Method for on-site preparation of flexible reinforcement cages

Abstract

The application discloses a flexible steel reinforcement cage field preparation method, which comprises the following steps: winding and coiling flexible steel reinforcement cage meshes along longitudinal reinforcement on a winding drum to form a winding drum type flexible steel reinforcement cage assembly; symmetrically installing two winding drum type flexible steel reinforcement cage assemblies above a pile hole; synchronously unfolding the flexible steel reinforcement cage meshes on the two winding drum type flexible steel reinforcement cage assemblies along the longitudinal reinforcement to match the stirrup height of the two flexible steel reinforcement cage meshes; bending the stirrups of the two unfolded flexible steel reinforcement cage meshes into semicircles, overlapping the two ends of the two semicircular stirrups, and fixing the overlapping part to form the flexible steel reinforcement cage. The method has the advantages that the longitudinal reinforcement of the flexible steel reinforcement cage meshes is wound by steel strands, the space occupation is small, storage and transportation are facilitated, the two wound flexible steel reinforcement cage meshes can be unfolded, adjusted, spliced and lowered in a low clearance environment, and the integral longitudinal reinforcement can guarantee the overall quality of the pile body.

Description

Technical Field

[0001] This invention relates to the field of underground pile foundation reinforcement cage technology, and in particular to a method for on-site preparation of flexible reinforcement cages adapted to low-headroom construction environments. Background Technology

[0002] Currently, urban renewal is an important means of promoting urban development. It involves the restoration, renovation, and redevelopment of existing old and historical buildings to revitalize the city, thereby improving the quality of life and the environment, and boosting urban development. However, the renovation of existing buildings often requires indoor pile foundation construction while preserving the original structure. This presents challenges such as limited construction height and confined space, hindering the access of large machinery. When steel cage construction is involved, methods such as segmented binding, segmented hoisting, and segmented welding are frequently used, resulting in low efficiency, long construction times, and high labor and material costs. Summary of the Invention

[0003] To address the aforementioned problems in steel cage construction in low-headroom environments, this invention proposes a method for on-site preparation of flexible steel cages, which can avoid segmented construction of steel cages, effectively improve construction efficiency, and ensure the quality of steel cage construction.

[0004] To solve the above technical problems, the present invention includes the following technical solutions: A method for on-site fabrication of a flexible reinforcing cage, the method comprising the following steps: Step 1: Roll up the flexible steel cage mesh along the longitudinal bars and coil it onto a drum to form a drum-type flexible steel cage assembly; the flexible steel cage mesh includes several longitudinal bars and several stirrups, the longitudinal bars are steel strands, and the stirrups are arranged parallel and spaced apart and perpendicular to the longitudinal bars, the number of longitudinal bars is [number missing]. x / 2, where x This refers to the design value for the number of longitudinal reinforcement bars in the flexible steel cage; Step 2: Transport the roll-type flexible rebar cage assembly to the construction site, and symmetrically install two roll-type flexible rebar cage assemblies above the pile hole using a bracket. The roll and the bracket are rotatably connected, and a drive mechanism for controlling the rotation of the roll is installed. Step 3: The drum is rotated by the drive mechanism, and the flexible steel cage mesh on the two drum-type flexible steel cage assemblies is simultaneously unfolded along the longitudinal bars, so that the stirrup heights of the two flexible steel cage meshes match. Step 4: Bend the stirrups of the two unfolded flexible steel cage meshes into semicircles, and lap the ends of the two semicircular stirrups together. After splicing and fixing the lap joints, a flexible steel cage is formed.

[0005] Furthermore, the first end of the stirrup of the flexible steel cage mesh is provided with a stirrup connecting sleeve; the first end of the stirrup connecting sleeve is provided with an internal thread, the second end is provided with a cavity, the cavity is provided with colloid, and is sealed by a sealing structure; the first end of the stirrup connecting sleeve is threadedly connected to one end of the stirrup. In step two, when the two roll-type flexible steel cage assemblies are symmetrically installed above the pile hole using the bracket, the connecting sleeves of the two steel cage meshes are set in opposite directions. In step four, the two semi-circular stirrups are lapped at both ends and the lapped joints are spliced ​​and fixed. Instead, the second end of each stirrup pierces the end cap structure of the stirrup connecting sleeve of the other stirrup and is inserted into the adhesive, and then fixed by adhesive bonding.

[0006] Furthermore, in step four, the stirrups of the two unfolded flexible steel cage meshes are bent into semicircles, and this is done using a flexible steel cage on-site fabrication equipment. The flexible steel cage on-site fabrication equipment includes a support frame and a bending adjustment assembly. The support frame includes several support columns and a horizontal frame, with the horizontal frame set on the support columns. The bending adjustment assembly includes a first bending adjustment mechanism and two second bending adjustment mechanisms. The first adjustment mechanism includes a central column, two first telescopic hydraulic cylinders, two second telescopic hydraulic cylinders, two first jacking panels, and two second jacking panels. The top of the central column is fixedly connected to the horizontal frame and located directly above the pile hole. The two first telescopic hydraulic cylinders and the two second telescopic hydraulic cylinders are arranged around the central column and radially along the central column. The two first telescopic hydraulic cylinders and the two second telescopic hydraulic cylinders are symmetrically arranged along the central column. One end of the first telescopic hydraulic cylinder is fixedly connected to the central column, and the other end is fixedly connected to the first jacking panel. One end of the second telescopic hydraulic cylinder is fixedly connected to the central column, and the other end is fixedly connected to the second jacking panel. The ends of the first and second jacking panels away from the central column are both arc segments with a radius of R, where R is the radius of the flexible steel cage. Under the coordinated action of the first and second telescopic hydraulic cylinders, the arc surfaces of the two first jacking panels and the two second jacking panels can form a circle with a radius of R. The second bending mechanism includes a reaction backrest, a third telescopic cylinder, and a push back plate. The reaction backrest is mounted on the support frame. One end of the third telescopic cylinder is fixedly connected to the reaction backrest, and the other end is fixedly connected to the push back plate. The push back plate has an arc-shaped groove on the side away from the third telescopic cylinder. The two second bending mechanisms are symmetrically arranged along the central column. Under the action of the third telescopic cylinder, the two push back plates can encircle the first bending mechanism. In step four, the stirrups of the two unfolded flexible steel mesh cages are bent into semicircles, specifically including the following steps: A1. Under the coordinated action of the first telescopic cylinder and the second telescopic cylinder, the arc segments of the two first push panels and the arc segments of the two second push panels form a circle with a radius of R. The third telescopic cylinder is in the retracted state. The unfolded flexible steel cage mesh is lowered between the first push panel and the push back plate. The height of the stirrups of the two flexible steel cage meshes are matched. A2. The third telescopic cylinder extends, causing the push back plate to push the stirrups to move, so that the stirrups abut against the second push panel and bend into a semicircle. The ends of the two semicircular stirrups overlap, and the overlap part corresponds to the second push panel. A3. The second telescopic cylinder retracts to retract the second jacking panel, and the third jacking cylinder retracts to retract the jacking back plate, freeing up operating space to fix the lap joint of the stirrups. This can be done by welding or binding with wire to form a flexible steel cage. Then, the first telescopic cylinder retracts to retract the first jacking panel, preparing for the lowering of the flexible steel cage.

[0007] Furthermore, rollers are installed at both ends of the push-back plate. When the third telescopic cylinder extends, the rollers push the stirrups to move.

[0008] The present invention, by adopting the above technical solution, has the following advantages and positive effects compared with the prior art: The flexible rebar cage on-site preparation method provided by the present invention uses steel strands for the longitudinal reinforcement of the flexible rebar cage mesh, allowing the flexible rebar cage mesh to be rolled up along the longitudinal reinforcement, occupying little space and facilitating storage and transportation. Moreover, it can gradually unfold two parallel flexible rebar cage meshes along the longitudinal reinforcement in indoor low-clearance environments, and the stirrups are bent into semicircles and the ends of the two semicircles are fixed to form a flexible rebar cage. The flexible rebar cage is lowered simultaneously during the unfolding of the flexible rebar cage mesh. This construction method can prepare flexible rebar cages on-site under low-clearance conditions, avoiding the problem of numerous welding points in the segmented hoisting and segmented welding of longitudinal reinforcement in conventional construction. The integrated longitudinal reinforcement can ensure the overall quality of the pile body. This method also has the advantages of high construction efficiency, low material consumption, and low cost. By using flexible rebar cage manufacturing equipment to bend the stirrups of the unfolded flexible rebar cage mesh into semicircles, the efficiency and quality of stirrup bending and forming are improved. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view of a roll-type flexible steel cage assembly according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the winding of a flexible steel cage mesh in one embodiment of the present invention; Figure 3 This is a schematic diagram of two flexible steel cage mesh panels being unfolded, bent, and spliced ​​to form a flexible steel cage in one embodiment of the present invention; Figure 4This is a schematic diagram of the longitudinal bar spacing and stirrup end extension length of two flexible steel cage meshes in one embodiment of the present invention; Figure 5 A schematic diagram showing sleeves installed at the ends of the stirrups in a roll-type flexible steel cage assembly. Figure 6 This is a schematic diagram of the sleeve structure; Figure 7 This is a schematic diagram illustrating the fabrication of a flexible steel cage using a flexible steel cage fabrication device, according to an embodiment of the present invention. Figure 8 This diagram shows the positional relationship between the flexible steel mesh cage and the adjustment device after it has been unfolded. Figure 9 A schematic diagram illustrating how the middle part of the stirrup is adjusted into an arc segment using a multi-telescopic end bending device and a first telescopic bending mechanism; Figure 10 A schematic diagram illustrating how to adjust the two ends of a stirrup into an arc segment using a multi-telescopic end bending device, a second telescopic bending mechanism, and a third telescopic bending mechanism. Figure 11 This is a schematic diagram showing the reset of the multi-telescopic end bending device, the first telescopic bending mechanism, the second telescopic bending mechanism, and the third telescopic bending mechanism.

[0010] The numbers in the diagram are as follows: 1- Flexible steel cage; 10-Roll-type flexible rebar cage assembly; 11-Roll; 12-Flexible rebar cage mesh; 13-Longitudinal reinforcement; 14-Stirrup; 15-Snap-on connector; 16-Steel strand connecting sleeve; 17-Stirrup connecting sleeve; 171-Internal thread; 172-Colloid; 173-End sealing structure; 20 - Support frame; 21 - Support column; 22 - Horizontal frame; 30-Tuning assembly; 31-First tuning mechanism; 311-Center column; 312-First telescopic cylinder; 313-Second telescopic cylinder; 314-First push panel; 315-Second push panel; 32-Second tuning mechanism; 321-Reaction backrest; 322-Third telescopic cylinder; 323-Push back plate; 324-Roller. Detailed Implementation

[0011] The method for on-site fabrication of flexible steel cages provided by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0012] The main technical problem solved by this invention is how to prepare flexible steel cages in low-headroom construction environments. The technical means adopted is to first prepare flexible steel cage mesh into roll-type flexible steel cage assemblies, then transport them to the construction site, and then set up two roll-type flexible steel cage assemblies in parallel, and simultaneously unfold, bend, and splice the flexible steel cage mesh to prepare the flexible steel cage. The roll-type flexible steel cage assembly occupies less construction space, and when the flexible steel cage is unfolded and lowered, the prepared flexible steel cage is simultaneously lowered into the pile hole, which can fully adapt to low-headroom construction environments.

[0013] like Figure 1 As shown, the roll-type flexible rebar cage assembly 10 includes a roll 11 and a flexible rebar cage mesh 12 wound on the roll 11. The flexible rebar cage mesh 12 includes several longitudinal bars 13 and several stirrups 14. The longitudinal bars 13 and stirrups 14 are perpendicular and arranged in a grid pattern. The longitudinal bars 13 and stirrups 14 are fixed at their intersections, which can be done by binding or welding. The longitudinal bars 13 are steel strands, and the stirrups 14 are ordinary ribbed steel bars. The flexible rebar cage mesh 12 can be coiled along the longitudinal bars. As an example, the roll 11 is provided with snap-fit ​​connectors 15 at intervals equal to the number of longitudinal bars. One end of the steel strand is fixed to the roll through the snap-fit ​​connector 15. The snap-fit ​​connector 15 can be implemented using existing technology, as long as it can lock and fix the end of the steel strand. A baffle is also provided at the end of the roll 11 to facilitate the accommodation of the flexible rebar cage mesh. The roll is rotatably connected to the frame through a rotating shaft, and the rotation of the roll is controlled by a drive mechanism. The ends of the steel strands can also be equipped with steel strand connecting sleeves 16 for splicing and extending longitudinal reinforcement. For clearer display, Figure 2 , Figure 3 , Figure 5 and Figure 7 The rolled flexible steel cage assembly 10 in the image only shows the rolled flexible steel cage mesh 12, and does not show the other components of the rolled flexible steel cage assembly 10.

[0014] Combination Figure 2 and Figure 3 As shown, the flexible steel cage mesh includes 4 longitudinal bars, and the flexible steel cage after the two flexible cage meshes are bent and spliced ​​together has 8 longitudinal bars.

[0015] The following is combined with Figures 1 to 3 The preparation method is further described below. The preparation method includes the following steps: Step 1: Roll up the flexible steel cage mesh 12 along the longitudinal bars 13 and coil it on the drum 11 to form a drum-type flexible steel cage assembly 10; the flexible steel cage mesh 12 includes several longitudinal bars 13 and several stirrups 14, the longitudinal bars are steel strands, and the stirrups are arranged in parallel at intervals and perpendicular to the longitudinal bars. Step 2: Transport the roll-type flexible steel cage assembly 10 to the construction site, and install two roll-type flexible steel cage assemblies 10 symmetrically above the pile hole using a bracket. The roll and the bracket are rotatably connected, and a drive mechanism for controlling the rotation of the roll is installed. Step 3: The drum is rotated by the drive mechanism, and the flexible steel cage mesh 12 on the two drum-type flexible steel cage assemblies 10 is simultaneously unfolded along the longitudinal bars, so that the height of the stirrups 14 of the two flexible steel cage mesh assemblies 12 matches. Step 4: Bend the stirrups 14 of the two unfolded flexible steel cage mesh 12 into semicircles, and lap the two ends of the stirrups of the two semicircles. After splicing and fixing the lap joint, a flexible steel cage 1 is formed. When the flexible steel cage mesh 12 coiled on the drum is unfolded along the longitudinal reinforcement, the flexible steel cage is lowered synchronously along the pile hole. Step 5: Repeat steps 3 and 4 until the height of the flexible steel cage 1 meets the requirements. Pour concrete into the pile hole, then cut the longitudinal reinforcement and remove the remaining roll-type flexible steel cage assembly 10 to complete the construction.

[0016] The flexible rebar cage fabrication method provided in this embodiment uses a flexible rebar cage mesh 12 to fabricate a rebar cage 1. The longitudinal reinforcement 13 of the flexible rebar cage mesh 12 is made of steel strand, allowing the flexible rebar cage mesh 12 to be rolled up along the longitudinal reinforcement 13 and coiled on a drum 11. The resulting drum-type flexible rebar cage assembly 10 occupies little space, facilitating storage and transportation. Moreover, the drum-type flexible rebar cage assembly 10 can be used in indoor low-headroom environments by gradually unfolding the flexible rebar cage mesh 12 along the longitudinal reinforcement 13, bending the stirrups 14 to form a semi-circle, and splicing and fixing the two semi-circular stirrups to form the flexible rebar cage 1. The flexible rebar cage 1 is lowered simultaneously during the unfolding of the flexible rebar cage mesh 12. This construction method can fabricate flexible rebar cages on-site under low-headroom conditions, eliminating the need for segmented hoisting and welding of the rebar cage. This avoids the problem of numerous welding points in the segmented welding of longitudinal reinforcement in conventional construction under low-headroom conditions. The longitudinal reinforcement of the overall structure can ensure the overall quality of the pile body, and has the advantages of high construction efficiency, low material consumption, and low cost.

[0017] Combination Figures 1 to 4 As shown, after two flexible steel cage mesh panels are bent and spliced ​​together to form a flexible steel cage, it is necessary to ensure that the specifications, spacing, and quantity of the longitudinal bars of the flexible steel cage mesh panels, as well as the specifications and spacing of the stirrups, match the flexible steel cage. It is also necessary to ensure that the length of the stirrup ends (exceeding the length of the longitudinal bars) meets certain requirements. The sum of the number of longitudinal bars 13 in the two flexible steel cage mesh panels 12 is consistent with the number of longitudinal bars in the final flexible steel cage. The stirrups 14 are horizontally arranged, and the heights of the two flexible steel cage mesh panels 12 correspond. For example, when the designed number of longitudinal bars in the flexible steel cage is... x The spacing of the longitudinal reinforcement is d The perimeter of the ring stirrup is lAt that time, the length of the stirrups in the flexible steel cage mesh 12 is... l +∆ l The number of longitudinal bars in the flexible steel cage mesh 12 is x / 2, Spacing is d The protruding lengths at both ends are 0.5 mm. d 0.5 d +∆ l , where ∆ l This refers to the lap length of the stirrups.

[0018] In one specific embodiment, combined with Figure 5 and Figure 6 As shown, the first end of the stirrup of the flexible steel cage mesh 12 is provided with a stirrup connecting sleeve 17. The first end of the stirrup connecting sleeve 17 is provided with an internal thread 171, and the second end is provided with a cavity containing a high-strength fast-acting gel 172, which is sealed by a sealing structure 173. The high-strength fast-acting gel 172 can be implemented using existing technology. The first end of the stirrup is provided with an external thread, and the first end of the stirrup connecting sleeve is threadedly connected to the first end of the stirrup. In step two, when the two roll-type flexible steel cage assemblies 10 are symmetrically installed above the pile hole using a bracket, the ends of the flexible steel cage mesh with connecting sleeves are reversed, that is, the end of one flexible steel cage mesh with a connecting sleeve corresponds to the end of the other steel cage mesh without a connecting sleeve. In step four, the two semi-circular stirrups are overlapped at both ends, and the overlap is spliced ​​and fixed. Alternatively, the second end of the stirrup pierces the sealing structure 173 of the stirrup connecting sleeve 17 of the other stirrup and is inserted into the gel, and fixed by adhesive bonding. In this embodiment, a stirrup connecting sleeve 17 is provided at one end of the stirrup, which facilitates the quick splicing and fixing of the two ends of the stirrup and improves construction efficiency.

[0019] In one specific embodiment, combined with Figures 7 to 11As shown, in step four, the stirrups 14 of the two unfolded flexible steel cage mesh panels 12 are bent into semicircles. This is done using a flexible steel cage on-site fabrication device, which includes a support frame 20 and a bending adjustment assembly 30. The support frame 20 includes several support columns 21 and a horizontal frame 22, which is mounted on the support columns 21. The bending adjustment assembly 30 includes a first bending adjustment mechanism 31 and two second bending adjustment mechanisms 32. The first bending adjustment mechanism 31 includes a central column 311, two first telescopic cylinders 312, two second telescopic cylinders 313, two first jacking panels 314, and two second jacking panels 315. The top of the central column 311 is fixedly connected to the horizontal frame 22 and located directly above the pile hole. Two first telescopic cylinders 312 are symmetrically arranged along the central column 311 and located in the first direction, and two second telescopic cylinders 313 are symmetrically arranged along the central column 311 and located in the second direction. The first direction is perpendicular to the second direction. One end of the first telescopic cylinder 312 is fixedly connected to the central column 311, and the other end is fixedly connected to the first jacking panel 314. One end of the second telescopic cylinder 313 is fixedly connected to the central column 311, and the other end is fixedly connected to the second jacking panel 315. The ends of the first jacking panel 314 and the second jacking panel 315 away from the central column 311 are both arc segments with a radius of R, where R is the radius of the flexible steel cage. Under the coordinated action of the first telescopic cylinders 312 and the second telescopic cylinders 313, the arc segments of the two first jacking panels 314 and the two arc segments of the two second jacking panels 315 can form a circle with a radius of R. The second bending mechanism 32 includes a reaction backrest 321, a third telescopic cylinder 322, and a push-back plate 323. The reaction backrest 321 is mounted on the support frame 20. One end of the third telescopic cylinder 322 is fixedly connected to the reaction backrest 321, and the other end is fixedly connected to the push-back plate 323. The push-back plate 323 has an arc-shaped groove on the side away from the third telescopic cylinder 322. The two second bending mechanisms 32 are symmetrically arranged along the central column 311. Under the action of the third telescopic cylinder 322, the two push-back plates 323 can encircle the first bending mechanism 31. In step four, the stirrups 14 of the two unfolded flexible steel cage meshes 12 are bent into semicircles, specifically including the following steps: A1. Combination Figure 7 and Figure 8 As shown, the first telescopic cylinder 312 and the second telescopic cylinder 313 work together to make the arc segments of the two first push panels 314 and the arc segments of the two second push panels 315 form a circle with a radius of R. The third telescopic cylinder 322 is in the retracted state. The unfolded flexible steel cage mesh 12 is lowered between the first push panel 314 and the push back plate 323. The heights of the stirrups of the two flexible steel cage mesh 12 are matched. A2. Combination Figures 7 to 9As shown, the third telescopic cylinder 322 extends, causing the push back plate 323 to push the stirrup 14 to move, so that the stirrup 14 abuts against the second push panel 315 and bends into a semicircle. The ends of the two semicircular stirrups overlap, and the overlap part corresponds to the second push panel 315. A3. Combination Figures 7 to 10 As shown, the second telescopic cylinder 313 retracts to retract the second push panel 315, and the third push cylinder retracts to retract the push back plate 323, freeing up operating space to fix the lap joint of the stirrups. This can be done by welding or binding wire to form a flexible steel cage. Then, the first telescopic cylinder 312 retracts to retract the first push panel 314, preparing for the lowering of the flexible steel cage.

[0020] In one specific embodiment, such as Figures 8 to 11 As shown, rollers 324 are provided at both ends of the push back plate 323. When the third telescopic cylinder 322 extends, the rollers 324 push the stirrups to move, which can reduce friction when the stirrups bend.

[0021] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0022] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for on-site fabrication of a flexible reinforcing cage, characterized in that, The preparation method includes the following steps: Step 1: Roll up the flexible steel cage mesh along the longitudinal bars and coil it onto a drum to form a drum-type flexible steel cage assembly; the flexible steel cage mesh includes several longitudinal bars and several stirrups, the longitudinal bars are steel strands, and the stirrups are arranged parallel and spaced apart and perpendicular to the longitudinal bars, the number of longitudinal bars is [number missing]. x / 2, where x This is the design value for the number of longitudinal bars in the flexible steel cage; when the longitudinal bar spacing is d and the circumference of the ring stirrup is l, the setting length of the stirrups in the flexible steel cage mesh is l+Δl, and the extension lengths at both ends are 0.5d and 0.5d+Δl, respectively, where Δl is the stirrup lap length; The first end of the stirrup of the flexible steel cage mesh is provided with a stirrup connecting sleeve; the first end of the stirrup connecting sleeve is provided with an internal thread, and the second end is provided with a cavity containing colloid, which is sealed by a sealing structure; the first end of the stirrup connecting sleeve is threadedly connected to one end of the stirrup. Step 2: Transport the roll-type flexible rebar cage assembly to the construction site. Use a bracket to symmetrically install two roll-type flexible rebar cage assemblies above the pile hole. The connecting sleeves of the two rebar cage meshes are set in opposite directions. The end of the flexible rebar cage mesh with a connecting sleeve corresponds to the end of the other rebar cage mesh without a connecting sleeve. The roll is rotatably connected to the bracket. Install a drive mechanism to control the rotation of the roll. Step 3: The drum is rotated by the drive mechanism, and the flexible steel cage mesh on the two drum-type flexible steel cage assemblies is simultaneously unfolded along the longitudinal bars, so that the stirrup heights of the two flexible steel cage meshes match. Step 4: Bend the stirrups of the two unfolded flexible steel cage meshes into semicircles. The second end of each stirrup pierces the end cap structure of the stirrup connecting sleeve of the other stirrup and inserts it into the adhesive. Fix it by bonding with the adhesive.

2. The method for on-site fabrication of flexible steel cages as described in claim 1, characterized in that, In step four, the stirrups of the two unfolded flexible steel cage meshes are bent into semicircles, and the operation is carried out using a flexible steel cage on-site fabrication equipment; the flexible steel cage on-site fabrication equipment includes a support frame and a bending adjustment component; the support frame includes several support columns and a horizontal frame, and the horizontal frame is set on the support columns; the bending adjustment component includes a first bending adjustment mechanism and two second bending adjustment mechanisms. The first adjustment mechanism includes a central column, two first telescopic hydraulic cylinders, two second telescopic hydraulic cylinders, two first jacking panels, and two second jacking panels. The top of the central column is fixedly connected to the horizontal frame and located directly above the pile hole. The two first telescopic hydraulic cylinders and the two second telescopic hydraulic cylinders are arranged around the central column and radially along the central column. The two first telescopic hydraulic cylinders and the two second telescopic hydraulic cylinders are symmetrically arranged along the central column. One end of the first telescopic hydraulic cylinder is fixedly connected to the central column, and the other end is fixedly connected to the first jacking panel. One end of the second telescopic hydraulic cylinder is fixedly connected to the central column, and the other end is fixedly connected to the second jacking panel. The ends of the first and second jacking panels away from the central column are both arc segments with a radius of R, where R is the radius of the flexible steel cage. Under the coordinated action of the first and second telescopic hydraulic cylinders, the arc surfaces of the two first jacking panels and the two second jacking panels can form a circle with a radius of R. The second bending mechanism includes a reaction backrest, a third telescopic cylinder, and a push back plate. The reaction backrest is mounted on the support frame. One end of the third telescopic cylinder is fixedly connected to the reaction backrest, and the other end is fixedly connected to the push back plate. The push back plate has an arc-shaped groove on the side away from the third telescopic cylinder. The two second bending mechanisms are symmetrically arranged along the central column. Under the action of the third telescopic cylinder, the two push back plates can encircle the first bending mechanism. In step four, the stirrups of the two unfolded flexible steel mesh cages are bent into semicircles, specifically including the following steps: A1. Under the coordinated action of the first telescopic cylinder and the second telescopic cylinder, the arc segments of the two first push panels and the arc segments of the two second push panels form a circle with a radius of R. The third telescopic cylinder is in the retracted state. The unfolded flexible steel cage mesh is lowered between the first push panel and the push back plate. The height of the stirrups of the two flexible steel cage meshes are matched. A2. The third telescopic cylinder extends, causing the push back plate to push the stirrups to move, so that the stirrups abut against the second push panel and bend into a semicircle. The ends of the two semicircular stirrups overlap, and the overlap part corresponds to the second push panel. A3. The second telescopic cylinder retracts to retract the second jacking panel, and the third jacking cylinder retracts to retract the jacking back plate, freeing up operating space. The lap joints of the stirrups are then fixed and connected by welding or binding wire to form a flexible steel cage. Then, the first telescopic cylinder retracts to retract the first jacking panel, preparing for the lowering of the flexible steel cage.

3. The method for on-site fabrication of flexible steel cages as described in claim 2, characterized in that, Rollers are installed at both ends of the push-back plate. When the third telescopic cylinder is extended, the rollers push the stirrups to move.

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