A kind of pile foundation reinforcement cage hole fixing device and construction method

Abstract

The present application relates to the technical field of pile foundation construction, and provides a device and construction method for fixing the inner hole of a pile foundation reinforcement cage, including an air compressor, an air pipe, a valve group, a buoyancy airbag, a supporting and balancing airbag, and a cage fixing system. The buoyancy generated by the buoyancy airbag in the mud, combined with the rigid constraints of the cage fixing system, solves the problem of the inability to fix the reinforcement cage under special working conditions such as complex geology, limited space, and full casing follow-up. The cage fixing system is composed of a welding of a hanging point, main reinforcement of the cage, restraining reinforcement, and hoop reinforcement of the cage. The restraining reinforcement is arranged in an equilateral triangle to limit the movement of the buoyancy airbag, ensuring that the reinforcement cage is upright and accurately positioned at the center.

Description

Technical Field

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

[0002] Currently, securing the rebar cage is a critical step in ensuring project quality during pile foundation construction. Traditional methods typically use hanger welding or steel sections to secure the top of the rebar cage to the steel casing to ensure verticality, prevent the bottom end from contacting the hole bottom, and ensure that the protective layer thickness meets design requirements. However, in special circumstances such as complex geological conditions (such as caves, faults, and quicksand), limited construction site space, or the use of a full casing follow-up process, traditional fixing methods are difficult to implement. This can lead to the rebar cage contacting the hole bottom, distortion, or misalignment. This in turn results in uneven thickness of the pile foundation rebar cage protective layer, insufficient localized protective layer thickness, and cage misalignment, impacting the durability and safety of the pile foundation.

[0003] Therefore, there is an urgent need for a device that can stably fix the steel cage under special working conditions to solve the shortcomings of the existing technology. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a pile foundation steel cage hole fixing device and construction method. Through the cooperation of the buoyancy of the buoyancy airbag and the cage fixing system, the problem that the steel cage cannot be fixed under special working conditions is solved, ensuring that the verticality, protective layer thickness and center position of the steel cage meet the design requirements.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In the first aspect, the present invention proposes a device for fixing a pile foundation steel cage hole, comprising: an air compressor, an air supply pipe, a valve group, a buoyancy airbag, a support and balance airbag and a cage fixing system; the air compressor connects the buoyancy airbag and the support and balance airbag through the air supply pipe; the valve group is distributed on the air supply 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 combination 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 support and balance airbags, which are distributed between the cage fixing system and the pile foundation hole; the valve group regulates the inflation and deflation of multiple support and balance airbags by opening and closing valves to adjust the verticality of the traction steel cage combination structure in the pile foundation hole.

[0007] Furthermore, 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 to a plurality of the cage main bars; the cage main bars, restraining bars and cage stirrups together form the cabin.

[0008] Furthermore, the cage fixing system further includes a hanging point, which is arranged at the upper end of the cage main reinforcement.

[0009] Furthermore, there are a plurality of cage stirrups, and the plurality of cage stirrups are arranged at intervals along the height direction of the cage main reinforcement.

[0010] Furthermore, 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 restraining ribs are connected.

[0011] Furthermore, the cage fixing system also includes a positioning component; the positioning component includes a cage positioning ring, diagonal bracing bars and a cage positioning plate; the cage positioning ring is inscribed and fixed on the inner side of the three restraining bars, and a cage positioning plate is concentrically arranged above the cage positioning ring, and the diagonal bracing bars are connected between the cage positioning plate and the cage positioning ring; a cage positioning hole is provided in the center of the cage positioning plate, and the center of the cage positioning hole is located on the central axis of the pile foundation steel cage.

[0012] Furthermore, 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.

[0013] Furthermore, the pile foundation steel cage includes steel cage stirrups, and the inner side of the steel cage stirrups 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.

[0014] Furthermore, there are three groups of the cage main reinforcement, and each group of the cage main reinforcement includes two vertical steel bars arranged at intervals along the circumference of the cage stirrups.

[0015] Furthermore, a plurality of clips are provided on the back of the supporting and balancing airbag; a connecting grid is provided 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 clips are buckled on the transverse steel bars.

[0016] Furthermore, the air supply pipe is connected to the top center of the buoyancy airbag.

[0017] Furthermore, the valve is a ball valve.

[0018] Furthermore, a pressure gauge is provided on the gas pipeline.

[0019] Furthermore, the buoyancy airbag is a cylindrical flexible inflatable component.

[0020] In a second aspect, the present invention further provides a method for constructing a pile foundation reinforcement cage, using the above-mentioned pile foundation reinforcement cage hole fixing device for construction, the method comprising the following steps:

[0021] Step 1: Install the pile foundation reinforcement cage in sections and lower it into the pile foundation hole;

[0022] Step 2: Assemble and weld the cage fixing system of the fixing device, assemble and weld the cage fixing system and the pile foundation reinforcement cage at the construction site to form a traction reinforcement cage combined structure, and use a crane to place the traction reinforcement cage combined structure in the pile foundation hole;

[0023] Step 3: placing the uninflated buoyancy airbag in the cabin of the cage fixing system;

[0024] Step 4: Assemble the air compressor, air pipe and valve assembly, and connect the air pipe to the buoyancy airbag and the support balance airbag;

[0025] 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 fixation and preliminary positioning of the traction steel cage assembly structure in the pile foundation hole;

[0026] 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;

[0027] Step 7: Jointly regulate the air pressure of the plurality of support balancing airbags to achieve final calibration of the elevation and verticality of the pile foundation reinforcement cage.

[0028] Furthermore, in step 2, the step of using a crane to pull the steel cage assembly structure into the pile foundation hole includes:

[0029] Using a crane hook to connect to the top of the cage fixing system, hoist the traction steel cage assembly structure into the pile foundation hole; using a hanging line and a plumb bob suspended below the hanging line, lower the plumb bob to the center of the pile foundation steel cage, use the hanging line and plumb bob method to control the verticality of the traction steel cage assembly structure, and use a level to control the elevation of the traction steel cage assembly structure, so that the traction steel cage assembly structure is erected in the pile foundation hole;

[0030] In step five, the steps of fixing and preliminarily positioning the traction steel cage assembly structure in the pile foundation hole include:

[0031] Pull the hanging line so that the plumb bob is suspended at the opening of the pile foundation hole and is located above the traction steel cage assembly structure; use an air compressor to simultaneously inflate multiple supporting and balancing airbags so that the supporting and balancing airbags expand and squeeze between the cage fixing system and the pile foundation hole; use the hanging line method and level to control the verticality and elevation of the traction steel cage assembly structure.

[0032] The beneficial effects of the present invention are as follows: by supporting the balancing airbag between the cage fixing system and the pile foundation hole, the temporary support, fixation and positioning of the traction steel cage assembly structure in the pile foundation hole are facilitated; it is also convenient to adjust the verticality of the traction steel cage assembly structure, and in combination with the buoyancy airbag, the elevation control of the traction steel cage assembly structure is achieved. The buoyancy of the buoyancy airbag supports the pile foundation steel cage, avoiding the reliance on steel casing in traditional fixing methods, and is suitable for special working conditions such as complex geology, limited space and full casing follow-up. The cage fixing system forms a rigid cage structure with a compartment through the restraining bars, cage main bars and cage hoop bars, effectively limiting the movement of the buoyancy airbag and evenly transmitting the buoyancy, ensuring the upright and accurate center position of the pile foundation steel cage, and solving the problems of twisting and misalignment. The valve group realizes precise control of the air pressure of the buoyancy airbag and the supporting balancing airbag, and the configuration of the pressure gauge can monitor the air leakage in real time to ensure the reliability of the fixing device. The connection method of the various components of the fixing device is simple, the structure is strong, and it can be reused, reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural schematic diagram of the traction steel cage assembly structure of the pile foundation steel cage hole fixing device of the present invention being hoisted into the pile foundation hole;

[0034] Figure 2 for Figure 1 A schematic diagram of the structure in which the buoyancy air bag in the cage fixing system is expanded;

[0035] Figure 3 Schematic diagram of the structure of the cage fixing system of the present invention;

[0036] Figure 4Schematic diagram of the top view of the cage fixing system of the present invention;

[0037] Figure 5 This is a structural diagram of the connection between the back buckle and the connecting grille of the supporting balancing airbag of the present invention.

[0038] In the figure: 1-air compressor; 2-air transmission pipe; 3-pressure gauge; 4-valve group; 5-support balance airbag; 6-buoyancy airbag; 7-hanging point; 8-main reinforcement of the cage; 9-restraint reinforcement; 10-hoops of the cage; 11-vertical reinforcement; 12-pile foundation steel cage; 13-hoops of the cage; 14-support reinforcement in the cage; 15-positioning ring of the cage; 16-clip; 17-connecting grid; 18-positioning ring of the cage; 19-diagonal support reinforcement; 20-positioning plate of the cage; 21-positioning hole of the cage; 22-hanging line; 23-plumb bob; 24-hook. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1 、 Figure 2 、 Figure 3 The pile foundation reinforcement cage hole fixing device shown includes: an air compressor 1, an air pipe 2, a valve group 4, a buoyancy air bag 6, a supporting and balancing air bag 5 and a cage fixing system.

[0041] The air compressor 1 connects the buoyancy bag 6 and the supporting and balancing bag 5 via an air supply pipe 2. A valve group 4 is located on the air supply pipe 2. In this embodiment, there are three supporting and balancing bags 5, evenly distributed around the cage fixing system and between the cage fixing system and the pile foundation hole. In this embodiment, there are at least four air supply pipes 2, each connected to the buoyancy bag 6 and the three supporting and balancing bags 5. Each air supply pipe 2 is equipped with a valve, and the four valves constitute the valve group 4. The air supply pipe 2 connects to the top center of the buoyancy bag 6, ensuring uniform expansion of the buoyancy bag 6 during inflation. The valve is a ball valve. A pressure gauge 3 is also located on the air supply pipe 2 to monitor the pressure in the buoyancy bag 6 and the supporting and balancing bag 5. The buoyancy bag 6 is a cylindrical, flexible, inflatable component. The supporting and balancing bag 5 is a rugby-shaped, flexible, inflatable component. The valve group 4 controls the inflation and deflation of the multiple supporting and balancing bags 5 by opening and closing the valves, thereby adjusting the verticality of the traction steel cage assembly within the pile foundation hole.

[0042] The cage fixing system is a cage structure; the pile foundation steel cage 12 is suspended and connected to the bottom of the cage fixing system to form a traction steel cage combined structure, which is hoisted as a whole into the pile foundation hole; the cage fixing system is equipped with a cabin, and the buoyancy airbag 6 is arranged in the cabin; the buoyancy airbag 6 in the expanded state in the pile foundation hole has a buoyancy greater than the dead weight of the cage fixing system and the pile foundation steel cage 12. During construction, there is mud in the pile foundation hole, so the buoyancy airbag 6 is suspended or floating in the mud.

[0043] like Figure 3 As shown, the cage fixing system includes cage main bars 8, restraining bars 9 and cage stirrups 10; three groups of cage main bars 8 are arranged at intervals along the circumference of the pile foundation reinforcement cage 12, the lower end of each group of cage main bars 8 is connected to the reinforcement cage main bars of the pile foundation reinforcement cage 12, and the upper ends of the three groups of cage main bars 8 are respectively connected to the restraining bars 9 to form an integral structure; three cage stirrups 10 are sequentially connected by hooping the three groups of cage main bars 8 from top to bottom; the cage main bars 8, restraining bars 9 and cage stirrups 10 together form a cage structure with a cabin inside.

[0044] The cage fixing system also includes a hanging point 7, which is set at the upper end of the cage main reinforcement 8. The upper end of each set of cage main reinforcement 8 is provided with an n-shaped round steel of specification model HPB300 φ36, whose model can be adjusted by calculation according to the weight of the pile foundation reinforcement cage 12.

[0045] There are three restraining ribs 9, which are arranged in a horizontal equilateral triangle on the top of the buoyancy airbag 6; a group of cage main ribs 8 are connected below the intersection where every two restraining ribs 9 are connected.

[0046] Each set of cage main reinforcement 8 includes two vertical bars 11 spaced circumferentially along the cage stirrups 10. The upper ends of the two vertical bars 11 in each set of cage main reinforcement 8 are welded to the two legs of the N-shaped round steel bar, securing each set of cage main reinforcement 8 to the hanging point 7. The ends of the restraining bars 9 are welded to one of the vertical bars 11 in each set of cage main reinforcement 8. Each restraining bar 9 maintains a horizontal position. The horizontality of the three restraining bars 9 controls the horizontality of the cage fixing system and the pile foundation reinforcement cage 12 connected to it.

[0047] like Figure 5As shown, the back of the supporting and balancing airbag 5 is provided with three clips 16, which are arranged in a triangular shape. Each clip 16 and the supporting and balancing airbag 5 can rotate relative to each other. A connecting grid 17 is provided between the two vertical steel bars 11 of each group of cage main bars 8. The connecting grid 17 includes a plurality of transverse steel bars spaced apart along the height direction of the cage main bars 8. The back of the supporting and balancing airbag 5 abuts the connecting grid 17, and the three clips 16 are respectively engaged with the transverse steel bars, thereby achieving the installation of the supporting and balancing airbag 5 on the cage main bars 8. The connecting grid 17 limits the expansion direction of the supporting and balancing airbag 5, so that the expansion direction of the back of the supporting and balancing airbag is limited by the connecting grid 17, preventing the supporting and balancing airbag 5 from squeezing the buoyancy airbag 6 when it expands, and allowing the supporting and balancing airbag 5 to be better squeezed between the cage main bars 8 and the pile foundation hole.

[0048] In some embodiments, at least two supporting and balancing airbags 5 can be arranged at intervals along the height direction of each group of main reinforcements 8 of the traction cage. By expanding the distribution height of the supporting and balancing airbags 5, the leveling accuracy of the traction steel cage combination structure is higher and the fixing effect is better.

[0049] The cage fixing system also includes a positioning component; Figure 4 As shown, the positioning assembly includes a cage positioning ring 18, diagonal bracing bars 19, and a cage positioning disc 20. The horizontal cage positioning ring 18 is inscribed and fixed to the inner side of the three restraining bars 9. The cage positioning ring 18 is a circular ring, and the cage positioning disc 20 is concentrically located above the ring 18. The diagonal bracing bars 19 connect the cage positioning disc 20 and the cage positioning ring 18. There are multiple diagonal bracing bars 19, evenly distributed along the circumference of the cage positioning ring 18. The diameter of the cage positioning ring 18 is larger than that of the cage positioning disc 20. A cage positioning hole 21 is provided in 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 reinforcement cage 12. The gas pipe 2 can pass through the gap between any two diagonal bracing bars 19.

[0050] The pile foundation steel cage 12 includes steel cage stirrups 13, and the inner side of the steel cage stirrups 13 is provided with steel cage internal support bars 14 arranged in an equilateral triangle; the positioning component also includes a steel cage positioning ring 15, which is arranged inside the pile foundation steel cage 12 and connected to the steel cage internal support bars 14. The center of the steel cage positioning ring 15 is located on the central axis of the pile foundation steel cage 12.

[0051] The positioning assembly also includes a suspension line 22 and a plumb bob 23 suspended from the lower end of the suspension line 22. It should be emphasized that the suspension line 22 is suspended in the center of the pile foundation hole via 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 plate 20; the upper and lower ends of the plumb bob 23 are both conical. Figure 1As shown, when the plumb bob 23 is suspended in the pile foundation reinforcement cage 12, the conical tip at the lower end of the plumb bob 23 points to the reinforcement cage positioning ring 15 and is located on the target center line of the pile foundation reinforcement cage 12. Using this as a reference, the horizontal position of the pile foundation reinforcement cage 12 is adjusted so that the center of the reinforcement cage positioning ring 15 of the pile foundation reinforcement cage 12 is aligned with the conical tip at the lower end of the plumb bob 23, thereby achieving the centering of the pile foundation reinforcement cage 12.

[0052] Before the buoyancy airbag 6 of the cabin of the cage fixing system is inflated, the hanging line 22 is pulled to place the plumb bob 23 above the buoyancy airbag 6. After the buoyancy airbag 6 is fully inflated, the plumb bob 23 is between the buoyancy airbag 6 and the cage positioning plate 20. By comparing whether the conical tip of the upper end of the plumb bob 23 is in the center of the cage positioning hole 21, it is determined whether the pile foundation steel cage 12 is centered. If the conical tip of 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 achieved by dynamically adjusting the air pressure of the three supporting balance airbags 5.

[0053] Based on the same inventive concept, the present invention also proposes a method for constructing a pile foundation reinforcement cage 12, which utilizes the above-mentioned in-hole fixing device for the pile foundation reinforcement cage 12. The method comprises the following steps:

[0054] Step 1: Install and lower the pile foundation reinforcement cage into the pile foundation hole in 12 sections.

[0055] Step 2: Assemble the cage fixing system of the welding fixture. At the construction site, assemble and weld the cage fixing system to the pile foundation steel cage 12 to form a traction steel cage composite structure. Use the crane hook 24 to connect the three hanging points 7 on the top of the traction steel cage composite structure, and hang the traction steel cage composite structure in the pile foundation hole. Use the hanging line 22 and the plumb bob 23 suspended below the hanging line 22 to lower the plumb bob 23 to the center of the pile foundation steel cage 12. The hanging line 22 is supported and suspended in the center of the pile foundation hole by the existing cross-shaped positioning frame. Use the hanging line plumb method to control the verticality of the traction steel cage composite structure, use a level to measure the height and horizontality of the three restraining bars 9, control the elevation of the traction steel cage composite structure, and make the traction steel cage composite structure stand upright in the pile foundation hole.

[0056] Step 3: Place the uninflated buoyancy bag 6 in the chamber of the cage fixing system. A gas charging and discharging port for connecting to the air pipe 2 is located at the center of the top of the buoyancy bag 6. The buoyancy bag 6 can be secured in advance by taping the area around the gas charging and discharging port to the cage positioning ring 18. Once secured, the gas charging and discharging port is centered on the cage positioning ring 18, ensuring that the top surface of the buoyancy bag 6 is smooth and wrinkle-free.

[0057] Step 4: Assemble the air compressor 1, the air pipe 2 and the valve group 4, and connect the air pipe 2 with the buoyancy airbag 6 and the supporting balance airbag 5.

[0058] Step 5: Install multiple supporting and balancing air bags 5 between the cage fixing system and the pile foundation hole, open the valve in the valve group 4 that is connected to the supporting and balancing air bags 5, and realize the fixation and preliminary positioning of the traction steel cage combination structure in the pile foundation hole; specifically, pull the hanging line 22 to suspend the plumb bob 23 at the hole opening of the pile foundation hole and above the traction steel cage combination structure, as shown in FIG. Figure 2 The state shown; use the air compressor 1 to inflate multiple supporting and balancing air bags 5 at the same time, so that the supporting and balancing air bags 5 expand and squeeze between the cage fixing system and the pile foundation hole; use the hanging line 22 drop method and the level to control the verticality and elevation of the traction steel cage combination structure, and use the hanging line 22 drop method and the level to control the verticality and elevation of the traction steel cage combination structure. The method of using the existing technology can be used.

[0059] Step 6: Open the valve in valve assembly 4 connected to buoyancy bag 6, using the buoyancy of buoyancy bag 6 to maintain the pile foundation reinforcement cage 12 upright at its designed height, and remove the crane hook 24. At this time, the buoyancy bag 6 generates buoyancy under the action of the mud within the virtual pile range of the pile foundation hole. The buoyancy generated by the buoyancy bag 6 is transmitted to the pile foundation reinforcement cage 12 under the restraint of the cage fixing system, so that the pile foundation reinforcement cage 12 remains in a vertical state and maintains the designed height.

[0060] Step seven: by controlling the opening and closing of the corresponding valves, the air pressure of the multiple supporting and balancing airbags 5 is linked and regulated, so that the expansion degree of the three supporting and balancing airbags 5 reaches an appropriate state, and the distance between the different positions of the side wall of the pile foundation steel cage 12 and the side wall of the pile foundation hole is maintained within an appropriate range. In this process, the suspension height of the pile foundation steel cage 12 can also be regulated by the inflation and deflation of the buoyancy airbag 6. Finally, under the joint action of the buoyancy airbag 6 and the three supporting and balancing airbags 5, the final calibration of the elevation and verticality of the pile foundation steel cage 12 is achieved.

[0061] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A fixing device for 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-type structure, which is arranged in the pile foundation hole; the pile foundation reinforcement cage is suspended and connected to the bottom of the cage fixing system to form a traction reinforcement cage combined structure; the cage fixing system is equipped with a cabin, and the buoyancy airbag is arranged in the cabin; the buoyancy airbag in the expanded state in the pile foundation hole has a buoyancy greater than the deadweight of the cage fixing system and the pile foundation reinforcement cage; the buoyancy airbag is a cylindrical flexible inflatable component; the buoyancy airbag is suspended or floats in the mud; 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 combined structure in the pile foundation hole; The cage fixing system includes cage main bars, restraining bars, and cage stirrups; a plurality of cage main bars are arranged at intervals along the circumference of the pile foundation reinforcement cage, the lower ends of the cage main bars are connected to the pile foundation reinforcement 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 a clamp to the plurality of cage main bars; the cage main bars, restraining bars, and cage stirrups together form the cabin; There are three restraining ribs, which are arranged in a horizontal equilateral triangle on top of the buoyancy airbag; the main reinforcement of the cage is connected below the intersection of every two restraining ribs; 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 plate; the cage positioning ring is inscribed and fixed to the inner side of the three restraining bars, a cage positioning plate is concentrically arranged above the cage positioning ring, and the diagonal bracing bar is connected between the cage positioning plate and the cage positioning ring; a cage positioning hole is provided at the center of the cage positioning plate, and the center of the cage positioning hole is located on the central axis of the pile foundation reinforcement cage; The center of the top of the buoyancy airbag is provided with a gas charging and discharging interface for connecting with the gas pipe; the gas charging and discharging interface is located in the center of the cage positioning ring.

2. A pile foundation reinforcement cage hole fixing device according to claim 1, 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.

3. A pile foundation reinforcement cage hole fixing device according to claim 2, characterized in that: The pile foundation steel cage includes steel cage stirrups, and the inner side of the steel cage stirrups 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.

4. A pile foundation reinforcement cage hole fixing device according to claim 1, 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 along the circumference of the cage stirrups.

5. A pile foundation reinforcement cage hole fixing device according to claim 4, characterized in that: A plurality of clips are provided on the back of the supporting and balancing airbag; a connecting grid is provided 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 clips are buckled on the transverse steel bars.

6. A pile foundation reinforcement 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 reinforcement cage at the construction site to form a traction reinforcement cage combined structure, and use a crane to place the traction reinforcement cage combined structure in the pile foundation hole; Step 3: placing the uninflated buoyancy airbag in the cabin of the cage fixing system; Step 4: Assemble the air compressor, air pipe and valve assembly, and connect the air pipe to 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 fixation and preliminary positioning of the traction steel cage assembly 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 7: Jointly regulate the air pressure of the plurality of support balancing airbags to achieve final calibration of the elevation and verticality of the pile foundation reinforcement cage.

7. A pile foundation reinforcement cage construction method according to claim 6, 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: Using a crane hook to connect to the top of the cage fixing system, hoist the traction steel cage assembly structure into the pile foundation hole; using a hanging line and a plumb bob suspended below the hanging line, lower the plumb bob to the center of the pile foundation steel cage, use the hanging line and plumb bob method to control the verticality of the traction steel cage assembly structure, and use a level to control the elevation of the traction steel cage assembly structure, so that the traction steel cage assembly structure is erected in the pile foundation hole; In step five, the steps of fixing and preliminarily positioning the traction steel cage assembly structure in the pile foundation hole include: Pull the hanging line so that the plumb bob is suspended at the opening of the pile foundation hole and is located above the traction steel cage assembly structure; use an air compressor to simultaneously inflate multiple supporting and balancing airbags so that the supporting and balancing airbags expand and squeeze between the cage fixing system and the pile foundation hole; use the hanging line method and level to control the verticality and elevation of the traction steel cage assembly structure.

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