A recyclable central anchor cable and its use method

Abstract

The present application relates to the field of construction, and specifically to a working rope recyclable central anchor rope and a method for using the same. A recyclable central anchor rope, the anchor rope is composed of an anchor head, a working rope and a recovery rope, the anchor head includes an outer shell cover and a bearing plate, an anchor ring is installed on the bearing plate, a cavity is arranged inside the anchor ring, a central column is arranged on the upper side of the cavity, the central column is a columnar integral structure, the lower side of the cavity is a reserved cavity, a locking piece is also arranged between the central column and the inner side wall of the anchor ring, a limiting groove is arranged on the inner wall of the anchor ring, one end of the locking piece is located in the limiting groove to lock the central column and the anchor ring, and the other end is controlled by the recovery rope to keep the radial position of the locking piece fixed, as the recovery rope is pulled out, the locking piece can be radially retreated, the locking between the central column and the anchor ring is cancelled, the central column can move toward the reserved cavity, destroying the accommodating space of the conical clamp, the clamp loses the clamping force, and the working rope can be pulled out.

Description

Technical Field

[0001] The present application relates to the field of construction, and in particular to a working cable recyclable central anchor cable and a method for using the same. Background Art

[0002] Since the early 1990s, my country has begun to use a large number of anchor cable support technologies in deep foundation pits and slope reinforcement of urban buildings. The anchor cable provides a large pull-out force by setting a free section of a certain length at the near end and setting an anchor section in the stable rock and soil layer at the far end. The anchor cable is generally long, and the pull-out force is directly transmitted to the stable rock and soil layer at the far end through the steel strand and anchor head. Due to the convenience of anchor cable construction and low cost, it has been widely used in deep foundation pits of urban buildings. However, a large number of rod materials such as steel bars and steel strands that are difficult to tear are permanently buried underground, causing great difficulties for the foundation construction of subsequent surrounding projects. Therefore, developed countries such as Germany and Japan have long recognized its harmfulness and have actively begun to study recyclable anchor cables, such as DYWIDAY recyclable anchor cables (Germany) and JCE recyclable anchor cables (Japan).

[0003] Chinese patent publication number CN200964593Y discloses a recyclable anchor cable, which includes a pressure plate, a bearing body, and a steel strand. The bottom of the pressure plate is provided with an isolation groove, the top of the pressure plate is provided with an arc groove, a positioning plate is provided on the pressure plate on both sides of the arc groove, and a positioning groove is provided in the middle of the bottom surface of the pressure plate. The bearing body is composed of a group of steel bars and steel rings. The steel bars are evenly arranged and welded on the inner side of the steel rings. The front end of the steel bars is located in the positioning groove and is welded and fixed to the pressure plate. The steel strand is "center" shaped, and its front end is located in the arc groove at the top of the pressure plate. Both sides of the steel strand are located in the isolation groove at the bottom of the pressure plate. The steel strands are arranged in pairs, and when they are recovered, one of the steel strands is tensioned to bypass the arc groove at the anchor head and be pulled out. When the steel strand is recovered, the curvature radius of the arc groove is small, and the rigidity of the steel strand itself is large. During the recovery and drawing process, the steel strand is greatly deformed, and the pulling force is also large, which makes the recovery difficult.

[0004] The JCE recovery anchor cable in Japan is equipped with a recovery cable (withdrawal wire), which clamps the PC steel wire rope and the withdrawal wire of the tensile member through a fixed base, a crimping clamp, and a coupling body. The coupling body is composed of the withdrawal wire clamped by the crimping clamp and a stopper integrated with it. During recovery, the coupling body is pulled out as a whole by applying a large enough force to break the stopper integrated with the coupling body by pulling out the steel wire rope, thereby eliminating the locking of the steel wire rope of the tensile member. This method requires a large enough pulling force to break the stopper integrated with the coupling body, and it is also necessary to overcome the clamping friction between the coupling body and the crimping clamp of the tensile steel wire rope, so a large pulling force is required; in addition, after loosening, the coupling body and the recovery cable are still clamped into one by the crimping clamp, and there is no resistance device to separate the two; in addition, since the crimping clamp has no taper, it is difficult to further clamp when the PC steel wire rope of the tensile member is stretched, and it is easy to slip. This solution has a complex structure, high cost, and a long anchor head size. Summary of the invention

[0005] In order to solve the above technical problems, one purpose of the present application is to provide an anchor cable with a recyclable working cable, wherein the recyclable central anchor cable has a strong structure and a stable use state during operation, and is easy to loosen after completing the function so that the main reinforcement can be removed. In addition, the present application also provides a method for using the above recyclable central anchor cable.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] A recyclable central anchor cable, which consists of an anchor head, a working cable and a recovery cable. The anchor head includes an outer shell cover and a bearing plate. An anchor ring is installed on the bearing plate. A cavity is arranged inside the anchor ring. A central column is arranged on the upper side of the cavity. The central column is a columnar integral structure. The lower side of the cavity is a reserved cavity. A central hole for the recovery cable to pass through is arranged at the center of the central column. The recovery cable passes through the bearing plate. One end of the recovery cable is placed in the central hole. The central column and the anchor ring are assembled into a plurality of conical clamp accommodating spaces. A clamp is arranged in the clamp accommodating space. The clamp is composed of multiple clips, the working rope passes through the bearing plate, and the ends are clamped and fixed by the clips; a locking piece is also arranged between the central column and the inner side wall of the anchor ring, and a limiting groove is arranged on the inner wall of the anchor ring. One end of the locking piece is located in the limiting groove to lock the central column and the anchor ring, and the other end is controlled by the recovery rope to keep the radial position of the locking piece fixed. As the recovery rope is pulled out, the locking piece can retreat radially, canceling the locking between the central column and the anchor ring, and the central column can move toward the reserved cavity, destroying the accommodating space of the conical clamp, the clip loses the clamping force, and the working rope can be pulled out.

[0008] As a further improvement, one end of the locking piece is a hemispherical body or a wedge-shaped body.

[0009] As a further improvement, a first lateral through hole for the locking piece to pass through is provided on the side of the central column where the locking piece is located, the first lateral through hole is connected to the central hole, the locking piece is arranged in the first lateral through hole, one end of the locking piece is abutted against the recovery rope, and as the recovery rope is pulled out, the locking piece can retreat to the central hole.

[0010] As a further improvement, the locking member is composed of a first limiting round pin and a steel ball. The first limiting round pin is located in the first lateral through hole. One end of the first limiting round pin is against the steel ball. The steel ball is located in the space formed by the limiting groove and the first limiting round pin to lock the center column and the anchor ring. The other end of the first limiting round pin is against the recovery rope.

[0011] As a further improvement, the locking piece is located at the upper part of the reserved cavity, and the locking piece is composed of a limit frame and a steel ball. The middle part of the limit frame is connected to the recovery cable, and can move downward with the recovery cable and destroy the connection with the recovery cable under strong pulling force at the bottom of the reserved cavity. The steel ball is located in the space formed by the limit frame and the limit groove, and the steel ball locks the central column and the anchor ring.

[0012] As a further improvement, the outer ring of the limiting frame is provided with a notch, and the steel ball is located in the space formed by the notch and the limiting groove.

[0013] As a further improvement, a trapezoidal limiting groove is provided on the inner side wall of the anchor ring at the locking member position, and one end of the locking member is located in the trapezoidal limiting groove; or, a second lateral circular hole is provided on the inner side wall of the anchor ring at the locking member position, and a second limiting circular pin is provided in the second lateral circular hole, and the inner end of the second limiting circular pin abuts against the end of the locking member, and the outer end abuts against the inner side wall of the shell base.

[0014] As a further improvement, a conical space for accommodating one clip is provided at the corner of the central column, and a conical space for accommodating another clip is provided at a position corresponding to the corner on the inner wall of the anchor ring; the number of accommodating spaces of the assembled conical clamp is 2, 3 or more.

[0015] As a further improvement, the bearing plate is provided with an outer shell base, the outer shell base is wrapped around the outer side of the anchor ring, and a pre-tightening plate is provided inside the outer shell cover, the lower part of the pre-tightening plate is abutted against the upper end surface of the clamp to pre-tighten the clamp, and a plurality of first circular holes for the working rope and the recovery rope to pass through are provided on the pre-tightening plate; a plurality of second circular holes for the working rope and the recovery rope to pass through are provided on the bearing plate, and an interface tube is provided at the bottom of the second circular hole.

[0016] In addition, the present application also provides a method for using the recyclable central anchor cable, which comprises the following steps:

[0017] 1) After the working surface is dug out on the slope of the foundation pit, a downward inclined hole with a certain diameter is first drilled in the soil to a predetermined depth using an anchor bolter, and then the recyclable central anchor cable is placed into the hole together with the grouting pipe, and the cement slurry is filled to the hole mouth through the bottom grouting process;

[0018] 2) When the cement slurry and other anchor bodies reach the required strength, the working cable is tensioned with a jack at the outer end away from the anchor head. The tension on the working cable is transmitted to the anchor head deep in the soil. Under the action of the tension, the working cable drives the clamp to move together, and the clamp further clamps the anchor ring and the center column, and transmits the force to the bearing plate at the bottom of the anchor head. The bearing plate presses the cement anchor body in the outer soil to obtain pull-out resistance.

[0019] 3) When the anchor cable completes its tensioning work and is discarded, it can be recovered; first, the recovery cable is pulled out with a small force on the outside, and the locking part retreats to the center hole, thereby canceling the restriction on the movement of the center column to the cavity. After the center column moves to the cavity, the lock on the working cable clip is released, and the working cable is recovered.

[0020] Through the above technical scheme, when the present application is used, after the working surface is excavated from the slope, a circular hole with a given downward inclination angle is drilled in the soil of the slope with a casing anchor bolt machine, and then the recyclable central anchor cable made in the factory is placed in the hole together with the grouting pipe, and the hole is filled with cement slurry using the bottom grouting process. Other liquid slurries with sufficient material strength after solidification can also be used. When the slurry anchor body reaches a certain strength, the anchor cable can be tensioned, and the working cable is tensioned as a whole at the outer end with a jack. The tension of the working cable interacts through the anchor rings, clips, and central columns that are clamped to each other in the anchor head, and the tension load on the working cable is transmitted to the bearing plate. The bearing plate then presses the slurry anchor body. Since the anchor body set in the soil body and the soil body have friction, the anchoring force of the central anchor cable is obtained.

[0021] When the anchor cable is abandoned after completing its supporting function, the main reinforcement can be recovered. In the current locked state of the anchor cable, the recovery cable is pulled out with a small force from the outside. The locking part has space for radial movement, and the locking part retreats to the center hole, releasing the lock between the center column and the anchor ring. The center column can move axially toward the cavity, and the center column releases the lock on the working cable clip. The working cable automatically pops out under the action of the residual locking force. Alternatively, the tension on the original working cable can be released first, and then the recovery cable is pulled out, and then the unlocked working cables are pulled out one by one.

[0022] The structural design of the present application is novel and simple. The recovery rope can be pulled out with a small force, the locking piece is released from restriction, and the central column can move downward into the cavity, thereby releasing the lock between the clip and the working rope and completing the recovery of the main reinforcement. The recovery process of the anchor rope with this structure is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the usage status of this application.

[0024] Figure 2 It is a cross-sectional schematic diagram of the internal structure of the anchor head.

[0025] Figure 3 for Figure 2 Schematic diagram of the cross-section of the internal structure of the anchor head after rotating 45 degrees.

[0026] Figure 4 for Figure 2 Schematic diagram of another cross-sectional view of the structure inside the anchor head after rotating 45 degrees.

[0027] Figure 5 The present invention is a structural schematic diagram of a fixed connection between a limiting member and a recovery cable.

[0028] Figure 6 A shape of a locking piece.

[0029] Figure 7 It is another shape of the locking piece.

[0030] Figure 8 This is a diagram of the anchor ring and center column being assembled.

[0031] Fig. 9 for Figure 8 AA section surface.

[0032] Fig.10 This is the top view of the central cylinder.

[0033] Fig.11 This is the bottom view of the central cylinder.

[0034] Fig.12 , Fig.13 The anchor ring and the center column are assembled into three and two conical hole diagrams.

[0035] Fig.14 This is a schematic diagram of the locking part retracting after the recovery cable is pulled out.

[0036] Fig.15 Schematic diagram of the clip falling off after the recovery cable is pulled out of the central column and moved downward.

[0037] In the figure: 1-anchor head, 2-working rope, 3-recovery rope, 4-interface pipe, 5-bearing plate, 6-anchor ring, 7-clamp, 8-shell base, 9-center column, 10-pre-tightening plate positioning strip, 11-shell cover, 12-pre-tightening plate, 13-limiting groove, 14-limiting frame, 15-locking piece, 16-cavity, 17-plastic sleeve, 18-second limiting round tip, 19-slurry anchor body enlarged head, 20-locking anchor, 21-natural ground, 22-deep foundation pit bottom, 23-guarding pile, 24-slurry anchor body, 25-first limiting round tip, 26-steel ball. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods are given.

[0039] like Figure 1 , Figure 2 , Figure 3 A recoverable central anchor cable is shown, which consists of an anchor head 1, a working cable 2 and a recovery cable 3. The anchor head 1 includes an outer shell cover and a bearing plate 5. An anchor ring 6 is installed on the bearing plate 5. A cavity is arranged inside the anchor ring 6. A central column 9 is arranged at the upper part of the central part of the cavity, and a reserved cavity 16 is arranged at the lower part. A central hole for the recovery cable 3 to pass through is arranged at the center of the central column 9. The recovery cable 3 passes through the bearing plate 5, and the end of the recovery cable is located in the central hole.

[0040] like Figure 8 As shown, the center column 9 and the inner side wall of the anchor ring 6 are evenly assembled into four clamp accommodating spaces in the circumferential direction (of course, as shown in FIG. Fig.12 , Fig.13 The number of the clamp accommodating spaces shown may be 3, 2 or more), and a clamp is arranged in the clamp accommodating space. Figure 2 , Figure 3 As shown, the central column 9 is a columnar body, the upper part of the inner side wall of the anchor ring 6 is a conical surface, the clamp formed by the two clips 7 is an inverted cone, and the clamp is arranged in the inverted cone clamp accommodation space formed by the central column 9 and the anchor ring 6. The clamp is composed of two clips 7, and the two clips 7 are supported and arranged in the clamp accommodation space. The working rope 2 passes through the bearing plate 5, and the end is clamped and fixed by the two clips 7. The fixing method of the working rope 2 and the clip can be clamping teeth.

[0041] like Figure 3 , Figure 6 , Figure 7As shown, a locking piece 15 is also provided between the central column 9 and the inner wall of the anchor ring 6, one end of the locking piece 15 is a hemispherical body or a wedge-shaped body, and a limiting groove 13 is provided on the inner wall of the anchor ring. One end of the locking piece 15 is located in the limiting groove 13 to lock the central column 9 and the anchor ring 6, and the locking piece 15 supports the relative position of the central column 9 and the anchor ring 6; in this way, the anchor ring, the working cable, the clip, and the central column are radially clamped with each other and are arranged as a whole on the bearing plate and the shell base. When the anchor cable is in the tensioning working state, the tension on the working cable is transmitted to the bearing plate through the anchor ring, the clip, and the central column, and then transmitted to the surrounding rock and soil layer through the bearing plate and the anchor body. A first lateral circular hole is provided on the side of the central column 9 supporting the position of the locking piece 15, through which the locking piece 15 can pass. One end of the locking piece extends to the central hole and abuts against the recovery rope 3. After the recovery rope 3 is pulled out, the locking piece 15 can retreat to the central hole. The locking piece 15 is completely received in the first lateral circular hole, and the central column 9 loses support and can move downward.

[0042] like Figure 3 As shown, the inner wall of the anchor ring 6 is provided with a limiting groove 13 at the position of the locking member 15, and one end of the locking member 15 is located in the limiting groove; a further improvement may also be adopted Figure 4 The structure comprises a second lateral circular hole penetrating the inner wall of the anchor ring 6 at the position of the locking piece 15, and a second limiting circular pin 18 is arranged in the second lateral circular hole, the inner end of the limiting circular pin abuts against the locking piece, and the outer end abuts against the inner wall of the shell base 8.

[0043] In addition, if Figure 5 As shown, the locking member 15 described in the present application is located at the upper part of the reserved cavity 16, and the locking member 15 is composed of a limit frame 14 and a steel ball 26. The central part of the limit frame 14 is connected to the recovery cable 3, and can move downward with the recovery cable 3 and destroy the connection with the recovery cable 3 under a strong pulling force at the bottom of the reserved cavity 16. The outer ring of the limit frame 14 is provided with a notch, and the steel ball 26 is located in the space formed by the notch and the limit groove 13. The steel ball 26 locks the central column 9 and the anchor ring 6. A limit frame 14 is used to limit the radial retreat of the locking member. The limit frame 14 is arranged in the reserved cavity 16, and the central part of the limit frame 14 is connected and fixed to the recovery cable 3. The outer ring of the limit frame can be provided with a circumferential notch, and the steel ball 26 is radially limited and arranged on the outer ring of the limit frame. When the recovery cable 3 is pulled, the limit frame 14 is pulled down with the recovery cable 3, and the steel ball 26 loses support radially and rolls into the reserved cavity 16. After the central column is unlocked, it moves into the cavity 16, and the working cable clip is unlocked. The recovery cable can be further disconnected from the limit frame 14 by the outer pulling force, and the recovery cable can be pulled out.

[0044] like Fig.10 , Fig.11 The cross section of the central column 9 is a quadrilateral (of course, Fig.12 , Fig.13 As shown, the cross section of the central column 9 can also be hexagonal or triangular). The central column is an integral columnar body with a relatively strong structure. A space for accommodating a clip 7 is provided at the corner of the central column 9, and a space for accommodating another clip 7 is provided at the position of the inner side wall of the anchor ring 6 corresponding to the corner, and together they form a conical clamp accommodating space.

[0045] like Figure 2 As shown, the bearing plate 5 is also provided with a shell base 8, which is wrapped around the outside of the anchor ring 6, and a pre-tightening plate 12 is provided inside the shell cover 11, the lower part of the pre-tightening plate 12 abuts against the upper end surface of the clamp to pre-tighten the clamp, a pre-tightening plate positioning strip is provided between the pre-tightening plate 12 and the shell cover 11 for positioning, and a first circular hole for the working rope 2 and the recovery rope 3 to pass through is provided on the pre-tightening plate 12. The bearing plate 5 is also provided with a second circular hole for the working rope 2 and the recovery rope 3 to pass through, and an interface tube 4 is provided at the bottom of the second circular hole. When assembling the present application, the central column is placed at the center of the anchor ring, the recovery rope passes through the middle hole of the central column, and the above components are fixed together with the locking piece and the limit groove, the working rope passes through the conical hole formed by the anchor ring and the central column, and the working rope is clamped to the anchor ring and the central column with a clamp. Then, the top of the clip is compressed by the outer shell cover and its pre-tightening plate positioning strip and the pre-tightening plate to prevent the clip from loosening during the transportation and installation of the anchor cable.

[0046] like Figure 1 As shown, after the working surface is dug out of the foundation pit slope, an inclined hole with a certain diameter is first drilled in the soil with an anchor bolter to a predetermined length, and then the factory-produced central anchor cable is placed in the hole together with the grouting pipe, and the cement slurry is filled to the hole mouth through the hole bottom grouting process. Multiple anchor heads 1 can be set according to the required pull-out resistance. When the cement slurry anchor body reaches the required strength, the working cable 2 is tensioned at the outer end away from the anchor head 1 with a jack. During the working cable being stretched, the clamp further clamps the anchor ring and the central column into a solid whole, and the tensile load on the working cable is transmitted to the bearing plate as a whole through the bottom surface of the anchor ring. The bearing plate presses the surrounding anchor body enlarged head and anchor body, and the anchor body and the surrounding rock and soil body generate friction, so that the anchor cable obtains pull-out resistance.

[0047] like Fig.14 , Fig.15 As shown, when the anchor cable has completed its enclosure function and is abandoned, it can be recovered. First, the tension on the working cable 2 is removed from the outside. At this time, the working cable is in a zero tension state. The recovery cable 3 is pulled out with a small force at the outer end. The locking member 15 has space for radial movement. The locking member retreats toward the center hole, canceling the restriction on the movement of the central column 9 toward the cavity 16, allowing the central column to move toward the cavity, releasing the lock on the working cable clip, and then the working cables are pulled out one by one at the outer end.

[0048] The above is a description of the embodiments of the present application. Through the above description of the disclosed embodiments, professionals in the field can implement or use the present application. Various modifications to these embodiments will be apparent to professionals in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will comply with the widest scope consistent with the principles and novelties disclosed herein.

Claims

1. A retrievable central anchor cable, the anchor cable comprising an anchor head (1), a working cable (2) and a recovery cable (3), the anchor head (1) comprising an outer shell and a bearing plate (5), an anchor ring (6) being mounted on the bearing plate (5), a cavity being arranged inside the anchor ring (6), It is characterized in that A central column (9) is arranged on the upper side of the cavity. The central column (9) is a columnar integral structure. The lower side of the cavity is a reserved cavity (16). A central hole for the recovery cable (3) to pass through is arranged at the center of the central column (9). The recovery cable (3) passes through the bearing plate (5). One end of the recovery cable (3) is placed in the central hole. The central column (9) and the anchor ring (6) are assembled into a plurality of conical clamp accommodating spaces. A clamp is arranged in the clamp accommodating space. The clamp is composed of a plurality of clamping pieces (7). The working cable (2) passes through the bearing plate (5). The end of the working cable (2) is clamped and fixed by the clamping piece (7). The central column (9) A locking piece (15) is also arranged between the inner wall of the anchor ring (6), and a limiting groove (13) is arranged on the inner wall of the anchor ring. One end of the locking piece (15) is located in the limiting groove (13) to lock the central column (9) and the anchor ring (6), and the other end is controlled by the recovery rope (3) to keep the radial position of the locking piece (15) fixed. As the recovery rope (3) is withdrawn, the locking piece (15) can retreat radially toward the center hole, canceling the locking between the central column (9) and the anchor ring (6), and the central column (9) can move toward the reserved cavity (16), destroying the accommodating space of the conical clamp, the clamping piece (7) loses the clamping force, and the working rope (2) can be withdrawn.

2. A recyclable central anchor cable according to claim 1, It is characterized in that One end of the locking piece (15) is a hemispherical body or a wedge-shaped body.

3. A recyclable central anchor cable according to claim 1, It is characterized in that A first lateral through hole for the locking piece (15) to pass through is arranged on the side of the central column (9) where the locking piece (15) is located. The first lateral through hole is connected to the central hole. The locking piece (15) is arranged in the first lateral through hole. One end of the locking piece (15) abuts against the recovery cable (3). As the recovery cable (3) is withdrawn, the locking piece (15) can retreat toward the central hole.

4. A recyclable central anchor cable according to claim 3, It is characterized in that The locking member (15) is composed of a first limiting round pin (25) and a steel ball (26). The first limiting round pin is located in the first lateral through hole. One end of the first limiting round pin abuts against the steel ball. The steel ball is located in the space formed by the limiting groove (13) and the first limiting round pin to lock the central column (9) and the anchor ring (6). The other end of the first limiting round pin abuts against the recovery rope (3).

5. A recyclable central anchor cable according to claim 1, It is characterized in that The locking member (15) is located at the upper part of the reserved cavity (16). The locking member (15) is composed of a limiting frame (14) and a steel ball (26). The middle part of the limiting frame (14) is connected to the recovery cable (3). The limiting frame (14) can move downward with the recovery cable (3) and break the connection with the recovery cable (3) under a strong pulling force at the bottom of the reserved cavity (16). The steel ball (26) is located in the space formed by the limiting frame (14) and the limiting groove (13). The steel ball (26) locks the central column (9) and the anchor ring (6).

6. A recyclable central anchor cable according to claim 5, It is characterized in that The outer ring of the limiting frame (14) is provided with a notch, and the steel ball (26) is located in a space formed by the notch and the limiting groove (13).

7. A recyclable central anchor cable according to claim 1, It is characterized in that The inner wall of the anchor ring (6) is provided with a trapezoidal limiting groove (13) at the position of the locking member (15), and one end of the locking member (15) is located in the trapezoidal limiting groove; or, the inner wall of the anchor ring (6) is provided with a second lateral circular hole penetrating the side wall at the position of the locking member (15), and a second limiting circular pin (18) is provided in the second lateral circular hole, and the inner end of the second limiting circular pin abuts against the end of the locking member (15), and the outer end abuts against the inner wall of the housing base (8).

8. A recyclable central anchor cable according to claim 1, It is characterized in that A conical space for accommodating one clip (7) is provided at a corner of the central column (9), and a conical space for accommodating another clip (7) is provided at a position corresponding to the corner on the inner side wall of the anchor ring (6); the number of accommodating spaces of the assembled conical clamp is 2, 3 or more.

9. A recyclable central anchor cable according to claim 1, It is characterized in that A shell base (8) is arranged on the bearing plate (5), the shell base (8) is wrapped around the outer side of the anchor ring (6), and a pre-tightening plate (12) is arranged inside the shell cover, the lower part of the pre-tightening plate (12) abuts against the upper end surface of the clamp to pre-tighten the clamp, and a plurality of first circular holes for the working rope (2) and the recovery rope (3) to pass through are arranged on the pre-tightening plate (12); a plurality of second circular holes for the working rope (2) and the recovery rope (3) to pass through are arranged on the bearing plate (5), and an interface pipe (4) is arranged at the bottom of the second circular hole.

10. A method for using the recoverable central anchor cable according to any one of claims 1 to 9, Features The method comprises the following steps: 1) After the working surface is dug out on the slope of the foundation pit, a downward inclined hole with a certain diameter is first drilled in the soil to a predetermined depth using an anchor bolter, and then the recyclable central anchor cable produced in the factory is placed into the hole together with the grouting pipe, and the cement slurry is filled to the hole mouth through the bottom grouting process; 2) When the cement slurry or other slurry anchoring body reaches the required strength, the working cable (2) is tensioned at the outer end away from the anchor head (1) by a jack; the tension on the working cable (2) is transmitted to the anchor head (1) deep in the soil, and the working cable (2) drives the clamping piece (7) to move together under the action of the tension, and the anchor ring (6) and the central column (9) are further clamped by the clamping piece (7), and the force is transmitted to the bearing plate (5) at the bottom of the anchor head (1), and the bearing plate (5) presses the cement anchoring body in the soil to obtain pull-out resistance; 3) When the anchor cable has completed its tensioning work and is discarded, it can be recovered; first, the recovery cable (3) is pulled out from the outside with a small force, and the locking member (15) retreats toward the center hole, canceling the restriction on the movement of the center column (9) toward the cavity (16). After the center column (9) moves toward the cavity, the lock on the clamp (7) of the working cable (2) is released, and the working cable (2) is recovered.

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