Pile foundation waste reinforcement cage extraction device and construction method

Abstract

The application discloses a pile foundation abandoned steel reinforcement cage taking-out device and a construction method, and relates to the technical field of building construction equipment. The pile foundation abandoned steel reinforcement cage taking-out device comprises a salvager, and the salvager comprises a connecting cylinder, a plug-in column and clamping claws. The connecting cylinder is fixedly installed at one end of the plug-in column, the end of the plug-in column away from the connecting cylinder is provided with a plug-in tip, and the clamping claws are provided with two and are respectively installed at the left and right sides of the plug-in tip. The two clamping claws are located at the same height. The connecting cylinder is provided with an installation inner cavity, and the sidewall of the connecting cylinder is provided with a connecting lock column. The application has the advantages of simple structure, reliable function, convenient insertion of the salvager into the steel reinforcement cage and clamping connection with the steel reinforcement cage, thereby being used for the taking-out operation of the steel reinforcement cage, and solving the problem that the steel reinforcement cage in the pile hole is difficult to handle when the installation is not in conformity with the regulations. The tip of the clamping claw can be outwardly opened, so that the salvager and the steel reinforcement cage can be conveniently and stably clamped, the problem that the steel reinforcement cage is dropped due to loose clamping and thus repeated operation is required is avoided, the working hours are reduced, and the efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of construction equipment technology, specifically to a device and construction method for removing abandoned steel cages from pile foundations. Background Technology

[0002] Before the concrete is poured for the pile foundation, the pile reinforcement cage must be lowered into the pile hole. During construction, due to reasons such as substandard quality of the reinforcement cage itself, non-standard operation by construction personnel, and hole collapse, problems such as the reinforcement cage tilting, falling off and being buried often occur. In particular, problems such as tilting, falling off and being buried after the reinforcement cage has been installed in place are especially difficult to deal with.

[0003] In traditional techniques, most construction companies fill the borehole with soil and then use an impact drill to directly dismantle the reinforcing cage. During this process, stones are often thrown in. Because reinforcing steel is heavy, the broken steel ends cannot be suspended in the mud and discharged from the borehole, requiring suction dredging. This method is costly, time-consuming, and results in significant losses. Summary of the Invention

[0004] In order to overcome the problem of "difficulty in handling the steel cage in the pile hole when it is not installed in accordance with regulations" in the above-mentioned background technology, the present invention provides a device and construction method for removing abandoned steel cages in pile foundations.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A device for removing abandoned steel reinforcement cages from pile foundations includes a retrieval tool, which comprises a connecting cylinder, a plug-in column, and locking claws. The connecting cylinder is fixedly installed at one end of the plug-in column, and the end of the plug-in column away from the connecting cylinder is provided with a plug-in tip. Two locking claws are provided and are respectively installed on the left and right sides of the plug-in tip. The two locking claws are at the same height. The connecting cylinder is provided with an installation cavity, and a connecting locking column is provided on the side wall of the connecting cylinder.

[0007] As a further optimization of the present invention, the locking claw is fixedly connected to the insertion tip; the two locking claws are arranged in an inverted V-shape.

[0008] As a further optimization of the present invention, connecting fins are respectively provided on the left and right side walls of the insertion tip, and the locking claw is rotatably connected to the connecting fins through a rotating shaft.

[0009] As a further optimization of the present invention, a torsion spring is sleeved on the outer periphery of the rotating shaft, and the two ends of the torsion spring are respectively connected to the locking claw and the insertion tip, so that the locking claw has a tendency to rotate.

[0010] As a further optimization of the present invention, an abutment block is fixedly installed at the lower end of the connecting fin, and the upper surface of the abutment block is provided with a limiting surface for supporting the locking claw; the limiting surface can support the outer side wall of the locking claw on the same side as it near the rotating shaft.

[0011] As a further optimization of the present invention, the plug post is provided with a mounting cavity with openings on both sides, and the inner edge of the connecting fin is fixedly connected to the opening sidewall of the mounting cavity.

[0012] As a further optimization of the present invention, the two locking claws are arranged in an inverted V-shape.

[0013] As a further optimization of the present invention, the plug post is provided with a receiving cavity with openings on both sides, and the two locking claws are arranged in an X-shape within the receiving cavity; a driving component for pushing the two locking claws to the cross position is provided at the top of the receiving cavity.

[0014] As a further optimization of the present invention, a support ring is sleeved on the surface of the rotating shaft, and the two end faces of the support ring are respectively pressed against the inner wall of the mounting cavity and the locking claw; one support ring is located in front of one locking claw and the other support ring is located behind another locking claw, so that the two locking claws are in a front-to-back position; the locking claw is provided with a support protrusion, and the support protrusion is provided with a first pressing surface and a second pressing surface, the first pressing surface is used to adapt to press against the limiting surface on the opposite side, and the second pressing surface is used to adapt to press against the support ring on the opposite side.

[0015] A construction method for a device for removing abandoned steel reinforcement cages from pile foundations includes the following steps: S1, drilling a hole using a drill bit with the same diameter as the pile hole to twist and compress the steel reinforcement cage until it is compressed into a long elastic body; S2, installing the retrieval device on the drill rod of a rotary drilling rig; S3, starting the rotary drilling rig and driving the drill rod to extend downward along the pile hole, inserting the bottom end of the insertion post into the compressed steel reinforcement cage; S4, starting the rotary drilling rig and driving the drill rod to retract upward, and the clamping claws hooking the compressed steel reinforcement cage out of the pile hole.

[0016] In summary, the advantages of this invention are:

[0017] (1) The present invention has a simple structure and reliable function. The retrieval device can be conveniently inserted into the steel cage and snapped into the steel cage, thereby being used for the removal of the steel cage, solving the problem of the difficulty in handling the inclined steel cage in the pile hole.

[0018] (2) The torsion spring can push the tip of the clamping claw of the retrieval device to open outward, so that the retrieval device and the rebar cage can be clamped together conveniently and stably, avoiding the problem of the rebar cage falling due to loose clamping and thus requiring repeated work, reducing working hours and improving efficiency.

[0019] (3) The drive component can push the tip of the snap-fit ​​claw to open outward, thereby avoiding the problem that the snap-fit ​​claw cannot open due to the messy steel bars in the steel cage, further improving the hooking hit rate and improving construction efficiency. Attached Figure Description

[0020] The present application will be further explained below with reference to the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the fixed connection structure between the locking claw and the insertion tip;

[0023] Figure 3 This is a schematic diagram showing the installation location and structure of the connecting fins;

[0024] Figure 4 This is a schematic diagram showing the installation location and structure of the abutment block;

[0025] Figure 5 This is a schematic diagram showing the installation location and structure of the limiting surface;

[0026] Figure 6 This is a schematic diagram showing the installation location and structure of the extension block;

[0027] Figure 7 A schematic diagram showing the structure of two intersecting card claws;

[0028] Figure 8 A top-view cross-section of the mounting structure of the card claw a;

[0029] Figure 9 A top-view cross-section of the mounting structure of the card claw b;

[0030] Figure 10 A top view of the clamping claws a and b in the state of being pressed against the support ring;

[0031] Figure 11 This is a schematic diagram showing the position of the support protrusion when the locking claws are in the crossed state.

[0032] Figure 12 A schematic diagram showing the location and structure of the supporting protrusion;

[0033] Figure 13 A schematic diagram showing the press-fitting state between the support protrusion, the limiting surface, and the support ring;

[0034] Figure 14 This is a schematic diagram showing the location and structure of the upward-curving tip.

[0035] Explanation of reference numerals in the attached figures:

[0036] In the picture,

[0037] 1. Connecting cylinder; 11. Connecting lock pin; 12. Reinforcing rib;

[0038] 2. Insertion post; 201. Mounting cavity; 202. Receiving cavity; 21. Insertion tip; 22. Connecting fin; 221. Abutment block; 2211. Limiting surface; 2212. Extension block;

[0039] 3. Claw; 31. Support protrusion; 311. First pressing surface; 312. Second pressing surface; 32. Upward-curving tip;

[0040] 4. Shaft;

[0041] 5. Support ring;

[0042] 6. Driver components;

[0043] 3a. Connecting claw a; 3b. Connecting claw b;

[0044] 4a. Shaft a; 4b. Shaft b;

[0045] 5a, Support ring a; 5b, Support ring b. Detailed Implementation

[0046] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows:

[0047] Example 1, refer to Figure 1 A device for removing abandoned steel reinforcement cages from pile foundations includes a retrieval tool, which comprises a connecting cylinder 1, a plug-in post 2, and locking claws 3. The connecting cylinder 1 is fixedly installed at one end of the plug-in post 2 (e.g., through an integral fixed connection or through bolt fixing). The end of the plug-in post 2 away from the connecting cylinder 1 has a plug tip 21. Two locking claws 3 are provided and respectively installed on the left and right sides of the plug tip 21. The two locking claws 3 are at the same height. The connecting cylinder 1 has an inner cavity for installation, and a connecting locking post 11 is provided on the side wall of the connecting cylinder 1. The connecting locking post 11 is inserted into a screw hole on the side wall of the connecting cylinder 1 and screwed in. In use, the connecting cylinder 1 is sleeved on the drill rod of a rotary drilling rig, and then the connecting locking post 11 is rotated until the end of the connecting locking post 11 is inserted into the positioning hole of the drill rod, thereby realizing the connection between the retrieval tool and the drill rod.

[0048] Reference Figure 2 The top of the plug-in post 2 is fixedly connected to the middle of the bottom plate of the connecting cylinder, and a reinforcing rib 12 is provided at the connection position.

[0049] Example 2, based on Example 1, refers to the method used in the pile foundation waste steel cage removal device. Figure 2The locking claw 3 is fixedly connected to the insertion tip 21; the two locking claws 3 are arranged in an inverted V-shape, making it easy to insert the locking claw 3 into the reinforcing cage and difficult to pull it out of the reinforcing cage. In this embodiment, the locking claw 3 is fixedly connected to the insertion tip 21 (for example, by bolts or by an integral fixed connection), thereby giving the retrieval device higher structural strength.

[0050] Example 3, based on Example 1, refers to the method used in the pile foundation waste reinforcement cage removal device. Figure 3 and Figure 4 The left and right sides of the insertion tip 21 are respectively provided with connecting fins 22 (e.g., fixed by bolts or integral fixed connection). The locking claw 3 is rotatably connected to the connecting fins 22 via a rotating shaft 4. Two parallel connecting fins 22 are provided on each of the left and right sides of the insertion tip 21. The locking claw 3 is positioned between the two connecting fins 22 on the same side. Both ends of the rotating shaft 4 are fixedly connected to the two connecting fins 22 on the same side (e.g., fixed by cold shrinkage, integral fixed connection, bolt fixed connection, welding fixed connection, etc.), making the rotating shaft 4 horizontal. A torsion spring is fitted around the outer circumference of the rotating shaft 4. Both ends of the torsion spring are connected to the locking claw 3 and the insertion tip 21, respectively. The torsion spring applies a rotational force to the locking claw 3, causing the locking claw 3 to rotate. During the insertion of the bottom end of the plug-in post 2 into the compressed steel cage, the clamping claw 3 rotates inward (under the compression of the steel cage), thereby improving the smoothness of insertion; after the bottom end of the plug-in post 2 is inserted into the compressed steel cage, the tip of the clamping claw 3 opens outward (driven by the torsion spring) (see reference). Figure 4 (The left clamping claw 3 rotates counterclockwise and the right clamping claw 3 rotates clockwise), so that during the upward movement of the plug-in column 2, the clamping claw 3 can clamp the steel cage and lift the steel cage.

[0051] Reference Figure 4 and Figure 5 A contact block 221 is fixedly installed at the lower end of the connecting fin 22 (e.g., by bolt or by an integral connection). The upper surface of the contact block 221 is provided with a limiting surface 2211 for supporting the snap-fit ​​claw 3. The limiting surface 2211 can support the outer wall of the snap-fit ​​claw 3 on the same side as it near the rotating shaft 4. The snap-fit ​​claw 3 opens outward until the limiting surface 2211 and the outer wall of the snap-fit ​​claw 3 near the rotating shaft 4 are pressed together. The limiting surface 2211 is used to prevent the limiting surface 2211 from continuing to rotate and to transmit the lifting force to the reinforcing cage through the snap-fit ​​claw 3.

[0052] Reference Figure 6An extension block 2212 is provided below the abutment block 221. The top end of the extension block 2212 is fixedly connected to the abutment block 221 (e.g., by bolts or by an integral connection), the side wall is fixedly connected to the insertion post 2 (e.g., by bolts or by an integral connection), and the bottom end is fixedly connected to the insertion post 2 (e.g., by bolts or by an integral connection). The extension block 2212 serves to connect the abutment block 221 and the insertion post 2, preventing the abutment block 221 from being suspended, thereby improving the load-bearing capacity of the abutment block 221 and further enhancing the structural strength of the retrieval device. The outer wall of the extension block 2212 is aligned with the outer wall of the insertion post 2. The connection position between the extension block 2212 and the abutment block 221 has a rounded corner structure, and the lower edge of the outer wall of the abutment block 221 also has a rounded corner structure, thereby improving the smoothness of the retrieval device's insertion into the reinforcing cage.

[0053] Reference Figure 4 and Figure 6 The insertion post 2 is provided with an installation cavity 201 with openings on both sides. The inner edge of the connecting fin 22 is fixedly connected to the side wall of the opening of the installation cavity 201 (for example, by bolt fixing or by integral fixing). This makes the distance between the two rotating shafts 4 as close as possible, so that the clamping claw 3 has the smallest possible cross-sectional area in the convergent state, further improving the smoothness of the retrieval device inserting into the rebar cage.

[0054] Reference Figure 4 and Figure 6 The two locking claws 3 are arranged in an inverted V-shape, making it easy to insert the locking claws 3 into the reinforcing cage and difficult to pull them out. After the reinforcing cage is removed, the retrieval device can be taken out by cutting or prying the reinforcing cage.

[0055] Example 4, based on Example 3, refers to the method used in the pile foundation waste steel cage removal device. Figure 7 The insertion post 2 has a receiving cavity 202 with openings on both sides. The receiving cavity 202 is located above and communicates with the mounting cavity 201. Two locking claws 3 are arranged in an X-shape within the receiving cavity 202. A driving component 6 is provided at the top of the receiving cavity 202 to push the two locking claws 3 to their intersecting position. The driving component 6 pushes the intersecting position of the two locking claws 3 downward, causing the upper end of the locking claws 3 to extend out of the receiving hole of the insertion post 2. Compared with the scheme in Embodiment 3 where the locking claws 3 are simply driven to open outward by a torsion spring, this has a more reliable driving method because the compressed steel cage contains interlaced steel bars, which often block the tip of the locking claws 3, making it impossible to push the locking claws 3 open by relying solely on the torsion spring, and thus making it difficult to lock the steel cage. (Refer to...) Figure 7The locking claw 3 on the side is locking claw a3a, and the locking claw 3 on the left side is locking claw b3b. Under the action of the torsion spring, locking claw a3a tends to rotate clockwise, and locking claw b3b tends to rotate counterclockwise, so that both locking claws 3 can keep in contact with the drive component 6, thereby preventing the locking claws 3 from opening accidentally and ensuring that the locking claws 3 can be smoothly inserted into the rebar cage. When the drive component 6 extends downward, it can push locking claw a3a to rotate counterclockwise and locking claw b3b to rotate clockwise, so that the tips of the two locking claws 3 extend out of the receiving cavity 202 and lock with the rebar cage.

[0056] Reference Figures 8-10 A support ring 5 is fitted onto the surface of the rotating shaft 4. The two end faces of the support ring 5 are respectively pressed against the inner wall of the mounting cavity 201 and the locking claw 3. One support ring 5 is located in front of one locking claw 3, and the other support ring 5 is located behind the other locking claw 3, so that the two locking claws 3 are positioned one in front of the other, thereby achieving stable installation of the two locking claws 3. (Refer to...) Figures 7-10 The rotating shaft 4 connected to the right-side locking claw a3a is a rotating shaft a4a, and the support ring 5 sleeved on the surface of the rotating shaft a4a is a support ring a5a. The support ring a5a is located at the rear side of the locking claw 3. The rotating shaft 4 connected to the left-side locking claw b3b is a rotating shaft b4b, and the support ring 5 sleeved on the surface of the rotating shaft b4b is a support ring b5b. The support ring b5b is located at the front side of the locking claw 3. The thickness of the locking claw a3a, the thickness of the locking claw b3b, the axial length of the support ring a5a, and the axial length of the support ring b5b are all equal. Therefore, the support ring a5a is supported between the locking claw a3a and the insertion post 2 to form a first receiving space for accommodating the locking claw b3b, and the support ring b5b is supported between the locking claw b3b and the insertion post 2 to form a second receiving space for accommodating the locking claw a3a, thus achieving staggered arrangement to avoid jamming.

[0057] Reference Figures 11-13 The locking claw 3 has a supporting protrusion 31, which is fixedly connected to the locking claw 3 (e.g., through an integral fixed connection or through bolts). The supporting protrusion 31 has a first pressing surface 311 and a second pressing surface 312. The first pressing surface 311 is used to adapt to pressing against the limiting surface 2211 on the opposite side, and the second pressing surface 312 is used to adapt to pressing against the support ring 5 on the opposite side. (Refer to...) Figure 10 and Figure 13 The support protrusion 31 connected to the locking claw a3a presses against the support ring b5b and the left limiting surface 2211; similarly, the support protrusion 31 connected to the locking claw b3b presses against the support ring a5a and the right limiting surface 2211, thereby limiting the two locking claws 3 and preventing the locking claws 3 from rotating excessively and causing the locking with the steel cage to fail.

[0058] Reference Figure 12 and Figure 14The support protrusion 31 is located at the lower edge of the clamping claw 3. The tip of the clamping claw 3 is provided with an upward-curved tip 32. The upward-curved tip 32 is inclined in the direction away from the location of the support protrusion 31, so that after the support protrusion 31 is pressed onto the support ring 5, the upward-curved tip 32 can point diagonally upward, thereby improving the clamping stability of the steel cage, reducing the risk of the steel cage falling off, further avoiding repeated construction caused by the steel cage falling off, and improving work efficiency.

[0059] Reference Figure 14 Since the two rotating shafts 4 are of equal height, the clamping claws 3 can be placed horizontally after being pressed onto the rotating shafts 4. This allows the two upturned tips 32 to have the largest possible distance, thereby improving the clamping stability of the reinforcing cage.

[0060] Reference Figure 7 The drive assembly 6 includes a hydraulic cylinder installed inside the insertion post 2 and two rollers mounted on the output shaft of the hydraulic cylinder. The two rollers can rotate freely 360 degrees and are positioned one in front of the other to press against the arc-shaped surfaces of the two clamping claws 3. The hydraulic cylinder drives the rollers downwards, pushing the tips of the clamping claws 3 outwards. The hydraulic cylinder is located inside the insertion post 2 along its axial direction. The hydraulic cylinder is connected to an external oil pump via an oil pipe. The rotary drilling rig's drill rod is pressed down in a reciprocating rotation (e.g., rotating 180 degrees clockwise, then 180 degrees counterclockwise, and so on) to prevent the oil pipe from tangling during the retrieval device's rotation. Since the external oil pump is located outside the pile hole, the user can control the opening and closing of the clamping claws 3 by controlling the pump's start and stop.

[0061] Example 5, regarding the construction method of the pile foundation waste steel cage removal device in Example 1, the steps include: S1, drilling a hole with the same diameter as the pile hole to twist and compress the steel cage until it is compressed into a long elastic body; S2, installing the retrieval device on the drill rod of the rotary drilling rig; S3, starting the rotary drilling rig and driving the drill rod to extend downward along the pile hole, inserting the bottom end of the plug-in column 2 into the compressed steel cage; S4, starting the rotary drilling rig and driving the drill rod to retract upward, the clamping claw 3 hooking the compressed steel cage out of the pile hole.

[0062] Example 6, regarding the construction method of the pile foundation waste rebar cage removal device in Example 2, the steps include: S1, drilling a hole using a drill bit with the same diameter as the pile hole to twist and compress the rebar cage until it is compressed into a long elastic body; S2, installing the retrieval device on the drill rod of the rotary drilling rig; S3, starting the rotary drilling rig and driving the drill rod to extend downward along the pile hole, inserting the bottom end of the insertion post 2 into the compressed rebar cage; during the insertion of the bottom end of the insertion post 2, the clamping claw 3 applies an expansion force to the rebar cage; after the clamping claw 3 is inserted, the rebar in the rebar cage springs back, causing the insertion hole formed by the insertion post 2 to shrink, thus achieving the clamping of the clamping claw 3 with the rebar cage; S4, starting the rotary drilling rig and driving the drill rod to retract upward, the clamping claw 3 hooks the compressed rebar cage out of the pile hole.

[0063] Example 7, regarding the construction method of the pile foundation waste steel cage removal device in Example 3, the steps include: S1, drilling a hole using a drill bit with the same diameter as the pile hole to twist and compress the steel cage until it is compressed into a long elastic body; S2, installing the retrieval device on the drill rod of the rotary drilling rig; S3, starting the rotary drilling rig and driving the drill rod to extend downward along the pile hole, inserting the bottom end of the plug-in column 2 into the compressed steel cage; after the clamping claw 3 is inserted, the torsion spring drives the tip of the clamping claw 3 to open outward, realizing the clamping claw 3 and the steel cage clamping; S4, starting the rotary drilling rig and driving the drill rod to retract upward, the clamping claw 3 hooks the compressed steel cage out of the pile hole.

[0064] Example 8, regarding the construction method of the pile foundation waste rebar cage removal device in Example 4, the steps include: S1, drilling a hole with the same diameter as the pile hole to twist and compress the rebar cage until it is compressed into a long elastic body; S2, installing the retrieval device on the drill rod of the rotary drilling rig; S3, starting the rotary drilling rig and driving the drill rod to extend downward along the pile hole, inserting the bottom end of the plug 2 into the compressed rebar cage; after the clamping claw 3 is inserted, the driving component 6 pushes the tip of the clamping claw 3 to open outward, realizing the clamping claw 3 and the rebar cage clamping; after being hooked up, under the weight of the rebar cage, the clamping claw 3 has a tendency to continue to rotate outward until the support protrusion 31 presses against the limiting surface 2211 and the support ring 5, then the clamping claw 3 stops rotating, avoiding excessive overturning of the clamping claw 3 and ensuring that the retrieval device and the rebar cage will not separate; S4, starting the rotary drilling rig and driving the drill rod to retract upward, the clamping claw 3 hooks the compressed rebar cage out of the pile hole.

[0065] This invention features a simple structure and reliable function. The retrieval device can be easily inserted into and engaged with the rebar cage for easy removal, solving the problem of difficult handling when the rebar cage is improperly installed in the pile hole. A torsion spring pushes the tip of the retrieval device's engaging claw 3 outwards, ensuring a convenient and stable engagement between the retrieval device and the rebar cage. This prevents the cage from falling due to loose engagement, reducing working hours and improving efficiency. The drive assembly 6 pushes the tip of the engaging claw 3 outwards, preventing the claw from failing to open due to tangled rebar inside the cage, further improving the hook-and-grab accuracy and construction efficiency.

[0066] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," 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.

[0067] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In conclusion, for those skilled in the art, any changes, modifications, substitutions, or variations made to this invention based on the guidance of this invention, without departing from the principles and spirit of this invention, still fall within the protection scope of this invention.

Claims

1. A device for removing discarded steel reinforcement cages from pile foundations, characterized in that: The retrieval device includes a connecting cylinder (1), a plug-in post (2), and a locking claw (3). The connecting cylinder (1) is fixedly installed at one end of the plug-in post (2). The plug-in post (2) is provided with a plug tip (21) at the end away from the connecting cylinder (1). There are two locking claws (3) and they are respectively installed on the left and right sides of the plug tip (21). The two locking claws (3) are at the same height. The connecting cylinder (1) is provided with an installation cavity, and the side wall of the connecting cylinder (1) is provided with a connecting lock pin (11). The left and right sides of the insertion tip (21) are respectively provided with connecting fins (22), one end of the locking claw (3) is rotatably connected to the connecting fins (22) through a rotating shaft (4), and the other end is provided with an upturned tip (32); a torsion spring is sleeved on the outer periphery of the rotating shaft (4); The lower end of the connecting fin (22) is fixedly installed with an abutment block (221), and the upper surface of the abutment block (221) is provided with a limiting surface (2211) for supporting the locking claw (3). The plug post (2) is provided with a receiving cavity (202) with openings on both sides. The two locking claws (3) are arranged in an X-shape in the receiving cavity (202). A driving component (6) is provided at the top of the receiving cavity (202). The driving component (6) can push the two locking claws (3) to the cross position to drive the locking claws (3) to open. A support ring (5) is sleeved on the surface of the rotating shaft (4); The locking claw (3) is provided with a support protrusion (31), the support protrusion (31) is provided with a first pressing surface (311) and a second pressing surface (312), the first pressing surface (311) is used to adapt to press the limiting surface (2211) on the opposite side, and the second pressing surface (312) is used to adapt to press the support ring (5) on the opposite side.

2. The device for removing abandoned steel reinforcement cages from pile foundations according to claim 1, characterized in that: The two ends of the torsion spring are respectively connected to the locking claw (3) and the insertion tip (21), so that the locking claw (3) has a tendency to rotate; The drive assembly (6) includes a hydraulic cylinder installed in the plug post (2) and two rollers installed on the output shaft of the hydraulic cylinder. The two rollers are arranged one in front of the other to press against the arc-shaped surfaces of the two locking claws (3). The hydraulic cylinder drives the rollers to move downward, which can push the tips of the locking claws (3) to open outward.

3. The device for removing abandoned steel reinforcement cages from pile foundations according to claim 2, characterized in that: The plug post (2) is provided with a mounting cavity (201) with openings on both sides, and the inner edge of the connecting fin (22) is fixedly connected to the side wall of the opening of the mounting cavity (201).

4. The device for removing abandoned steel reinforcement cages from pile foundations according to claim 3, characterized in that: The two ends of the support ring (5) are pressed against the inner wall of the mounting cavity (201) and the snap-fit ​​claw (3), respectively; one support ring (5) is located in front of one snap-fit ​​claw (3) and the other support ring (5) is located behind the other snap-fit ​​claw (3), so that the two snap-fit ​​claws (3) are in a front-back position.

5. A construction method for a pile foundation waste steel cage removal device according to any one of claims 1-4, characterized in that the steps are as follows: include: S1. Drill holes using a drill bit of the same diameter as the pile hole to twist and compress the reinforcing cage until it is compressed into a long elastic body. S2. Install the retrieval device on the drill rod of the rotary drilling rig; S3. Start the rotary drilling rig and drive the drill rod to extend downward along the pile hole, inserting the bottom end of the plug-in column (2) into the compressed steel cage; S4. Start the rotary drilling rig and drive the drill rod to retract upwards. The clamping claw (3) will hook the compressed steel cage out of the pile hole.

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