Flexible reinforcement cage on-site preparation method

Abstract

The invention discloses an on-site preparation method of a flexible reinforcement cage, which comprises the following steps of: rolling up a flexible reinforcement cage mesh along a longitudinal bar and winding the flexible reinforcement cage mesh on a winding drum to form a winding drum type flexible reinforcement cage assembly; the two reel type flexible reinforcement cage assemblies are symmetrically installed above the pile hole; the flexible reinforcement cage meshes on the two reel type flexible reinforcement cage assemblies are synchronously unfolded along the longitudinal bars, so that the stirrup heights of the two flexible reinforcement cage meshes are matched; and the stirrups of the two unfolded flexible reinforcement cage meshes are bent to form semicircles, the two ends of the two semicircular stirrups are arranged in a lap joint mode, and the lap joint positions are spliced and fixed to form the flexible reinforcement cage. According to the method, the longitudinal bars of the flexible reinforcement cage meshes adopt the steel strands and are rolled up along the longitudinal bars, the occupied space is small, storage and transportation are convenient, the two rolled-up flexible reinforcement cage meshes can be unfolded, bent, spliced and put down in the low clearance environment, and the integrated longitudinal bars can guarantee the overall quality of the pile body.

Description

Technical Field

[0001] The invention relates to the technical field of underground pile foundation steel cages, and in particular to an on-site preparation method of a flexible steel cage adapted to a low-headroom construction environment. Background Art

[0002] At present, urban organic renewal is an important means to promote urban development. Repair, renovate and redevelop existing old buildings and historical buildings to recreate urban vitality and vitality, thereby improving the quality of life and environment in the city and enhancing the driving force of urban development. In the renovation of existing buildings, it is often necessary to carry out pile foundation construction indoors on the basis of retaining the original buildings. There are problems such as limited construction height and narrow construction space, which is not conducive to the entry of large machinery. When it comes to the construction of steel cages, segmented binding, segmented hoisting, and segmented welding are often used, which has problems such as low efficiency, long time consumption, and high labor and material costs. Summary of the invention

[0003] In view of the above-mentioned problems existing in the construction of steel cages in low-headroom construction environments, the present invention proposes an on-site preparation method for a flexible steel cage, which can avoid the segmented construction of the steel cage, effectively improve the construction efficiency, and ensure the construction quality of the steel cage.

[0004] In order to solve the above technical problems, the present invention includes the following technical solutions:

[0005] A method for preparing a flexible steel cage on site, the method comprising the following steps:

[0006] Step 1, rolling up the flexible steel cage mesh along the longitudinal reinforcement and winding it on a reel to form a reel-type flexible steel cage assembly; the flexible steel cage mesh includes a plurality of longitudinal reinforcements and a plurality of stirrups, the longitudinal reinforcements are steel strands, the stirrups are arranged in parallel and at intervals and perpendicular to the longitudinal reinforcements, and the number of longitudinal reinforcements is x / 2, wherein x is the design value of the number of longitudinal reinforcements of the flexible steel cage;

[0007] Step 2: transport the reel-type flexible steel cage assembly to the construction site, symmetrically install two reel-type flexible steel cage assemblies above the pile hole through a bracket, rotate the reel and the bracket, and install a driving mechanism for controlling the rotation of the reel;

[0008] Step 3: The reel is rotated by a driving mechanism, and the flexible steel cage meshes on the two reel-type flexible steel cage assemblies are simultaneously unfolded along the longitudinal reinforcements, so that the stirrup heights of the two flexible steel cage meshes are matched;

[0009] Step 4: bend the stirrups of the two unfolded flexible steel cage meshes to form a semicircle, overlap the two semicircular stirrups at both ends, and splice and fix the overlaps to form a flexible steel cage.

[0010] Furthermore, a stirrup connecting sleeve is provided at the first end of the stirrup of the flexible steel cage mesh; an internal thread is provided at the first end of the stirrup connecting sleeve, a cavity is provided at the second end, a colloid is provided in the cavity, and the cavity is sealed by an end-sealing structure; the first end of the stirrup connecting sleeve is threadedly connected to one end of the stirrup;

[0011] In step 2, when two reel-type flexible steel cage assemblies are symmetrically installed above the pile hole through the bracket, the connecting sleeves of the two steel cage meshes are set in opposite directions;

[0012] In step 4, two semicircular stirrups are overlapped at both ends, and the overlapped parts are spliced ​​and fixed. The second end of each stirrup pierces the end capping structure of the stirrup connecting sleeve of the other stirrup and is inserted into the colloid, and is fixed by colloid bonding.

[0013] Further, in step 4, the stirrups of the two unfolded flexible steel cage meshes are bent into a semicircle, and the operation is performed using a flexible steel cage on-site preparation device; the flexible steel cage on-site preparation device includes a support frame and a bending adjustment component; the support frame includes a plurality of support columns and a horizontal frame, and the horizontal frame is arranged on the support columns; the bending adjustment component includes a first bending adjustment mechanism and two second bending adjustment mechanisms;

[0014] The first bending adjustment mechanism includes a central column, two first telescopic cylinders, two second telescopic cylinders, two first push panels and two second push panels; the top of the central column is fixedly connected to the horizontal frame and is located directly above the pile hole, the two first telescopic cylinders and the two second telescopic cylinders surround the central column and are radially arranged along the central column, the two first telescopic cylinders are symmetrically arranged along the central column, and the two second telescopic cylinders are symmetrically arranged along the central column; one end of the first telescopic cylinder is fixedly connected to the central column, and the other end is fixedly connected to the first push panel; one end of the second telescopic cylinder is fixedly connected to the central column, and the other end is fixedly connected to the second push panel; the ends of the first push panel and the second push panel away from the central column are both arc segments with a radius of R, R is the radius of the flexible steel cage, and the first telescopic cylinder and the second telescopic cylinder can cooperate to make the arc surfaces of the two first push panels and the arc surfaces of the two second push panels form a circle with a radius of R;

[0015] The second bending adjustment mechanism includes a reaction backrest, a third telescopic oil cylinder and a push back plate; the reaction backrest is arranged on the support frame, one end of the third telescopic oil cylinder is fixedly connected to the reaction backrest, and the other end is fixedly connected to the push back plate, and a circular arc groove is arranged on the side of the push back plate away from the third telescopic oil cylinder; the two second bending adjustment mechanisms are symmetrically arranged along the central column, and under the action of the third telescopic oil cylinder, the two push back plates can embrace the first bending adjustment mechanism;

[0016] In step 4, the stirrups of the two unfolded flexible steel cage meshes are bent into a semicircle, which specifically includes the following steps:

[0017] A1. The first telescopic cylinder and the second telescopic cylinder work together to make 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 a retracted state. The unfolded flexible steel cage mesh is lowered between the first push panel and the push back plate. The heights of the stirrups of the two flexible steel cage meshes match.

[0018] A2. The third telescopic cylinder is extended to make the push back plate push the stirrups to move, so that the stirrups are against the second push panel and bent into a semicircle. The ends of the two semicircular stirrups overlap, and the overlapped part corresponds to the second push panel.

[0019] A3. The second telescopic cylinder is retracted to retract the second jacking panel, and the third jacking cylinder is retracted to retract the jacking back plate, freeing up operating space, and the overlapping parts of the stirrups are fixedly connected, which can be fixed by welding or tying wire to form a flexible steel cage; then the first telescopic cylinder is retracted to retract the first jacking panel, preparing for the lowering of the flexible steel cage.

[0020] Furthermore, rollers are provided at both ends of the push back plate, and when the third telescopic oil cylinder is extended, the rollers push the stirrups to move.

[0021] Due to the adoption of the above technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the on-site preparation method of the flexible steel cage provided by the present invention adopts steel strands as the longitudinal reinforcement of the flexible steel cage mesh, so that the flexible steel cage mesh can be rolled up along the longitudinal reinforcement, which occupies a small space and is convenient for storage and transportation, and can gradually unfold two parallel flexible steel cage meshes along the longitudinal reinforcement in a low-headroom environment indoors, adjust the stirrups into a semicircle and fix the two semicircular ends to make a flexible steel cage, and the flexible steel cage is lowered synchronously during the unfolding of the flexible steel mesh. The construction method can prepare the flexible steel cage on-site under low-headroom conditions, avoiding the problem of numerous welding points in the segmented lifting and segmented welding of the longitudinal reinforcement in conventional construction, and the integrated longitudinal reinforcement can ensure the overall quality of the pile body. The method also has the advantages of high construction efficiency, less consumables and low cost; by adopting flexible steel cage manufacturing equipment to bend the stirrups of the unfolded flexible steel cage mesh into a semicircle, the efficiency and quality of the stirrup bending and forming are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of a reel-type flexible steel cage assembly in one embodiment of the present invention;

[0023] Figure 2 Schematic diagram of winding of a flexible steel cage mesh in one embodiment of the present invention;

[0024] Figure 3It is a schematic diagram of two flexible steel cage meshes being unfolded, bent, and spliced ​​to form a flexible steel cage in one embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the longitudinal reinforcement spacing and the protruding length of the stirrup ends of two flexible steel cage meshes in one embodiment of the present invention;

[0026] Figure 5 Schematic diagram of a sleeve provided at the end of the stirrup of a reel-type flexible steel cage assembly

[0027] Figure 6 It is a schematic diagram of the structure of the sleeve;

[0028] Figure 7 A schematic diagram of manufacturing a flexible steel cage using a flexible steel cage manufacturing device provided in one embodiment of the present invention;

[0029] Figure 8 This is a diagram showing the position relationship between the flexible steel cage mesh and the bending adjustment device after it is unfolded;

[0030] Fig. 9 A schematic diagram of adjusting the middle part of the stirrup into an arc segment by using a multi-telescopic end adjustment device and a first telescopic adjustment mechanism;

[0031] Fig.10 A schematic diagram of adjusting the two ends of the stirrup into arc segments by using a multi-telescopic end adjustment device, a second telescopic adjustment mechanism, and a third telescopic adjustment mechanism;

[0032] Fig.11 It is a schematic diagram of resetting the multi-telescopic end adjustment device, the first telescopic adjustment mechanism, the second telescopic adjustment mechanism, and the third telescopic adjustment mechanism.

[0033] The numbers in the figure are as follows:

[0034] 1-Flexible steel cage;

[0035] 10-roll-type flexible steel cage assembly; 11-roll; 12-flexible steel cage mesh; 13-longitudinal reinforcement; 14-stirrup; 15-snap connector; 16-steel strand connection sleeve; 17-stirrup connection sleeve; 171-internal thread; 172-colloid; 173-end capping structure;

[0036] 20-support frame; 21-support column; 22-horizontal frame;

[0037] 30-bending component; 31-first bending adjustment mechanism; 311-center column; 312-first telescopic cylinder; 313-second telescopic cylinder; 314-first pushing panel; 315-second pushing panel; 32-second bending adjustment mechanism; 321-reaction backrest; 322-third telescopic cylinder; 323-pushing back plate; 324-roller. DETAILED DESCRIPTION

[0038] The following is a further detailed description of the on-site preparation method of the flexible steel cage provided by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer in conjunction with the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0039] The main technical problem solved by the present invention is how to prepare a flexible steel cage in a low-headroom construction environment. The technical means adopted are: first preparing the flexible steel cage mesh into a roll-type flexible steel cage assembly, then transporting it to the construction site, and then arranging two roll-type flexible steel cage assemblies in parallel, and synchronously unfolding, bending, and splicing 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 synchronously lowered into the pile hole, which can fully adapt to the low-headroom construction environment.

[0040] like Figure 1 As shown, the reel-type flexible steel cage assembly 10 includes a reel 11 and a flexible steel cage mesh 12 wound on the reel 11. The flexible steel cage mesh 12 includes a plurality of longitudinal bars 13 and a plurality of stirrups 14. The longitudinal bars 13 and stirrups 14 are arranged vertically and in a grid shape. The longitudinal bars 13 and stirrups 14 are fixed at the intersection and can be fixed by binding or welding. The longitudinal bars 13 are steel strands, and the stirrups 14 are ordinary ribbed steel bars. The flexible steel cage mesh 12 can be coiled along the longitudinal bars. As an example, the reel 11 is provided with the same number of snap connectors 15 as the longitudinal bars at intervals. One end of the steel strand is fixed to the reel through the snap connector 15. The snap connector 15 can be implemented by existing technology as long as the end of the steel strand can be locked and fixed; a baffle is also provided at the end of the reel 11 to facilitate the accommodation of the flexible steel cage mesh; the reel is rotatably connected to the frame through a rotating shaft, and the rotation of the reel is controlled by setting a driving mechanism. The ends of the steel strands can also be provided with steel strand connection sleeves 16 for longitudinal reinforcement splicing and extension. Figure 2 , Figure 3 , Figure 5 and Figure 7 The rolled-up flexible steel cage assembly 10 in the figure only shows the rolled-up flexible steel cage mesh 12, and the remaining components of the rolled-up flexible steel cage assembly 10 are not shown.

[0041] 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 adjusted and spliced ​​has 8 longitudinal bars.

[0042] Combine the following Figures 1 to 3The preparation method is further described as shown. The preparation method comprises the following steps:

[0043] Step 1: Roll up the flexible steel cage mesh 12 along the longitudinal reinforcement 13 and coil it on the reel 11 to form a reel-type flexible steel cage assembly 10; the flexible steel cage mesh 12 includes a plurality of longitudinal reinforcements 13 and a plurality of stirrups 14, the longitudinal reinforcements are steel strands, and the stirrups are arranged in parallel and at intervals and perpendicular to the longitudinal reinforcements;

[0044] Step 2: transport the reel-type flexible steel cage assembly 10 to the construction site, symmetrically install two reel-type flexible steel cage assemblies 10 above the pile hole through a bracket, rotate the reel and the bracket, and install a driving mechanism for controlling the rotation of the reel;

[0045] Step 3: The reel is rotated by the driving mechanism, and the flexible steel cage meshes 12 on the two reel-type flexible steel cage assemblies 10 are simultaneously unfolded along the longitudinal reinforcement, so that the heights of the stirrups 14 of the two flexible steel cage meshes 12 are matched;

[0046] Step 4: bend the stirrups 14 of the two unfolded flexible steel cage meshes 12 to form a semicircle, overlap the two semicircular stirrups at both ends, and splice and fix the overlaps to form a flexible steel cage 1; when the flexible steel cage mesh 12 wound on the drum is unfolded along the longitudinal reinforcement, the flexible steel cage is synchronously lowered along the pile hole;

[0047] Step 5: Repeat steps 3 and 4 until the height of the flexible steel cage 1 meets the requirements, pour concrete in the pile hole, then cut off the longitudinal reinforcement, remove the remaining reel-type flexible steel cage assembly 10, and complete the construction.

[0048] The on-site preparation method of the flexible steel cage provided in this embodiment adopts a flexible steel cage mesh 12 to make a steel cage 1, and the longitudinal reinforcement 13 of the flexible steel cage mesh 12 adopts a steel strand, so that the flexible steel cage mesh 12 can be rolled up along the longitudinal reinforcement 13 and coiled on the reel 11, and the formed reel-type flexible steel cage assembly 10 occupies a small space and is convenient for storage and transportation; moreover, the reel-type flexible steel cage assembly 10 can gradually unfold the flexible steel cage mesh 12 along the longitudinal reinforcement 13 in an indoor low-headroom environment, and adjust the stirrup 14 to form a semicircle, and splice and fix two semicircular stirrups to form a flexible steel cage 1, and the flexible steel cage 1 is lowered synchronously during the unfolding process of the flexible steel mesh 12. This construction method can prepare a flexible steel cage on-site under low-headroom conditions, without the need to hoist and weld the steel cage in sections and batches, avoiding the problem of numerous welding points in the segmented welding of longitudinal reinforcement in conventional construction under low headroom, and the longitudinal reinforcement of the overall structure can ensure the overall quality of the pile body, with the advantages of high construction efficiency, less consumables and low cost.

[0049] Combination Figures 1 to 4As shown, two flexible steel cage meshes are adjusted and spliced ​​to form a flexible steel cage. It is necessary to ensure that the specifications, spacing and number of the longitudinal bars of the flexible steel cage mesh, the specifications and spacing of the stirrups match the flexible steel cage, and 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 of the two flexible steel cage meshes 12 is consistent with the number of longitudinal bars of the final flexible steel cage, and the stirrups 14 are arranged horizontally and the heights of the two flexible steel cage meshes 12 correspond. As an example, when the number of longitudinal bars of the designed flexible steel cage is x, the spacing of the longitudinal bars is d, and the circumference of the annular stirrups is l, the setting length of the stirrups of the flexible steel cage mesh 12 is l+Δl, the number of longitudinal bars of the flexible steel cage mesh 12 is x / 2, the spacing is d, and the protruding lengths at both ends are 0.5d and 0.5d+Δl, respectively, where Δl is the stirrup lap length.

[0050] In a specific embodiment, in combination 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, in which a high-strength fast gel 172 is provided and sealed by an end-sealing structure 173, wherein the high-strength fast gel 172 can be realized by 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 2, when two roll-type flexible steel cage assemblies 10 are symmetrically installed above the pile hole by a bracket, one end of the flexible steel cage mesh is provided with a connecting sleeve and is reversely arranged, that is, one of the flexible steel cage meshes is provided with a connecting sleeve corresponding to the end of the other steel cage mesh that is not provided with a connecting sleeve. In step 4, the two semicircular stirrups are overlapped at both ends, and the overlap is spliced ​​and fixed, and the second end of the stirrup pierces the end-sealing structure 173 of the stirrup connecting sleeve 17 of the other stirrup and is inserted into the colloid, and is bonded and fixed by the colloid 173. In this embodiment, a stirrup connecting sleeve 17 is provided at one end of the stirrup, so that the two ends of the stirrup can be quickly spliced ​​and fixed, thereby improving construction efficiency.

[0051] In a specific embodiment, in combination Figures 7 to 11As shown, in step 4, the stirrups 14 of the two unfolded flexible steel cage meshes 12 are bent into a semicircle, and the flexible steel cage on-site preparation equipment is used for operation, and the flexible steel cage on-site preparation equipment includes a support frame 20 and a bending adjustment component 30. The support frame 20 includes a plurality of support columns 21 and a horizontal frame 22, and the horizontal frame 22 is arranged on the support columns 21. The bending adjustment component 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 push panels 314 and two second push panels 315. The top of the center column 311 is fixedly connected to the horizontal frame 22 and is located directly above the pile hole. The two first telescopic cylinders 312 are symmetrically arranged along the center column 311 and are located in the first direction. The two second telescopic cylinders 313 are symmetrically arranged along the center column 311 and are located in the second direction, and the first direction is perpendicular to the second direction; one end of the first telescopic cylinder 312 is fixedly connected to the center column 311, and the other end is fixedly connected to the first push panel 314; one end of the second telescopic cylinder 313 is fixedly connected to the center column 311, and the other end is fixedly connected to the second push panel 315; the ends of the first push panel 314 and the second push panel 315 away from the center column 311 are both arc segments with a radius R, where R is the radius of the flexible steel cage. The first telescopic cylinder 312 and the second telescopic cylinder 313 can cooperate 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 R. The second bending mechanism 32 includes a reaction backrest 321, a third telescopic oil cylinder 322 and a push back plate 323. The reaction backrest 321 is arranged on the support frame 20, one end of the third telescopic oil cylinder 322 is fixedly connected to the reaction backrest 321, and the other end is fixedly connected to the push back plate 323, and a circular arc groove is arranged on the side of the push back plate 323 away from the third telescopic oil cylinder 322. The two second bending mechanisms 32 are symmetrically arranged along the central column 311, and under the action of the third telescopic oil cylinder 322, the two push back plates 323 can embrace the first bending mechanism 31. In step four, the stirrups 14 of the two unfolded flexible steel cage meshes 12 are bent into a semicircle, which specifically includes the following steps:

[0052] A1. Combination Figure 7 and Figure 8 As shown, the first telescopic oil cylinder 312 and the second telescopic oil cylinder 313 cooperate 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 R, the third telescopic oil cylinder 322 is in a retracted cylinder state, and the unfolded flexible steel cage mesh 12 is lowered between the first push panel 314 and the push back plate 323, and the heights of the stirrups of the two flexible steel cage meshes 12 match;

[0053] A2. Combination Figures 7 to 9As shown, the third telescopic oil cylinder 322 is extended to operate, so that the push back plate 323 pushes the stirrup 14 to move, so that the stirrup 14 abuts against the second push panel 315 and bends into a semicircle, and the ends of the two semicircular stirrups overlap, and the overlapped portion corresponds to the second push panel 315;

[0054] A3. Combination Figures 7 to 10 As shown, the second telescopic cylinder 313 is retracted to retract the second pushing panel 315, and the third pushing cylinder is retracted to retract the pushing back plate 323, freeing up operating space, and fixing the overlapping parts of the stirrups, which can be fixed by welding or tying with wires to form a flexible steel cage; then the first telescopic cylinder 312 is retracted to retract the first pushing panel 314, preparing for the lowering of the flexible steel cage.

[0055] In a specific embodiment, 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 is extended, the rollers 324 push the stirrups to move, which can reduce friction when the stirrups are bent.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0057] The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A method for preparing a flexible steel cage on site, characterized in that: The preparation method comprises the following steps: Step 1, rolling up the flexible steel cage mesh along the longitudinal reinforcement and winding it on a reel to form a reel-type flexible steel cage assembly; the flexible steel cage mesh includes a plurality of longitudinal reinforcements and a plurality of stirrups, the longitudinal reinforcements are steel strands, the stirrups are arranged in parallel and at intervals and perpendicular to the longitudinal reinforcements, and the number of longitudinal reinforcements is x / 2, wherein x is the design value of the number of longitudinal reinforcements of the flexible steel cage; Step 2: transport the reel-type flexible steel cage assembly to the construction site, symmetrically install two reel-type flexible steel cage assemblies above the pile hole through a bracket, rotate the reel and the bracket, and install a driving mechanism for controlling the rotation of the reel; Step 3: The reel is rotated by a driving mechanism, and the flexible steel cage meshes on the two reel-type flexible steel cage assemblies are simultaneously unfolded along the longitudinal reinforcements, so that the stirrup heights of the two flexible steel cage meshes are matched; Step 4: bend the stirrups of the two unfolded flexible steel cage meshes to form a semicircle, overlap the two semicircular stirrups at both ends, and splice and fix the overlaps to form a flexible steel cage.

2. The on-site preparation method of the flexible steel cage according to claim 1, characterized in that: 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, a colloid is provided in the cavity, and the cavity is sealed by an end-sealing structure; the first end of the stirrup connecting sleeve is threadedly connected to one end of the stirrup; In step 2, when two reel-type flexible steel cage assemblies are symmetrically installed above the pile hole through the bracket, the connecting sleeves of the two steel cage meshes are set in opposite directions; In step 4, two semicircular stirrups are overlapped at both ends, and the overlapped parts are spliced ​​and fixed. The second end of each stirrup pierces the end capping structure of the stirrup connecting sleeve of the other stirrup and is inserted into the colloid, and is fixed by colloid bonding.

3. The on-site preparation method of the flexible steel cage according to claim 1, characterized in that: In step 4, the stirrups of the two unfolded flexible steel cage meshes are bent into a semicircle, and the operation is performed using a flexible steel cage on-site preparation device; the flexible steel cage on-site preparation device includes a support frame and a bending adjustment component; the support frame includes a plurality of support columns and a horizontal frame, and the horizontal frame is arranged on the support columns; the bending adjustment component includes a first bending adjustment mechanism and two second bending adjustment mechanisms; The first bending adjustment mechanism includes a central column, two first telescopic cylinders, two second telescopic cylinders, two first push panels and two second push panels; the top of the central column is fixedly connected to the horizontal frame and is located directly above the pile hole, the two first telescopic cylinders and the two second telescopic cylinders surround the central column and are radially arranged along the central column, the two first telescopic cylinders are symmetrically arranged along the central column, and the two second telescopic cylinders are symmetrically arranged along the central column; one end of the first telescopic cylinder is fixedly connected to the central column, and the other end is fixedly connected to the first push panel; one end of the second telescopic cylinder is fixedly connected to the central column, and the other end is fixedly connected to the second push panel; the ends of the first push panel and the second push panel away from the central column are both arc segments with a radius of R, R is the radius of the flexible steel cage, and the first telescopic cylinder and the second telescopic cylinder can cooperate to make the arc surfaces of the two first push panels and the arc surfaces of the two second push panels form a circle with a radius of R; The second bending adjustment mechanism includes a reaction backrest, a third telescopic oil cylinder and a push back plate; the reaction backrest is arranged on the support frame, one end of the third telescopic oil cylinder is fixedly connected to the reaction backrest, and the other end is fixedly connected to the push back plate, and a circular arc groove is arranged on the side of the push back plate away from the third telescopic oil cylinder; the two second bending adjustment mechanisms are symmetrically arranged along the central column, and under the action of the third telescopic oil cylinder, the two push back plates can embrace the first bending adjustment mechanism; In step 4, the stirrups of the two unfolded flexible steel cage meshes are bent into a semicircle, which specifically includes the following steps: A1. The first telescopic cylinder and the second telescopic cylinder work together to make 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 a retracted state. The unfolded flexible steel cage mesh is lowered between the first push panel and the push back plate. The heights of the stirrups of the two flexible steel cage meshes match. A2. The third telescopic cylinder is extended to make the push back plate push the stirrups to move, so that the stirrups are against the second push panel and bent into a semicircle. The ends of the two semicircular stirrups overlap, and the overlapped part corresponds to the second push panel. A3. The second telescopic cylinder is retracted to retract the second jacking panel, and the third jacking cylinder is retracted to retract the jacking back plate, freeing up operating space, and the overlapping parts of the stirrups are fixedly connected, which can be fixed by welding or tying wire to form a flexible steel cage; then the first telescopic cylinder is retracted to retract the first jacking panel, preparing for the lowering of the flexible steel cage.

4. The on-site preparation method of the flexible steel cage according to claim 3, characterized in that: Rollers are arranged at both ends of the push back plate, and when the third telescopic oil cylinder is extended, the rollers push the stirrups to move.

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