Anchor rod pile reinforcement cage and construction method of anchor rod pile

Abstract

The invention discloses an anchor rod pile reinforcement cage. The anchor rod pile reinforcement cage comprises a cylindrical reinforcement cage body and anchor rods. A plurality of radiation ribs are arranged around the cylindrical reinforcement cage, the radiation ribs are hinged to the cylindrical reinforcement cage, each radiation rib comprises an expansion rib and a driving rod, the driving rods extend into the cylindrical reinforcement cage, and the expansion ribs are located outside the cylindrical reinforcement cage; the upper end plate is fixedly installed on the anchor rod, the plug pin is movably inserted in the upper end plate, the driving plate is located in the cylindrical reinforcement cage and movably arranged on the anchor rod in a sleeving mode, the elastic piece is arranged between the upper end plate and the driving plate, and the driving plate is hung on the upper end plate through the limiting rope. The driving plate can drive the radiation ribs to rotate outwards through the elastic pieces. The invention further discloses a construction method of the anchor rod pile. The radiation ribs are of a fixed structure, the diameter of the expanded-head reinforcement cage is changed in a rotating mode, the mode that the diameter is changed through elastic deformation in an existing structure is changed, and the problem caused by plastic deformation of an existing elastic rib is avoided.

Description

Technical Field

[0001] The invention relates to an anchor pile reinforcement cage and an anchor pile construction method. Background Art

[0002] An anchor pile refers to a pile body that uses the reaction force provided by the anchor bolt anchored in the original foundation. In order to improve the friction of the anchor pile, in the prior art, an enlarged head with a steel cage has been set at the bottom of the anchor pile to increase the friction between the anchor pile and the underground soil, and to improve the pull-out resistance of the anchor pile. At present, the enlarged head steel cage generally uses a steel cage with elastic tendons. Before sinking, the elastic tendons are first bound. After the enlarged head steel cage is sunk into the enlarged head cavity of the pile hole, the binding of the elastic tendons is canceled, so that the elastic tendons are restored to their original state by elasticity. However, in actual use, it is found that in order to facilitate transportation and storage, after the steel cage is made, the elastic tendons sometimes need to be in a bound state for a long time, causing the elastic tendons to undergo plastic deformation. After the binding is canceled, some elastic tendons of the enlarged head steel cage cannot be restored to the preset state, resulting in a reduction in the diameter change range of the enlarged head steel cage, affecting the quality of the enlarged head. Summary of the invention

[0003] In order to solve the problem in the prior art that, due to excessively long periods of restraint, the elastic tendons of the enlarged head steel cage undergo plastic deformation, resulting in a reduction in the radius of the enlarged head steel cage, thus affecting the quality of the enlarged head, the present application first proposes an anchor pile steel cage, which includes an enlarged head steel cage and an anchor rod; the enlarged head steel cage has a cylindrical steel cage composed of interconnected longitudinal tendons and stirrups, the central axis of the cylindrical steel cage extends in a vertical direction, a plurality of radial tendons are arranged around the cylindrical steel cage, each radial tendon includes an expansion tendon and a driving rod, one end of the expansion tendon is connected to one end of the driving rod via a hinged portion, the expansion tendon and the driving rod are arranged in an L shape, a hinged hole is provided on the hinged portion, and the radial tendon is hinged to the cylindrical steel cage via the hinged hole; in a free state, the radial tendon is in a first position;

[0004] The driving rod extends into the inner cavity of the cylindrical steel cage, and the expansion ribs are located outside the cylindrical steel cage; an upper end plate is fixedly installed on the anchor rod, and a latch is movably inserted on the upper end plate; a driving plate is movably sleeved on the anchor rod, and the driving plate is located in the cylindrical steel cage and between the upper end plate and the driving rod, and an elastic member is arranged between the upper end plate and the driving plate, and the two ends of the elastic member are respectively connected to the upper end plate and the driving plate; one end of the limiting rope is fixed on the driving plate, and the other end of the limiting rope can be sleeved on the latch;

[0005] When the limit rope sleeve is arranged on the latch, the elastic member is in a compressed state, so that the radiating rib can be in the first position; when the latch is pulled out, the limit rope is separated from the latch, eliminating the restriction on the elastic member, and the elastic member can rebound and push the driving plate to move downward, and the pushing plate can push the end of the driving rod away from the hinged part to move downward, so that the radiating rib rotates and reaches the second position;

[0006] When the radiating ribs are in the first position, the expansion ribs extend downward, the driving rod is in a horizontal state, and the anchor pile reinforcement cage can be freely placed in the pile hole using the anchor pile reinforcement cage; when the radiating ribs are in the second position, the lower end of the expansion ribs is inclined downward and extends away from the cylindrical reinforcement cage, and the distance from the lower end of the expansion ribs to the central axis of the cylindrical reinforcement cage is 2-4 times the radius of the cylindrical reinforcement cage.

[0007] The main structure of the anchor pile reinforcement cage is based on the cylindrical reinforcement cage. Radial bars are added to the cylindrical reinforcement cage to form an enlarged head reinforcement cage. The cylindrical reinforcement cage can be made using existing mature technology without adding new processing equipment to reduce processing costs. The extended bars of the radial bars are used to enlarge the head reinforcement cage to change the diameter. When used as the reinforcement structure of the anchor pile, it can fully and evenly contact the concrete of the pile body, so that the pull-out pile made can withstand greater pull-out force.

[0008] Since the radial ribs in the present application are a fixed structure, they use rotation to change the diameter of the enlarged head steel cage, which changes the existing structure that uses elastic deformation to change the diameter. Since the radial ribs are a fixed structure, they do not use elastic deformation to change their shape, which avoids the problem of the prior art that when using elastic deformation, plastic deformation occurs due to long-term restraint, which reduces the diameter change range of the enlarged head steel cage.

[0009] Specifically, in order to maximize the expansion ratio of the expanded head steel cage, when the expansion ribs are in the first position, the driving rod is in a horizontal state, the radiating ribs extend downward in the vertical direction or tilt downward and extend away from the cylindrical steel cage, and the angle between the radiating ribs and the vertical direction is 0-5°.

[0010] Furthermore, the cylindrical steel cage has an annular hinged axial rib, which is connected to the longitudinal rib and the stirrup, the central axis of the hinged axial rib overlaps the central axis of the cylindrical steel cage, and the radial rib is hinged on the hinged axial rib through the hinge hole. This design can make the radial ribs at the same height, and under the push of the driving plate, the radial ribs can have a uniform inclination angle, so that when the radial ribs are in the second position, the lower ends of the expansion ribs can be roughly located in the same horizontal circle to form a uniformly structured enlarged head.

[0011] Furthermore, a limit plate is fixedly mounted on the anchor rod, the limit plate is located in the cylindrical steel cage and at the lower side of the driving rod, and when the end of the driving plate away from the hinged portion presses against the limit plate, the radiating rib is in the second position. The limit plate is used to enable the radiating rib to smoothly reach the second position.

[0012] Furthermore, in order to prevent some of the radial ribs from deviating from their preset positions due to the impact of concrete when pouring concrete, a limiting notch is provided on the side of the hinged portion away from the driving rod, and the limiting notch has a limiting surface. When the radial rib is in the second position, the limiting surface is oriented away from the cylindrical steel cage and extends in the vertical direction;

[0013] A limiting mechanism is arranged on the cylindrical steel cage, and the limiting mechanism includes an annular plate, a limiting cylinder and a spring, wherein the annular plate is arranged in a horizontal direction and fixedly sleeved on the outer circumference of the cylindrical steel cage, the limiting cylinder is movably sleeved on the cylindrical steel cage and connected to the lower side of the annular plate via a spring; the spring is in a compressed state, and the limiting cylinder is pressed against the side of the hinge away from the expansion rib, and when the radial rib reaches the second position, the limiting cylinder can move downward and be inserted into the limiting notch under the push of the spring, so that the limiting surface is pressed against the inner surface of the limiting cylinder.

[0014] Due to the deformability of the elastic part, when concrete is poured into the pile hole, part of the expansion ribs will swing downward under the push of the concrete, causing the driving rod to swing upward and compress the elastic part through the driving plate, resulting in a smaller expansion radius of the expansion ribs, affecting the uniformity of the internal structure of the expansion head. The limiting cylinder is used to stably maintain the radial ribs in the second position to avoid them being affected by the concrete pouring.

[0015] Furthermore, the limiting mechanism further includes an inner cylinder, which is sleeved on the cylindrical steel cage and fixed on the lower side of the annular plate, and the limiting cylinder is freely sleeved on the inner cylinder. Since the spring has a certain flexibility, it may be displaced in the radial direction of the cylindrical steel cage, which may cause the problem that the limiting cylinder cannot move downward. The inner cylinder is used to limit the position of the limiting cylinder, ensuring that the limiting cylinder can move downward smoothly and lock all the radial ribs in the second position.

[0016] Furthermore, in order to allow the hinged portion to slide smoothly along the lower edge of the limiting cylinder when the radiating rib rotates, the side of the hinged portion away from the expansion rib presents an arc surface with the central axis of the hinge hole as the central axis, and the limiting cylinder can press against the arc surface. This design enables the limiting cylinder to remain basically stationary when the radiating rib rotates, until the limiting notch faces the limiting cylinder, and the limiting cylinder moves downward under the push of the spring and is clamped in the limiting notch, locking the radiating rib in the second position.

[0017] Secondly, the present application also discloses a construction method of an anchor pile, which uses the anchor pile reinforcement cage described in any one of the above items, and the construction method comprises the following steps:

[0018] (1) After the anchor pile reinforcement cage is manufactured, a limit rope sleeve is set on the latch pin to put the elastic member in a compressed state;

[0019] (2) drilling a hole underground with a drilling machine to form a pile hole, wherein the pile hole includes a main hole for connecting to the ground and an expansion portion connected to the lower end of the main hole, wherein the expansion portion is used to accommodate an enlarged head steel cage of the anti-anchor pile steel cage;

[0020] (3) The radial reinforcement is placed in the first position, the anchor pile reinforcement cage is lowered into the pile hole, the enlarged head reinforcement cage is accommodated in the expansion part, the latch is pulled upward, the latch is pulled out, the limit rope is separated from the latch, the restriction on the elastic member is eliminated, the elastic member rebounds, and the driving plate is pushed downward, so that the radial reinforcement rotates and reaches the second position;

[0021] (4) Pour concrete into the pile hole to form an anchor pile.

[0022] When adopting this construction method, it is only necessary to complete the excavation of the pile hole according to the traditional construction method, put the above-mentioned anchor pile steel cage into the pile hole, and make the expanded head steel cage located in the expansion part used to form the expanded head, and then pull the pin upward to make the limit rope leave the pin and release the drive plate. Under the push of the elastic part, the drive plate pushes the end of the drive rod away from the hinge part downward, so that the radial ribs rotate and reach the second position, and the lower end of the expansion ribs swing radially outward to expand the radius of the expanded head steel cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the anchor pile reinforcement cage in the present invention, specifically a state diagram when the radial reinforcement is in the first position.

[0024] Figure 2 This is the state diagram when the radiation rib is in the second position.

[0025] Figure 3 It is a schematic diagram of the structure of the radial ribs.

[0026] Figure 4 yes Figure 1 Enlarged view of part A.

[0027] Figure 5 yes Figure 4 Another state diagram of .

[0028] Figure 6 yes Figure 1 Enlarged view of part B.

[0029] Figure 7It is the construction flow chart of anchor piles. DETAILED DESCRIPTION

[0030] The structure of the anchor pile reinforcement cage 100 is first described below. Figure 1-Figure 6 The anchor pile reinforcement cage 100 includes an enlarged head reinforcement cage and an anchor 13, wherein the enlarged head reinforcement cage has a cylindrical reinforcement cage 102 composed of interconnected longitudinal bars 11 and stirrups 12, and the central axis 101 of the cylindrical reinforcement cage 102 extends in the vertical direction. In this embodiment, the cylindrical reinforcement cage 102 is made of prestressed concrete threaded steel bars to ensure the combination of the pull-out pile reinforcement cage and the concrete.

[0031] The lower end of the anchor rod 13 passes through the entire cylindrical steel cage downward and is fixedly connected to the cylindrical steel cage 102. Specifically in this embodiment, the anchor rod 13 is made of threaded steel. An upper connector 18 and a lower connector 16 are welded to the top and bottom of the cylindrical steel cage 102, respectively. The anchor rod 13 passes through the upper connector 18 and the lower connector 16, and is fixed to the cylindrical steel cage with an upper nut 17 and a lower nut 15, wherein the upper nut 17 is installed on the upper and lower sides of the upper connector, and the lower nut 15 is installed on the upper and lower sides of the lower connector; the central axis of the anchor rod 13 overlaps with the central axis 101 of the cylindrical steel cage. The upper connector 18 and the lower connector 16 are both made of steel plates.

[0032] A plurality of radiating ribs 20 are arranged around the cylindrical steel cage 102 . In this embodiment, eight radiating ribs 20 are specifically provided. The eight radiating ribs 20 are evenly arranged around the cylindrical steel cage 102 .

[0033] Each radial rib 20 includes an expansion rib 21 and a driving rod 27. One end of the expansion rib 21 is connected to one end of the driving rod 27 via a hinge portion 22. The expansion rib and the driving rod are arranged in an L shape, and a hinge hole 25 is provided on the hinge portion 22. An annular hinge axis rib 19 is provided on the outside of the cylindrical steel cage. The hinge axis rib 19 is welded to the longitudinal rib via a connecting rib 14. The central axis of the hinge axis rib overlaps the central axis of the cylindrical steel cage. The radial rib 20 is hinged to the hinge axis rib 19 via a hinge hole 25. It can be understood that in another embodiment, the hinge axis rib 19 can also be welded to the stirrup via a connecting rib 14. In the free state, the radial rib is in the first position. In order to avoid the anchor pile steel cage from being stuck due to the expansion rib touching the inner wall of the pile hole when sinking into the pile hole, the lower end of the expansion rib is bent inward to form a bending portion 211.

[0034] The driving rod 27 extends into the inner cavity of the cylindrical steel cage 102, and the expansion rib 21 is located outside the cylindrical steel cage. An upper end plate is fixedly mounted on the anchor rod. Specifically in the present embodiment, the upper connecting member 18 is also formed as the upper end plate. A pin hole 46 and a rope hole 45 are provided on the upper end plate, and a pin 44 is movably inserted into the pin hole. A circular driving plate 41 is movably mounted on the anchor rod 13. The driving plate 41 is located in the cylindrical steel cage and between the upper end plate and the driving rod. An elastic member 47 is provided between the upper end plate and the driving plate. In the present embodiment, the elastic member is specifically a cylindrical helical compression spring, which is mounted on the anchor rod, and the two ends of the cylindrical helical compression spring are respectively welded to the upper end plate and the driving plate. A rope ring 42 is welded on the upper side of the driving plate, and the rope ring 42 is located directly below the rope threading hole 45. One end of the limiting rope 43 is fixed to the driving plate, and the other end of the limiting rope can pass through the rope threading hole 45 and be sleeved on the pin.

[0035] In order to ensure that the driving plate slides smoothly along the anchor rod, a sleeve 411 is welded at the center of the driving plate, and the driving plate is movably sleeved on the anchor rod through the sleeve 411.

[0036] A circular limit plate 48 is welded on the anchor rod. The limit plate is located in the cylindrical steel cage and at the lower side of the driving rod. When the end of the driving plate away from the hinged portion presses against the limit plate, the radiating ribs are in the second position.

[0037] When the limiting rope loop is arranged on the latch, the cylindrical helical compression spring is in a compressed state, so that the radiating rib can be in the first position; when the latch is pulled out, the limiting rope is separated from the latch, eliminating the restriction on the cylindrical helical compression spring, and the cylindrical helical compression spring rebounds and pushes the driving plate to move downward. The pushing plate can push the end of the driving rod away from the hinge part to move downward, so that the radiating rib rotates and reaches the second position. Figure 1 In the figure, the radiating ribs are in the first position. Figure 2 In the embodiment, the radiating ribs are in the second position.

[0038] To facilitate pulling the latch 44 out of the rope threading hole, in this embodiment, the latch 44 specifically includes a pin shaft 441 and a steel ring 442 welded to the top of the pin shaft, and the rope 61 used to pull the latch can be fixed on the steel ring 442.

[0039] When the radiating ribs are in the first position, the expansion ribs extend downward, the driving rod is in a horizontal state, and the anchor pile reinforcement cage can be freely placed in the pile hole using the anchor pile reinforcement cage; when the radiating ribs are in the second position, the lower end of the expansion ribs tilts downward and extends away from the cylindrical reinforcement cage, and the distance from the lower end of the expansion ribs to the central axis of the cylindrical reinforcement cage is 3.5 times the radius of the cylindrical reinforcement cage.

[0040] In the embodiment, when the expansion rib is in the first position, the driving rod is in a horizontal state, the radiating rib is inclined downward and extends in a direction away from the cylindrical steel cage, and the angle between the radiating rib and the vertical direction is 4°. It can be understood that in other embodiments, the angle between the radiating rib and the vertical direction can also be 1°, 2°, 3° or 5°. Of course, when the expansion rib is in the first position, the radiating rib can also extend downward in the vertical direction, that is, the angle between the radiating rib and the vertical direction is 0°.

[0041] In order to improve the stability of the expansion rib when it is in the second position, a limiting notch 23 is provided on the side of the hinged portion 22 away from the driving rod 27. The limiting notch has a limiting surface 24. When the radial rib is in the second position, the limiting surface 24 is directed away from the cylindrical steel cage 102 and extends in the vertical direction.

[0042] A limiting mechanism 30 is provided on the cylindrical steel cage 102, and the limiting mechanism includes an annular plate 31, a limiting cylinder 33, an inner cylinder 32 and a spring 34, wherein the spring is a cylindrical helical compression spring. The annular plate 31 is arranged in the horizontal direction and sleeved on the outer circumference of the cylindrical steel cage. In this embodiment, the annular plate 31 is welded on the longitudinal rib 11, the limiting cylinder 33 is movably sleeved on the cylindrical steel cage and connected to the lower side of the annular plate through a spring; the inner cylinder is sleeved on the cylindrical steel cage and welded on the lower side of the annular plate, and the limiting cylinder is freely sleeved on the inner cylinder. In this embodiment, four springs 34 are evenly arranged on the lower side of the annular plate along the circumferential direction of the annular plate.

[0043] See also Figure 4 and Figure 5 The spring 34 is in a compressed state, and the limiting cylinder is pressed against the side of the hinge part 22 away from the expansion rib. When the radiation rib 20 reaches the second position, the limiting cylinder can move downward and insert into the limit notch under the push of the spring, so that the limiting surface 24 is pressed against the inner surface of the limiting cylinder. In order to avoid the jamming phenomenon of the rotation of the radiation rib caused by the friction between the limiting cylinder and the hinge part, the side of the hinge part away from the expansion rib is an arc surface 26 with the central axis of the hinge hole as the central axis, and the limiting cylinder can be pressed against the arc surface.

[0044] The following is an explanation of the construction method of the anchor pile in this application. Figure 7 , the construction method comprises the following steps:

[0045] (1) After the anchor pile reinforcement cage is manufactured, a limit rope sleeve is set on the latch pin to put the elastic member in a compressed state.

[0046] (2) Please refer to Figure 7In step (a), a hole is drilled underground with a drilling machine to form a pile hole, wherein the pile hole comprises a main hole 51 for connecting to the ground and an expansion portion 52 connected to the lower end of the main hole 51, wherein the expansion portion 52 is used to accommodate the enlarged head steel cage of the anti-anchor pile steel cage. A tapered section 53 is used to transition between the main hole 51 and the expansion portion 52.

[0047] (3) Please refer to Figure 7 (b) and 7 (c), the radial ribs are in the first position, the anchor pile steel cage 100 is lowered into the pile hole, the enlarged head steel cage is accommodated in the expansion part, and the top of the anchor rod is 50 above the ground. The lower end of the soft rope 61 is fixed on the steel ring 442, and the upper end of the soft rope 61 is kept on the ground. When the enlarged head steel cage is accommodated in the expansion part, the soft rope 61 is pulled to pull the pin upward, and the pin is pulled out of the pin hole, so that the limit rope is separated from the pin, eliminating the restriction on the elastic member, the elastic member rebounds, and pushes the driving plate to move downward, so that the radial ribs rotate and reach the second position. At the same time, the limiting cylinder moves downward under the push of the spring and is clamped into the limiting notch, and the limiting surface 24 presses against the inner surface of the limiting cylinder.

[0048] (4) Please refer to Figure 7 (d) Arrangement: Concrete is poured in the pile hole to form an anchor pile 600. The anchor pile 600 includes a cylindrical body 601 formed in the main hole 51, and an enlarged head 602 connected to the lower end of the body 601 and formed on the expansion part 52.

Claims

1. An anchor pile reinforcement cage, characterized in that: It comprises an enlarged head steel cage and an anchor rod; the enlarged head steel cage comprises a cylindrical steel cage composed of longitudinal bars and stirrups connected to each other, the central axis of the cylindrical steel cage extends in the vertical direction, a plurality of radial bars are arranged around the cylindrical steel cage, each radial bar comprises an expansion bar and a driving rod, one end of the expansion bar is connected to one end of the driving rod via a hinged portion, the expansion bar and the driving rod are arranged in an L shape, a hinged hole is provided on the hinged portion, and the radial bar is hinged to the cylindrical steel cage via the hinged hole; in a free state, the radial bar is in a first position; The driving rod extends into the inner cavity of the cylindrical steel cage, and the expansion ribs are located outside the cylindrical steel cage; an upper end plate is fixedly installed on the anchor rod, and a latch is movably inserted on the upper end plate; a driving plate is movably sleeved on the anchor rod, and the driving plate is located in the cylindrical steel cage and between the upper end plate and the driving rod, and an elastic member is arranged between the upper end plate and the driving plate, and the two ends of the elastic member are respectively connected to the upper end plate and the driving plate; one end of the limiting rope is fixed on the driving plate, and the other end of the limiting rope can be sleeved on the latch; When the limit rope sleeve is arranged on the latch, the elastic member is in a compressed state, so that the radiating rib can be in the first position; when the latch is pulled out, the limit rope is separated from the latch, eliminating the restriction on the elastic member, and the elastic member can rebound and push the driving plate to move downward, and the pushing plate can push the end of the driving rod away from the hinged part to move downward, so that the radiating rib rotates and reaches the second position; When the radiating ribs are in the first position, the expansion ribs extend downward, the driving rod is in a horizontal state, and the anchor pile reinforcement cage can be freely placed in the pile hole using the anchor pile reinforcement cage; when the radiating ribs are in the second position, the lower end of the expansion ribs is inclined downward and extends away from the cylindrical reinforcement cage, and the distance from the lower end of the expansion ribs to the central axis of the cylindrical reinforcement cage is 2-4 times the radius of the cylindrical reinforcement cage.

2. The anchor pile reinforcement cage according to claim 1, characterized in that: When the expansion ribs are in the first position, the driving rod is in a horizontal state, the radiating ribs extend downward in the vertical direction or tilt downward and extend in a direction away from the cylindrical steel cage, and the angle between the radiating ribs and the vertical direction is 0-5°.

3. The anchor pile reinforcement cage according to claim 1, characterized in that: The cylindrical steel cage has an annular hinged axial reinforcement, which is connected to the longitudinal reinforcement and the stirrups. The central axis of the hinged axial reinforcement overlaps the central axis of the cylindrical steel cage, and the radial reinforcement is hinged on the hinged axial reinforcement through the hinge hole.

4. The anchor pile reinforcement cage according to claim 1, characterized in that: A limit plate is fixedly mounted on the anchor rod, the limit plate is located in the cylindrical steel cage and at the lower side of the driving rod, when the end of the driving plate away from the hinged portion presses against the limit plate, the radiating ribs are in the second position.

5. The anchor pile reinforcement cage according to claim 1, characterized in that: A limiting notch is provided on a side of the hinged portion away from the driving rod, the limiting notch having a limiting surface, and when the radiating rib is in the second position, the limiting surface faces away from the cylindrical steel cage and extends in the vertical direction; A limiting mechanism is arranged on the cylindrical steel cage, and the limiting mechanism includes an annular plate, a limiting cylinder and a spring, wherein the annular plate is arranged in a horizontal direction and fixedly sleeved on the outer circumference of the cylindrical steel cage, the limiting cylinder is movably sleeved on the cylindrical steel cage and connected to the lower side of the annular plate via a spring; the spring is in a compressed state, and the limiting cylinder is pressed against the side of the hinge away from the expansion rib, and when the radial rib reaches the second position, the limiting cylinder can move downward and be inserted into the limiting notch under the push of the spring, so that the limiting surface is pressed against the inner surface of the limiting cylinder.

6. The anchor pile reinforcement cage according to claim 5, characterized in that: The limiting mechanism also includes an inner cylinder, which is sleeved on the cylindrical steel cage and fixed on the lower side of the annular plate, and the limiting cylinder is freely sleeved on the inner cylinder.

7. The anchor pile reinforcement cage according to claim 5, characterized in that: The side of the hinge portion facing away from the expansion rib is an arc surface with the central axis of the hinge hole as the central axis, and the limiting cylinder can be pressed against the arc surface.

8. A method for constructing an anchor pile, characterized in that: Using the anchor pile reinforcement cage according to any one of claims 1 to 7, the construction method comprises the following steps: (1) After the anchor pile reinforcement cage is manufactured, a limit rope sleeve is set on the latch pin to put the elastic member in a compressed state; (2) drilling a hole underground with a drilling machine to form a pile hole, wherein the pile hole includes a main hole for connecting to the ground and an expansion portion connected to the lower end of the main hole, wherein the expansion portion is used to accommodate an enlarged head steel cage of the anti-anchor pile steel cage; (3) The radial reinforcement is placed in the first position, the anchor pile reinforcement cage is lowered into the pile hole, the enlarged head reinforcement cage is accommodated in the expansion part, the latch is pulled upward, the latch is pulled out, the limit rope is separated from the latch, the restriction on the elastic member is eliminated, the elastic member rebounds, and the driving plate is pushed downward, so that the radial reinforcement rotates and reaches the second position; (4) Pour concrete into the pile hole to form an anchor pile.

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