A super deep foundation pit support is used perfusion pile reinforcement cage hoisting device and hoisting process

Abstract

This invention relates to pile body hoisting technology for cast-in-place piles, specifically a hoisting device and process for a reinforcing cage of cast-in-place piles used in ultra-deep foundation pit support. The invention utilizes the switching on and off of an electromagnet to move the movable plate closer to and away from the connecting plate. When approaching the connecting plate, the drive rod and connecting rod move the grab hook and claw outwards. During this outward movement, the claw swings outwards relative to the grab hook. After reaching the outermost position, it connects and fixes itself to the main reinforcement and stirrups of the reinforcing cage. By arranging multiple hoisting main structures along the length of the reinforcing cage in series, the invention ensures that the reinforcing cage does not deform during attitude adjustment. After attitude adjustment, the auxiliary hoisting equipment automatically disengages from the stirrups and main reinforcement at the bottom of the reinforcing cage through the gravity of its own hook.

Description

Technical Field

[0001] This invention relates to the technology of hoisting cast-in-place piles, specifically to a hoisting device and process for hoisting the reinforcing cage of cast-in-place piles. Background Technology

[0002] In modern building construction, due to the complexity of the foundation, concrete piles are required for foundation support. Current concrete pile construction techniques involve constructing the concrete pile and precast reinforcing cage separately within a bored borehole. The steps are as follows: first, the construction ground is leveled and hardened; then, the pile location is determined on the construction ground, and a pile hole is drilled; a crane is used to lower the reinforcing cage into the pile hole; a guide pipe is inserted into the pile hole for concrete pouring, filling the section of the pile hole containing the reinforcing cage and forming a concrete pile; after the concrete pile hardens, the top layer of inferior material is removed; a steel pipe is vertically hoisted and placed into the pile hole using a crane, with the bottom of the steel pipe in contact with the concrete pile surface; a guide pipe is inserted into the steel pipe for concrete pouring, filling the space inside the steel pipe and forming a steel pipe column; finally, soil is backfilled into the gaps in the pile hole outside the steel pipe column.

[0003] CN111847217A Rebar Cage Lifting Device and Method, CN114014145A A Reusable Rebar Cage Lifting Device, etc., all require manual unhooking after the lifting work is completed. This requires a person to stand under the hook to complete the unhooking action, which poses certain safety risks and is prone to safety accidents. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to automatically unhook the steel cage after hoisting to prevent safety accidents, and at the same time solve the problem that the steel cage cannot be lowered vertically during hoisting.

[0005] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention, which adopts the following technical solution:

[0006] A hoisting device and hoisting process for a cast-in-place pile reinforcement cage for ultra-deep foundation pit support, comprising at least two sets of hoisting main structures arranged along the length of the reinforcement cage, wherein the hoisting main structure includes a connecting component and a hoisting component;

[0007] The connecting assembly includes a connecting plate and a movable plate. Multiple connecting rods are rotatably mounted on the side of the connecting plate, and a gripping assembly is rotatably mounted on the top of the connecting rods. A drive rod is rotatably mounted on the side of the movable plate, and the drive rod is located on the top of the connecting rods. An electromagnet is mounted on the top of the connecting plate. The electromagnet is suitable for attracting the movable plate and causing it to move downward relative to the connecting plate.

[0008] The lifting assembly includes a connecting claw, which includes a hollow sleeve rod. The hollow sleeve rod passes through the movable plate and has a lifting ring at its top. A socket plate is provided at the bottom of the hollow sleeve rod. A hinge rod is rotatably mounted on the side of the socket plate. A sliding sleeve is installed at the free end of the hinge rod. The sliding sleeve is adapted to abut against the bottom of the movable plate. A return spring is fitted on the outer side of the hollow sleeve rod between the sliding sleeve and the socket plate. A through hole is provided on the connecting plate for the socket plate to pass through.

[0009] Preferably, the gripping assembly includes a gripping hook rotatably mounted to the connecting rod and a claw rotatably mounted to the drive rod;

[0010] The grab hook is suitable for connecting the main reinforcement bars of the steel cage. The grab hook has ear plates on both sides, and claws are rotatably installed on the two ear plates. The claws are suitable for connecting the stirrups of the steel cage.

[0011] Preferably, each of the ear plates located on both sides of the gripper hook is equipped with a folding plate, and each of the two folding plates is equipped with a limit pin. A guide groove is provided on the bottom side of the claw, which is suitable for the limit pin to swing left and right relative to the claw. The guide groove has an arc-shaped structure.

[0012] Preferably, a limiting plate is provided at the top of the hollow sleeve rod. The limiting plate is located on the outside of the hollow sleeve rod and is suitable for controlling the hinge point of the hinge rod itself to be in the through hole of the connecting plate when the electromagnet is not energized.

[0013] Preferably, the bottom of the connecting plate is provided with a limiting groove, which is suitable for limiting the position of the hinge rod. The hinge rod includes rod one and rod two, with one free end of rod one and rod two hinged together. The other free end of rod one is hinged to the bottom of the sliding sleeve, and the other free end of rod two is hinged to the side of the socket plate.

[0014] Preferably, the hoisting device further includes an auxiliary hoisting component, which includes a verticality retaining frame installed at the pile opening. The verticality retaining frame includes a frame body installed horizontally at the turning opening. The frame body is equipped with multiple manual drums and guide wheel sets. The guide wheel sets and manual drums are positioned correspondingly and are all arranged along the radial direction of the pile opening.

[0015] A traction rope is wound on a manual drum, and a sleeve is installed at the free end of the traction rope. The sleeve is suitable for clamping the top of the steel cage.

[0016] Preferably, the clamp includes two clamping plates, one end of which is connected by a pivot, and the other end of which is fixed by a connector. The connector is suitable for fixing the traction rope. A clamping area is provided on the opposite side of the clamping plates. The clamping area is suitable for clamping and fixing the stirrups of the steel cage. A limiting area is provided on both clamping plates. The limiting area is suitable for fixing the main reinforcement of the steel cage.

[0017] The hoisting process for the reinforcing cage of a cast-in-place pile is as follows:

[0018] Step 1: Preparation

[0019] Two crawler cranes were selected, one as the main lifting equipment and the other as the auxiliary lifting equipment;

[0020] Step 2: Installation of lifting equipment

[0021] Before lifting the reinforcing cage, finite element analysis is performed to determine the deformation location. A lifting device is then installed inside the reinforcing cage along its length, positioned at the deformation location. The installation steps for the lifting device are as follows:

[0022] After placing multiple hoisting devices inside the steel cage, align the positions of the hooks with the main reinforcement bars of the steel cage, and supply power to the electromagnets to make them magnetic. The electromagnets attract the movable plate, and the movable plate gradually approaches the connecting plate. The hooks and claws are moved outward via the drive rod and connecting rod, so that the hooks and the main reinforcement bars of the steel cage are matched. When the claws move outward, they will swing relative to the hooks, so that the top of the claws supports the stirrups of the steel cage.

[0023] Select a lifting wire rope to pass through the corresponding hollow sleeve rod. The two ends of the lifting wire rope are respectively connected to the lifting rings on the top and bottom hollow sleeve rods inside the steel cage. The lifting wire rope is also equipped with branch ropes, which are suitable for connecting the lifting rings on the other hollow sleeve rods.

[0024] The lifting wire rope is connected to the hook of the main lifting equipment, and the hook of the auxiliary lifting equipment is hooked to the node of the bottom stirrups and main bars of the steel cage;

[0025] Install a clamp on the top of the steel cage and connect the clamp to the traction rope;

[0026] Step 3: Install the verticality retainer

[0027] Install a verticality retainer at the pile hole opening, adjust the horizontality of the verticality retainer so that it is horizontally positioned at the pile hole opening, and the manual drum and guide wheel assembly are on the diameter line of the pile hole opening;

[0028] Step 4: Adjusting the posture of the rebar cage

[0029] The main hoisting equipment and auxiliary hoisting equipment suspend the steel cage from a horizontal state to a vertical state. The auxiliary hoisting equipment automatically detaches the bottom of the steel cage using the gravity of the hook. The main hoisting equipment moves the steel cage to the pile opening and places it at the top of the pile opening. The traction rope and the corresponding manual drum are connected and wound.

[0030] Step 5: Lower the steel cage vertically

[0031] The main hoisting equipment gradually lowers the steel cage, while the manual drum around the steel cage gradually tightens the traction rope to ensure that the projection of the top of the steel cage on the horizontal plane is always in the center of the pile opening, thus completing the precise vertical lowering of the steel cage.

[0032] Step Six: Lifting Equipment Disengagement

[0033] When the electromagnet is de-energized, the hook of the main hoisting equipment moves downward a short distance. The movable plate loses its attraction towards the connecting plate, and the return spring automatically pushes the sliding sleeve upward. As soon as the hinge rod approaches the return spring, the drive rod swings downward and the connecting rod swings upward. The claw and hook automatically disengage from the stirrups and main bars of the steel cage. Finally, the main hoisting equipment's hook drives the lifting wire rope upward.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] By using the switching on and off of an electromagnet, the movable plate moves closer to and away from the connecting plate. When it approaches the connecting plate, the drive rod and connecting rod move the grab hook and claw outward. During the outward movement, the claw swings left and right relative to the grab hook. After reaching the outermost position, it is connected and fixed to the main bars and stirrups of the reinforcing cage. At this point, multiple lifting main structures are set up along the length of the reinforcing cage. The multiple lifting main structures are arranged in series to ensure that the reinforcing cage will not deform during the attitude adjustment process. After the attitude adjustment, the auxiliary lifting equipment can be connected to the steel cage by the gravity of its own hook. The stirrups and main bars at the bottom of the reinforcing cage automatically detach. After the reinforcing cage, after being adjusted in posture, is moved directly above the pile hole, the top of the reinforcing cage is kept aligned with the pile hole on the horizontal projection plane using a traction rope and a manual drum via a guide wheel assembly. By lowering the main hoisting equipment and simultaneously tightening the traction rope with multiple manual drums, vertical lowering is ensured, preventing the reinforcing cage from contacting the inner wall of the pile hole during lowering, which could cause the pile hole to collapse, easily lead to dimensional deformation of the reinforcing cage, and also cause the reinforcing cage to contact the inner wall of the pile hole, resulting in the collapse of the pile hole and affecting the subsequent forming process and the quality of the pier column. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure construction of the present invention;

[0037] Figure 2 For the present invention Figure 1 A working diagram of the lifting main structure according to one embodiment;

[0038] Figure 3 For the present invention Figure 1 A non-operating-condition diagram of the main lifting structure in one embodiment;

[0039] Figure 4 for Figure 3 Diagram showing the positional relationship between the middle support claw and the gripper hook;

[0040] Figure 5 This is a top view of the lifting main structure of the present invention;

[0041] Figure 6 For the present invention Figure 1 Working condition diagram of the lifting main structure in another implementation method;

[0042] Figure 7 This is a top view of the main lifting structure and auxiliary lifting components of the present invention;

[0043] Figure 8 This is a schematic diagram of the overall structure of the jacket in the auxiliary hoisting assembly of the present invention.

[0044] In the diagram: 1. Connecting plate; 2. Movable plate; 3. Connecting rod; 4. Drive rod; 5. Electromagnet; 6. Hollow sleeve rod; 7. Lifting ring; 8. Socket plate; 9. Sliding sleeve; 10. Return spring; 11. Grab hook; 12. Claw; 13. Folding plate; 14. Limiting pin; 15. Guide groove; 16. Limiting plate; 17. Rod one; 18. Rod two; 19. Verticality retainer; 20. Manual drum; 21. Traction rope; 22. Clamping sleeve; 221. Clamping plate; 222. Connecting piece; 223. Clamping area; 224. Limiting area; 23. Guide wheel assembly. Detailed Implementation

[0045] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0046] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0047] Example 1, as Figures 1 to 5 As shown, a hoisting device for cast-in-place pile reinforcement cages for ultra-deep foundation pit support includes at least two sets of hoisting main structures arranged along the length of the reinforcement cage. The hoisting main structures include connecting components and hoisting components.

[0048] The connecting assembly includes a connecting plate 1 and a movable plate 2. Multiple connecting rods 3 are rotatably mounted on the side of the connecting plate 1, and a gripping assembly is rotatably mounted on the top of the connecting rods 3. A drive rod 4 is rotatably mounted on the side of the movable plate 2, and the drive rod 4 is located on the top of the connecting rods 3. An electromagnet 5 is mounted on the top of the connecting plate 1. The electromagnet 5 is suitable for attracting the movable plate 2 and causing it to move downward relative to the connecting plate 1.

[0049] The lifting assembly includes a connecting claw, which includes a hollow sleeve rod 6. The hollow sleeve rod 6 passes through the movable plate 2 and has a lifting ring 7 at its top. A socket plate 8 is provided at the bottom of the hollow sleeve rod 6. A hinge rod is rotatably mounted on the side of the socket plate 8. A sliding sleeve 9 is installed at the free end of the hinge rod. The sliding sleeve 9 is adapted to abut against the bottom of the movable plate 2. A return spring 10 is fitted on the outer side of the hollow sleeve rod 6 between the sliding sleeve 9 and the socket plate 8. A through hole is provided on the connecting plate 1 for the socket plate 8 to pass through.

[0050] The gripping assembly includes a gripping hook 11 rotatably mounted to the connecting rod 3 and a claw 12 rotatably mounted to the drive rod 4;

[0051] The hook 11 is suitable for connecting the main reinforcement bars of the steel cage. The hook 11 has ear plates on both sides, and the claws 12 are rotatably installed on the two ear plates. The claws 12 are suitable for connecting the stirrups of the steel cage.

[0052] Folding plates 13 are installed on the ear plates on both sides of the hook 11. Limiting pins 14 are installed on both folding plates 13. A guide groove 15 is opened on the bottom side of the claw 12. The guide groove 15 is suitable for the limiting pin 14 to swing left and right relative to the claw 12. The guide groove 15 has an arc-shaped structure.

[0053] The top of the hollow sleeve rod 6 is provided with a limiting plate 16. The limiting plate 16 is located outside the hollow sleeve rod 6 and is adapted to control the hinge point of the hinge rod itself to be in the through hole of the connecting plate 1 when the electromagnet 5 is not energized.

[0054] The hinge rod includes rod 17 and rod 2 18. One free end of rod 17 and rod 2 18 are hinged together. The other free end of rod 17 is hinged to the bottom of the sliding sleeve 9, and the other free end of rod 2 18 is hinged to the side of the socket plate 8.

[0055] By energizing the electromagnet 5, the movable plate 2 moves closer to and further away from the connecting plate 1. When it approaches the connecting plate 1, the drive rod 4 and connecting rod 3 move the hook 11 and the claw 12 outward. During the outward movement, the claw 12 swings outward relative to the hook 11. After reaching the outermost position, it connects and fixes itself to the main reinforcement and stirrups of the steel cage. At this point, multiple lifting main structures are set up along the length of the steel cage, and these multiple lifting main structures are arranged in series to ensure that the steel cage does not deform during the attitude adjustment process. After the hoisting is completed, the electromagnet 5 is de-energized, and the return spring 10 moves the sliding sleeve 9 upward, causing the rod 17 to deflect towards the side closer to the return spring 10. This increases the distance between the connecting plate 1 and the movable plate 2, causing the drive rod 4 to deflect downward and the connecting rod 3 to deflect upward, thereby causing the hook 11 and the claw 12 to automatically disengage from the main reinforcement and stirrups, respectively, thus completing the automatic disengagement action.

[0056] Example 2, based on the above examples, makes the following improvements, such as... Figure 6 As shown, the bottom of the connecting plate 1 is provided with a limiting groove, which is suitable for limiting the position of the hinge rod.

[0057] Example 3, based on the above examples, makes the following improvements, such as... Figure 1 , Figure 7 and Figure 8 As shown, the hoisting device also includes an auxiliary hoisting component. The auxiliary hoisting component includes a verticality retaining frame 19 installed at the pile opening. The verticality retaining frame 19 includes a frame body installed horizontally at the turning opening. Multiple manual drums 20 and guide wheel sets 23 are provided on the frame body. The guide wheel sets 23 and manual drums 20 are positioned correspondingly and are all arranged along the radial direction of the pile opening.

[0058] A traction rope 21 is wound on a manual drum 20. A sleeve 22 is installed at the free end of the traction rope 21. The sleeve 22 is adapted to clamp the top of the steel cage.

[0059] The clamp 22 includes two clamping plates 221. One end of the two clamping plates 221 is connected by a pivot, and the other end of the two clamping plates 221 is fixed by a connector 222. The connector 222 is suitable for fixing the traction rope 21. A clamping area 223 is provided on the opposite side of the clamping plates 221. The clamping area 223 is suitable for clamping and fixing the stirrups of the steel cage. A limiting area 224 is provided on both clamping plates 221. The limiting area 224 is suitable for fixing the main reinforcement of the steel cage.

[0060] After the steel cage is hoisted to the pile opening, the traction rope is gradually tightened by lowering the steel cage using a manual drum 20. The traction rope ensures the verticality of the steel cage during lowering. The sleeve 22 clamps and fixes the stirrups and main bars with its two clamps 221 through the connector 222 (bolts). The traction rope 21 and connector 222 are used to connect and fix the sleeve 22. The removal of the sleeve 22 is carried out after the main hoisting equipment is removed.

[0061] The hoisting process for the reinforcing cage of a cast-in-place pile is as follows:

[0062] Step 1: Preparation

[0063] Two crawler cranes were selected, one as the main lifting equipment and the other as the auxiliary lifting equipment;

[0064] Step 2: Installation of lifting equipment

[0065] Before lifting the reinforcing cage, finite element analysis is performed to determine the deformation location. A lifting device is then installed inside the reinforcing cage along its length, positioned at the deformation location. The installation steps for the lifting device are as follows:

[0066] After placing multiple hoisting devices inside the steel cage, align the position of the hook 11 with the position of the main reinforcement bar of the steel cage, and supply power to the electromagnet 5 so that they are all magnetic. The electromagnet 5 attracts the movable plate 2, and the movable plate 2 gradually approaches the connecting plate 1. The hook 11 and the claw 12 are moved outward through the drive rod 4 and the connecting rod 3, so that the hook 11 and the main reinforcement bar of the steel cage are matched. When the claw 12 moves outward, it will swing relative to the hook 11, so that the top of the claw 12 supports the stirrup of the steel cage.

[0067] Select a lifting wire rope to pass through the corresponding hollow sleeve rod 6. The two ends of the lifting wire rope are respectively connected to the lifting rings 7 on the top hollow sleeve rod 6 and the bottom hollow sleeve rod 6 inside the steel cage. The lifting wire rope is also equipped with branch ropes, which are suitable for connecting the lifting rings 7 on the other hollow sleeve rods 6.

[0068] The lifting wire rope is connected to the hook of the main lifting equipment, and the hook of the auxiliary lifting equipment is hooked to the node of the bottom stirrups and main bars of the steel cage;

[0069] Install a sleeve 22 on the top of the steel cage and connect the sleeve 22 to the traction rope 21;

[0070] Step 3: Installation of verticality retainer 19

[0071] Install a verticality retainer 19 at the pile hole opening, adjust the horizontality of the verticality retainer 19 so that it is horizontally located at the pile hole opening, and the manual drum 20 and guide wheel assembly 23 are on the diameter line of the pile hole opening.

[0072] Step 4: Adjusting the posture of the rebar cage

[0073] The main hoisting equipment and auxiliary hoisting equipment suspend the steel cage from a horizontal state to a vertical state. The auxiliary hoisting equipment automatically detaches the bottom of the steel cage using the gravity of the hook. The main hoisting equipment moves the steel cage to the pile opening and places it at the top of the pile opening. The traction rope 21 and the corresponding manual drum 20 are connected and wound.

[0074] Step 5: Lower the steel cage vertically

[0075] The main hoisting equipment gradually lowers the steel cage, while the manual drum 20 around the steel cage gradually tightens the traction rope 21 to ensure that the projection of the top of the steel cage on the horizontal plane is always in the center of the pile opening, thus completing the precise vertical lowering of the steel cage.

[0076] Step Six: Lifting Equipment Disengagement

[0077] When the electromagnet 5 is de-energized, the hook of the main hoisting equipment moves downward a short distance, the movable plate 2 loses its attraction towards the connecting plate 1, the return spring 10 automatically pushes the sliding sleeve 9 upward, the hinge rod 17 approaches the return spring 10, the drive rod 4 swings downward and the connecting rod 3 swings upward, the claw 12 and the grab hook 11 automatically disengage from the stirrups and main bars of the steel cage, and finally the lifting wire rope is driven upward by the hook of the main hoisting equipment.

[0078] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A hoisting device for cast-in-place pile reinforcement cages used in ultra-deep foundation pit support, characterized in that, It includes at least two sets of lifting main structures arranged along the length of the steel cage, and the lifting main structure includes connecting components and lifting components; The connecting assembly includes a connecting plate (1) and a movable plate (2). Multiple connecting rods (3) are rotatably mounted on the side of the connecting plate (1). A gripping assembly is rotatably mounted on the top of the connecting rods (3). A drive rod (4) is rotatably mounted on the side of the movable plate (2), and the drive rod (4) is located on the top of the connecting rods (3). An electromagnet (5) is mounted on the top of the connecting plate (1). The electromagnet (5) is adapted to attract the movable plate (2) and make it move downward relative to the connecting plate (1). The lifting assembly includes a connecting claw, which includes a hollow sleeve rod (6). The hollow sleeve rod (6) passes through the movable plate (2) and is provided with a lifting ring (7) at the top. A socket plate (8) is provided at the bottom of the hollow sleeve rod (6). A hinge rod is rotatably installed on the side of the socket plate (8). A sliding sleeve (9) is installed at the free end of the hinge rod. The sliding sleeve (9) is adapted to abut against the bottom of the movable plate (2). A return spring (10) is fitted on the outside of the hollow sleeve rod (6) between the sliding sleeve (9) and the socket plate (8). A through hole is provided on the connecting plate (1) for the socket plate (8) to pass through. The gripping assembly includes a gripping hook (11) rotatably mounted to the connecting rod (3) and a claw (12) rotatably mounted to the drive rod (4). The hook (11) is suitable for connecting the main reinforcement bars of the steel cage. Ear plates are provided on both sides of the hook (11), and claws (12) are rotatably installed on the two ear plates. The claws (12) are suitable for connecting the stirrups of the steel cage. Folding plates (13) are installed on the ear plates on both sides of the hook (11). Limiting pins (14) are installed on both folding plates (13). A guide groove (15) is opened on the side of the bottom of the claw (12). The guide groove (15) is suitable for the limiting pin (14) to swing left and right relative to the claw (12). The guide groove (15) has an arc-shaped structure. The top of the hollow sleeve rod (6) is provided with a limiting plate (16). The limiting plate (16) is located outside the hollow sleeve rod (6) and is suitable for controlling the hinge point of the hinge rod itself to be in the through hole of the connecting plate (1) when the electromagnet (5) is not energized. The bottom of the connecting plate (1) is provided with a limiting groove, which is suitable for limiting the position of the hinge rod. The hinge rod includes rod one (17) and rod two (18). One free end of rod one (17) and rod two (18) are hinged together. The other free end of rod one (17) is hinged to the bottom of the sliding sleeve (9), and the other free end of rod two (18) is hinged to the side of the socket plate (8).

2. The hoisting device for cast-in-place pile reinforcement cages for ultra-deep foundation pit support according to claim 1, characterized in that, The hoisting device also includes an auxiliary hoisting component, which includes a verticality retaining frame (19) installed at the pile opening. The verticality retaining frame (19) includes a frame installed horizontally at the turning opening. Multiple manual drums (20) and guide wheel sets (23) are provided on the frame. The guide wheel sets (23) and manual drums (20) are positioned correspondingly and are arranged along the radial direction of the pile opening. A traction rope (21) is wound around a manual drum (20). A sleeve (22) is installed at the free end of the traction rope (21). The sleeve (22) is adapted to be clamped to the top of the steel cage.

3. The hoisting device for cast-in-place pile reinforcement cages for ultra-deep foundation pit support according to claim 2, characterized in that, The clamp (22) includes two clamps (221). One end of the two clamps (221) is connected by a pivot, and the other end of the two clamps (221) is fixed by a connector (222). The connector (222) is suitable for fixing the traction rope (21). A clamping area (223) is provided on the opposite side of the clamps (221). The clamping area (223) is suitable for clamping and fixing the stirrups of the steel cage. A limiting area (224) is provided on both clamps (221). The limiting area (224) is suitable for fixing the main reinforcement of the steel cage.

4. A steel cage hoisting process for a cast-in-place pile steel cage hoisting device according to claim 3, characterized in that, The hoisting steps are as follows: Step 1: Preparation Two crawler cranes were selected, one as the main lifting equipment and the other as the auxiliary lifting equipment; Step 2: Installation of lifting equipment Before lifting the reinforcing cage, finite element analysis is performed to determine the deformation location. A lifting device is then installed inside the reinforcing cage along its length, positioned at the deformation location. The installation steps for the lifting device are as follows: After placing multiple hoisting devices inside the steel cage, the positions of the hooks (11) and the main reinforcement bars of the steel cage are aligned. Power is supplied to the electromagnets (5) so that they are all magnetic. The electromagnets (5) attract the movable plate (2). The movable plate (2) gradually approaches the connecting plate (1). The hooks (11) and the claws (12) are moved outward through the drive rod (4) and the connecting rod (3), so that the hooks (11) and the main reinforcement bars of the steel cage are matched. When the claws (12) move outward, they will swing relative to the hooks (11), so that the top of the claws (12) supports the stirrups of the steel cage. Select a lifting wire rope to pass through the corresponding hollow sleeve (6). The two ends of the lifting wire rope are connected to the lifting rings (7) on the top hollow sleeve (6) and the bottom hollow sleeve (6) in the steel cage, respectively. The lifting wire rope is also provided with a branch rope, which is suitable for connecting the lifting rings (7) on the other hollow sleeves (6). The lifting wire rope is connected to the hook of the main lifting equipment, and the hook of the auxiliary lifting equipment is hooked to the node of the bottom stirrups and main bars of the steel cage; Install a sleeve (22) on the top of the steel cage and connect the sleeve (22) and the traction rope (21); Step 3: Installation of verticality retainer (19) Install a verticality retainer (19) at the pile hole opening, adjust the horizontality of the verticality retainer (19) so that it is horizontal at the pile hole opening, and the manual drum (20) and guide wheel assembly (23) are on the diameter line of the pile hole opening; Step 4: Adjusting the posture of the rebar cage The steel cage is suspended from a horizontal state to a vertical state by the main hoisting equipment and the auxiliary hoisting equipment. The auxiliary hoisting equipment automatically completes the detachment of the bottom of the steel cage by the gravity of the hook. The main hoisting equipment moves the steel cage to the pile hole and places it at the top of the pile hole. The traction rope (21) and the corresponding manual drum (20) are connected and wound. Step 5: Lower the steel cage vertically The steel cage is lowered gradually by the main hoisting equipment, and the traction rope (21) is gradually tightened by the manual drum (20) around the steel cage to ensure that the projection of the top of the steel cage on the horizontal plane is always in the center of the pile hole, thus completing the precise vertical lowering of the steel cage. Step Six: Lifting Equipment Disengagement When the electromagnet (5) is de-energized, the hook of the main hoisting equipment moves downward a short distance, the movable plate (2) loses its attraction towards the connecting plate (1), the return spring (10) automatically pushes the sliding sleeve (9) upward, the first member (17) of the hinge rod approaches the return spring (10), the drive rod (4) swings downward, the connecting rod (3) swings upward, the claw (12) and the hook (11) automatically disengage from the stirrups and main bars of the steel cage, and finally the hoisting wire rope is driven upward by the hook of the main hoisting equipment.

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