2 shown in the state; use the air compressor 1 to inflate a plurality of support balance airbags 5 simultaneously, so that the support balance airbags 5 expand and squeeze between the cage fixing system and the pile foundation hole; the plumb line 22 dropping method and the level are used to control the verticality and elevation of the traction steel reinforcement cage combined structure, and the method of using the plumb line 22 dropping method and the level to control the verticality and elevation of the traction steel reinforcement cage combined structure can adopt the existing technology.

[0043] Step Six: Open the valve in the valve group 4 that is connected to the floating airbag 6. Use the buoyancy of the floating airbag 6 to keep the pile foundation steel reinforcement cage 12 erected at its designed height, and remove the crane hook 24. At this time, the floating airbag 6 generates buoyancy under the action of the slurry within the virtual pile range of the pile foundation hole. Under the constraint of the cage fixing system, the buoyancy generated by the floating airbag 6 is transmitted to the pile foundation steel reinforcement cage 12, so that the pile foundation steel reinforcement cage 12 maintains a vertical state and the designed height.

[0044] Step Seven: Through controlling the opening and closing of the corresponding valves, conduct a linkage regulation on the air pressures of the multiple support and balance airbags 5, so that the inflation degrees of the three support and balance airbags 5 reach a proper state, and keep the distances between different positions on the side wall of the pile foundation steel reinforcement cage 12 and the side wall of the pile foundation hole within proper ranges. During this process, the suspension height of the pile foundation steel reinforcement cage 12 can also be regulated by inflating and deflating the floating airbag 6. Finally, under the combined action of the floating airbag 6 and the three support and balance airbags 5, the final calibration of the elevation and verticality of the pile foundation steel reinforcement cage 12 is achieved.

[0045] The above is only the preferred implementation mode of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A fixing device in a pile foundation reinforcement cage hole, characterized in that: include: Air compressor, air pipe, valve assembly, buoyancy airbag, support and balance airbag and cage fixing system; The air compressor is connected to the buoyancy airbag and the support balance airbag through an air pipe; the valve group is distributed on the air pipe; The cage fixing system is a cage structure, which is arranged in the pile foundation hole; the pile foundation steel cage is suspended and connected to the bottom of the cage fixing system to form a traction steel cage combined structure; the cage fixing system is equipped with a cabin, and the buoyancy airbag is arranged in the cabin; the buoyancy of the buoyancy airbag in the expanded state in the pile foundation hole is greater than the dead weight of the cage fixing system and the pile foundation steel cage; There are multiple supporting and balancing airbags distributed between the cage fixing system and the pile foundation hole; the valve group regulates the inflation and deflation of the multiple supporting and balancing airbags by opening and closing the valves, thereby adjusting the verticality of the traction steel cage combination structure in the pile foundation hole.

2. A pile foundation reinforcement cage hole fixing device according to claim 1, characterized in that: The cage fixing system includes cage main bars, restraining bars and cage stirrups; a plurality of the cage main bars are arranged at intervals along the circumference of the pile foundation steel cage, the lower ends of the cage main bars are connected to the pile foundation steel cage, and the upper ends of the plurality of cage main bars are connected to the restraining bars to form an integral structure; the cage stirrups are connected by hoops to connect a plurality of the cage main bars; the cage main bars, restraining bars and the cage stirrups together form the cabin.

3. A pile foundation reinforcement cage hole fixing device according to claim 2, characterized in that: There are three restraining ribs, which are arranged in a horizontal equilateral triangle on the top of the buoyancy airbag; the main reinforcement of the cage is connected below the intersection where every two of the restraining ribs are connected.

4. A pile foundation reinforcement cage hole fixing device according to claim 3, characterized in that: The cage fixing system also includes a positioning component; the positioning component includes a cage positioning ring, diagonal bracing bars and a cage positioning disk; the cage positioning ring is inscribed and fixed to the inner side of the three restraining bars, a cage positioning disk is concentrically arranged above the cage positioning ring, and the diagonal bracing bars are connected between the cage positioning disk and the cage positioning ring; a cage positioning hole is arranged at the center of the cage positioning disk, and the center of the cage positioning hole is located on the central axis of the pile foundation steel cage.

5. A pile foundation reinforcement cage hole fixing device according to claim 4, characterized in that: The positioning assembly also includes a suspension line and a plumb bob suspended from the lower end of the suspension line; the lower end of the suspension line passes through the cage positioning hole; the plumb bob is suspended below the cage positioning plate; the upper and lower ends of the plumb bob are both conical.

6. A pile foundation reinforcement cage hole fixing device according to claim 5, characterized in that: The pile foundation steel cage includes steel cage hoops, and the inner side of the steel cage hoops is provided with steel cage internal support bars arranged in an equilateral triangle; the positioning assembly also includes a steel cage positioning ring, which is arranged inside the pile foundation steel cage and connected to the steel cage internal support bars, and the center of the steel cage positioning ring is located on the central axis of the pile foundation steel cage.

7. A pile foundation reinforcement cage hole fixing device according to claim 2, characterized in that: There are three groups of main reinforcements for the cage, and each group of main reinforcements for the cage includes two vertical reinforcements that are spaced apart circumferentially along the stirrups for the cage.

8. A pile foundation reinforcement cage hole fixing device according to claim 7, characterized in that: A plurality of buckles are arranged on the back of the supporting and balancing airbag; a connecting grid is arranged between the two vertical steel bars of each group of the main reinforcement of the cage; the connecting grid includes transverse steel bars arranged at intervals along the height direction of the main reinforcement of the cage; the back of the supporting and balancing airbag abuts against the connecting grid, and the buckles are buckled on the transverse steel bars.

9. A pile foundation steel cage construction method, characterized in that: The method for constructing the pile foundation reinforcement cage hole fixing device according to claim 1 comprises the following steps: Step 1: Install the pile foundation reinforcement cage in sections and lower it into the pile foundation hole; Step 2: assemble and weld the cage fixing system of the fixing device, assemble and weld the cage fixing system and the pile foundation steel cage at the construction site to form a traction steel cage combined structure, and use a crane to place the traction steel cage combined structure in the pile foundation hole; Step 3: placing an uninflated buoyancy airbag in the cabin of the cage fixing system; Step 4: Assemble the air compressor, the air pipe and the valve group, and connect the air pipe with the buoyancy airbag and the support balance airbag; Step 5: Install a plurality of the supporting and balancing airbags between the cage fixing system and the pile foundation hole, open the valve in the valve group connected to the supporting and balancing airbags, and achieve the fixing and preliminary positioning of the traction steel cage combined structure in the pile foundation hole; Step 6: Open the valve in the valve group connected to the buoyancy airbag, use the buoyancy of the buoyancy airbag to keep the pile foundation steel cage upright at its designed height, and remove the crane hook; Step seven: Linking and regulating the air pressure of the plurality of supporting balance airbags to achieve final calibration of the elevation and verticality of the pile foundation reinforcement cage.

10. A pile foundation reinforcement cage construction method according to claim 9, characterized in that: In the second step, the step of using a crane to pull the steel cage assembly structure into the pile foundation hole includes: Use a crane hook to connect the top of the cage fixing system to hoist the traction steel cage assembly structure into the pile foundation hole; use a hanging line and a plumb bob suspended below the hanging line to lower the plumb bob to the center of the pile foundation steel cage, use a hanging line and plumb method to control the verticality of the traction steel cage assembly structure, use a level to control the elevation of the traction steel cage assembly structure, and make the traction steel cage assembly structure stand upright in the pile foundation hole; In step 5, the steps of fixing and preliminarily positioning the traction steel cage assembly structure in the pile foundation hole include: The hanging line is pulled up to make the plumb bob suspended at the opening of the pile foundation hole and located above the traction steel cage composite structure; the multiple supporting balancing airbags are inflated simultaneously by an air compressor to make the supporting balancing airbags expand and squeeze between the cage fixing system and the pile foundation hole; the hanging line method and level are used to control the verticality and elevation of the traction steel cage composite structure.

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