Improved assembly type recycling anchor cable

Abstract

The utility model provides an improved assembly type recoverable anchor cable, including assembly head, spring, clamping structure and mounting cylinder, the assembly head is equipped with mounting cavity, the bottom of mounting cavity is equipped with internal thread fastening hole, the bottom of clamping structure is equipped with external thread fastening head that matches internal thread fastening hole, and the mounting cylinder is equipped with external thread fastening head. A guide structure facilitating alignment of the external thread fastening head and the internal thread fastening hole is arranged at the position, located on the periphery of an opening of the internal thread fastening hole, of the bottom of the installation cavity. Therefore, the external thread fastening head and the internal thread fastening hole can be automatically guided and aligned under the condition of no visual field, the positioning step of the clamping structure is simplified, the trouble of manually adjusting the position by a user is avoided, the anchor cable is more convenient and faster to mount and dismount, in addition, the structural strength is greatly enhanced through the aluminum alloy mounting cylinder, and the service life of the anchor cable is prolonged. And the deformation or damage risk caused by insufficient strength is reduced, so that the service life of the recycled anchor cable is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor cables, in particular to an improved assembled recovery anchor cable. Background Art

[0002] Anchors are devices used for permanent anchoring in prestressed concrete. They are used to maintain the tension of prestressed tendons and transfer it to the interior of concrete. They are also called prestressed anchors. They generate anti-sliding resistance on the sliding surface by anchoring prestressed steel strands in stable rock mass, thereby improving the integrity of the slope rock mass, improving the mechanical properties of the rock mass, controlling the displacement of the rock mass, and promoting its stability.

[0003] In the prior art, in order to solve the problem of anchor cable recovery, there have been studies such as the invention patent with Chinese announcement number CN112411536B, which proposes a detachable assembled recovery anchor cable. The device includes an assembly head, a spring, a clamping structure, a mounting tube, an anchor cable body, a fixing plate and a fastening tube. When in use, first install the spring and the clamping structure into the assembly head, and screw the external threaded fastening head of the clamping structure into the internal threaded hole of the assembly head. Next, install the fastening accessory into the mounting tube and screw the mounting tube into the assembly head. The lower end of the fastening tube passes through the hole of the fixing plate and is connected to the mounting tube. When the fastening tube is screwed in, the elastic plate of the fastening accessory is inserted into the lower end of the fastening tube and is compressed. When fixed, one end of the anchor cable body passes through the protective sleeve, the fastening tube and the mounting tube, and its matching head is inserted into the cavity of the mounting plate. Rotating the anchor cable body drives the clamping structure to rotate, so that the fastening head is disengaged from the internal threaded hole, moves under the action of the spring and clamps the anchor cable body inward, and at the same time, the lower end opens the fastening hoop. When retrieving the anchor cable body, push the anchor cable body inwards to align the fastening head with the internal threaded hole and compress the spring, then rotate the anchor cable body to screw the fastening head into the hole, the clamping structure returns to the installation cavity, and the fastening hoop expands the clip, then the anchor cable body can be pulled out. If the clamping structure is stuck in the fastening fitting, unscrew the fastening cylinder to make the elastic plate come out and rebound, reducing the squeezing force with the clamping structure, and repeat the pressing and rotating action to pull out the anchor cable body.

[0004] Although the above solution is convenient for connecting and disassembling the anchor cable and the anchor cable body, there are still problems in practical application:

[0005] 1. The internal thread fastening hole at the bottom of the assembly head is located in the center of the installation cavity and lacks a transition structure, which makes it difficult to intuitively position the external thread fastening head of the clamping structure when it is pressed into the internal thread fastening hole with the spring. The user needs to manually adjust the position, which makes the whole process complicated.

[0006] 2. The installation tube needs to be rotated to disassemble the anchor cable. As the main force-bearing component, the strength of the installation tube directly affects the service life of the recovery anchor cable. Traditional installation tubes are mostly made of plastic or nylon, which are easily deformed or broken during the rotation and twisting process, thus shortening the service life of the recovery anchor cable.

[0007] In view of this, the inventor has specifically designed an improved assembled recovery anchor cable, and this case is thus generated. Summary of the Utility Model

[0008] In order to solve the above problems, the technical solution of the present utility model is as follows:

[0009] An improved assembled recovery anchor cable, comprising an assembly head, a spring, a clamping structure and an installation cylinder. An installation cavity is provided inside the assembly head. An internal thread fastening hole is provided at the bottom of the installation cavity. An external thread fastening head that cooperates with the internal thread fastening hole is provided at the bottom of the clamping structure. A guiding structure for facilitating the alignment of the external thread fastening head with the internal thread fastening hole is provided on the bottom of the installation cavity and around the opening circumference of the internal thread fastening hole.

[0010] Preferably, the guiding structure is an inclined guiding surface provided around the opening circumference of the internal thread fastening hole. The inclined guiding surface is annularly closed and starts to incline from the opening circumference of the internal thread fastening hole and extends towards the inner side wall of the installation cavity.

[0011] Preferably, the included angle between the cross-section of the inclined guiding surface and the central axis of the recovery anchor cable is 15° - 60°.

[0012] Preferably, the included angle between the cross-section of the inclined guiding surface and the central axis of the recovery anchor cable is 30°.

[0013] Preferably, the guiding structure includes at least two guiding ring surfaces. The outermost guiding ring surface away from the internal thread fastening hole inclines and contracts inward along the inner side wall of the installation cavity. The adjacent guiding ring surfaces continue to incline and contract inward along the inner side of the previous guiding ring surface and form a stepped shape with the previous guiding ring surface. The inner side of the innermost guiding ring surface is inclined and connected to the opening edge of the internal thread fastening hole.

[0014] Preferably, the guiding structure includes two guiding ring surfaces, and the two guiding ring surfaces form a stepped shape along the axial direction of the installation cavity towards the direction of the internal thread fastening hole.

[0015] Preferably, the assembly head includes a connection section, a torsion section and an assembly end arranged in sequence along the same straight line direction. An external thread end is provided at one end of the connection section away from the assembly end. A limiting ring protruding circumferentially around it is provided on one side of the connection section close to the external thread end. An assembly cavity is provided inside the installation cylinder. An assembly interface is formed on one side of the assembly cavity, and an internal thread end that cooperates with the external thread end is formed on the inner side wall of the assembly interface. The assembly interface also has a limiting step that cooperates with the limiting ring.

[0016] Preferably, the torsion section is hexagonal star-shaped, and the corners of the hexagonal star are in an arc transition.

[0017] Preferably, the assembly end is columnar and its cross-section is a regular hexagon.

[0018] Preferably, the mounting cylinder is an aluminum alloy mounting cylinder.

[0019] The beneficial effects of the present utility model are as follows:

[0020] By providing a guiding structure between the installation cavity and the internal thread fastening hole, the present utility model facilitates the automatic guiding and alignment of the external thread fastening head and the internal thread fastening hole in the absence of visibility, simplifies the positioning steps of the clamping structure, avoids the trouble of manual position adjustment by the user, and makes the installation and disassembly processes of the anchor cable more convenient and fast.

[0021] In addition, by setting the mounting cylinder as an aluminum alloy mounting cylinder, the present utility model greatly enhances the strength of the mounting cylinder, reduces the risk of deformation or damage due to insufficient strength, and thus extends the service life of the recycled anchor cable.

[0022] In addition, the design of multi-segment guiding can not only achieve the smooth alignment of the external thread fastening head and the internal thread fastening hole, but also segment the inclined guiding ring surface, avoiding the over-large inclination angle of a single guiding ring surface due to a large height difference, so that the external thread fastening head can smoothly obtain guiding and positioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present utility model, form a part of the present utility model, and the schematic embodiments and descriptions thereof are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0024] Among them:

[0025] Figure 1 is a three-dimensional structural schematic diagram of Embodiment 1 of the present utility model;

[0026] Figure 2 is an overall structural schematic diagram of Embodiment 1 of the present utility model;

[0027] Figure 3 is a partial cross-sectional structural schematic diagram of Embodiment 1 of the present utility model;

[0028] Figure 4 is a partial cross-sectional and exploded structural schematic diagram of Embodiment 1 of the present utility model;

[0029] Figure 5 is a three-dimensional structural schematic diagram highlighting the clamping structure in Embodiment 1 of the present utility model;

[0030] Figure 6 is a top-view structural schematic diagram highlighting the torsion section in Embodiment 1 of the present utility model;

[0031] Figure 7 It is a partial sectional structure schematic diagram of the second embodiment of the present utility model.

[0032] Label description:

[0033] 10. Assembly head; 11. Installation cavity; 12. Internal thread fastening hole; 13. Connection section; 14. Torsion section; 15. Assembly end; 16. External thread end; 17. Limit ring; 20. Spring; 30. Clamping structure; 31. External thread fastening head; 311. Chamfer; 32. Mounting seat; 33. Mounting disc; 34. Clip; 341. Clamping cavity; 342. Thread groove; 35. Fastener; 40. Installation cylinder; 41. Assembly cavity; 411. Assembly interface; 42. Internal thread end; 43. Limit step; 44. Installation groove; 50. Guiding structure; 51. Inclined guiding surface; 52. Guiding ring surface; 60. Limit sleeve; 61. Protrusion; 62. Insertion through hole; 621. Insertion section; 622. Tapered section. Specific implementation manners

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. Embodiment

[0035] Please refer to Figures 1 to 6 , which is an improved assembled recovery anchor cable as the best embodiment of the present utility model, including an assembly head 10, a spring 20, a clamping structure 30 and an installation cylinder 40. An installation cavity 11 is provided inside the assembly head 10, an internal thread fastening hole 12 is provided at the bottom of the installation cavity 11, an external thread fastening head 31 matching with the internal thread fastening hole 12 is provided at the bottom of the clamping structure 30, and a guiding structure 50 for facilitating the alignment of the external thread fastening head 31 and the internal thread fastening hole 12 is provided at the bottom of the installation cavity 11 and on the circumferential side of the opening of the internal thread fastening hole 12.

[0036] Specifically, in this embodiment, the external structure of the recovery cable anchor from top to bottom sequentially includes an assembly head 10 and an installation cylinder 40. The assembly head 10 includes a connection section 13, a torsion section 14, and an assembly end 15 arranged in sequence along the same straight line direction. The connection section 13 is cylindrical. One end of the connection section 13 away from the assembly end 15 is provided with an external thread end 16. One side of the connection section 13 close to the external thread end 16 is provided with a limiting ring 17 protruding around its circumference. The installation cylinder 40 is cylindrical, and its inner side is provided with an assembly cavity 41. One side of the assembly cavity 41 forms an assembly interface 411, and the inner side wall of the assembly interface 411 forms an internal thread end 42 that cooperates with the external thread end 16. The assembly interface 411 is also provided with a limiting step 43 that cooperates with the limiting ring 17. During installation, the internal thread end 42 of the installation cylinder 40 is aligned with the external thread end 16 of the assembly head 10 and screwed in until the limiting ring 17 abuts against the limiting step 43, completing the connection and fixation of the installation cylinder 40 and the assembly head 10.

[0037] In addition, a limiting sleeve 60 that is integrally cylindrical is also provided inside the installation cylinder 40. An installation groove 44 communicating with the outside is opened on one side of the assembly cavity 41 away from the assembly interface 411. The limiting sleeve 60 is in clearance fit with the assembly cavity 41, and one end protruding along its axis is provided with a protruding portion 61 that is in clearance fit with the installation groove 44. The limiting sleeve 60 is axially penetrated with a plugging through hole 62 for the cable anchor body to be inserted. The upper end of the plugging through hole 62 communicates with the installation cavity 11 of the assembly head 10. The diameter of the installation groove 44 is smaller than the inner diameter of the assembly cavity 41, thus forming a stepped stop structure. When the protruding portion 61 of the limiting sleeve 60 penetrates into the assembly cavity 41, its protruding portion 61 sequentially passes through the installation groove 44 along the assembly cavity 41, forming a protruding structure protruding from the bottom surface of the installation cylinder 40 at the bottom of the installation cylinder 40. The plugging through hole 62 inside it connects the installation cavity 11, so that the cable anchor body can directly penetrate into the installation cavity 11 after being inserted.

[0038] In order to fix the anchor cable body, the clamping structure 30 includes a mounting base 32, a mounting disc 33, clamping pieces 34 and a fastener 35. The external-thread fastening head 31 extends integrally from the center of the end face of the mounting base 32 towards one side, and a chamfer 311 is provided at its end to facilitate screwing into the internal-thread fastening hole 12. External threads and internal threads are respectively provided on it and the internal-thread fastening hole 12, so as to achieve threaded connection. The mounting disc 33 is integrally provided on the side of the mounting base 32 away from the external-thread fastening head 31, and an annular groove (not marked in the figure) is provided at the outer edge of its bottom. There are 3 clamping pieces 34 in total, and they are clamped and installed around the circumferential side of the mounting disc 33. Specifically, the clamping pieces 34 are in the shape of a tapered arc plate structure. A clamping groove (not marked in the figure) that is in clamping fit with the groove is provided at the inner bottom of each group of clamping pieces 34. An arc-shaped mating groove (not marked in the figure) is provided at the outer bottom of the clamping pieces 34. The arc-shaped mating grooves of the three clamping pieces 34 are sequentially connected to enclose a circular annular mating groove (not marked in the figure). The fastener 35 is an O-shaped rubber ring. By placing the O-shaped rubber ring in the annular mating groove, the purpose of converging the three clamping pieces 34 on the circumferential side of the mounting disc 33 is achieved. The middle parts of the three clamping pieces 34 enclose a clamping cavity 341 for the anchor cable body to pass through. When the three clamping pieces 34 are in an open state, the inner diameter of the clamping cavity 341 is larger than that of the anchor cable body to facilitate the penetration of the anchor cable body.

[0039] In addition, in order to cooperate with the opening and contraction of the clamping pieces 34 to realize the clamping and loosening of the anchor cable body, the insertion through hole 62 inside the limit sleeve 60 is divided into an insertion section 621 and a tapered section 622 from bottom to top in sequence. The insertion section 621 is located at the lower end (i.e., the end communicating with the external environment), and the tapered section 622 presents a shape adapted to the taper formed by the enclosure of the three clamping pieces 34 and is located above the insertion section 621. When the whole clamping structure 30 is pressed towards the mounting cylinder 40, the three clamping pieces 34 enter the tapered section 622. When the clamping pieces 34 contact the inner wall of the tapered section 622, the three clamping pieces 34 swing inwards simultaneously to realize contraction, so that the inner sides of the clamping pieces 34 are tightly pressed against the outer surface of the anchor cable body, realizing the clamping of the anchor cable body.

[0040] In order to realize the movement of the clamping structure 30 towards the mounting cylinder 40, the spring 20 is installed between the clamping structure 30 and the internal-thread fastening hole 12 of the assembly head 10. The spring 20 is sleeved on the outer circumferential side of the external-thread fastening head 31, and its two ends are respectively in movable contact with the inner top of the mounting cavity 11 and the mounting disc 33. Thus, through the elastic force of the spring 20, the clamping structure 30 can have a tendency to move towards the mounting cylinder 40, so as to push the multiple clamping pieces 34 into the tapered section 622 and keep it in a clamped state of the anchor cable body.

[0041] In order to further clamp and fix the anchor cable body, a number of threaded grooves 342 are provided on the inner side wall of the clamping cavity 341, that is, the upper end of the inner side wall of the wedge 34. Thus, when the wedge 34 is clamped and contracted by the limit sleeve 60 and clamped on the outer wall of the anchor cable body, the threaded grooves 342 can further increase the surface roughness, thereby further enhancing the clamping friction force of the wedge 34 on the anchor cable body.

[0042] The working process of this embodiment is as follows: First, insert the external thread fastening head 31 of the clamping structure 30 into the middle of the spring 20, and then place the clamping structure 30 and the spring 20 together into the installation cavity 11. Press the clamping structure 30 to compress the spring 20 and at the same time move the external thread fastening head 31 of the clamping structure 30 towards the internal thread fastening hole 12 close to the bottom of the installation cavity 11. When the external thread fastening head 31 is aligned with the internal thread fastening hole 12, rotate the clamping structure 30 to screw the external thread fastening head 31 into the internal thread fastening hole 12. At this time, the clamping structure 30 is on the side close to the internal thread fastening hole 12. The inner diameter of the inner side wall of the installation cavity 11 enables the three wedges 34 to be in an open state, facilitating the insertion of the anchor cable body. Subsequently, insert the protruding part of the limit sleeve 60 into the assembly interface 411 side of the installation cylinder 40, so that the protruding part is in limit fit with the installation groove 44. Then, thread-connect the internal thread end 42 inside the assembly interface 411 of the installation cylinder 40 with the external thread end 16 on the connection section 13 of the assembly head 10, and press the limit sleeve 60 into the installation cylinder 40 through the connection section 13. At this time, the three wedges 34 are in a position away from the limit sleeve 60. This state is the initial state for installing the anchor cable body. After the anchor cable body is inserted, it sequentially passes through the insertion through-hole 62 into the installation cavity 11 and is inserted into the clamping cavity 341 between the three wedges 34. Press and retract the entire anchor cable, and then rotate it. At this time, under the action of the friction force, the clamping structure 30 is tightened and in a relatively fixed state, while the assembly head 10, the installation cylinder 40, and the limit sleeve 60 rotate relative to the clamping structure 30, so as to screw the external thread fastening head 31 out of the internal thread fastening hole 12. Under the action of the spring 20, the clamping structure 30 is pushed towards the installation cylinder 40, so that the three wedges 34 and the anchor cable body are together pushed (the retracted anchor cable moves relative to the anchor cable body) into the tapered section 622 of the limit sleeve 60, forcing the three wedges 34 to contract and press tightly on the outer side wall of the anchor cable body, completing the clamping and fixing of the anchor cable body. At this time, if you want to pull the anchor cable body outwards, it will drive the wedges 34 to move together, and the anchor cable body is firmly limited in the retracted anchor cable through the limit between the wedges 34 and the tapered section 622 and the friction force between the inner side of the wedges 34 and the anchor cable body.

[0043] Conversely, if you want to remove the recovery anchor cable, you need to press down on the entire recovery anchor cable forcefully, so that the anchor cable body pushes the clamping structure 30 inside it out of the conical section 622 again and into the installation cavity 11. The three clamping pieces 34 that lose their limit spread out again, releasing the clamping effect on the outer wall of the anchor cable body. At this time, the external thread fastening head 31 at the upper end of the clamping structure 30 is re-aligned with the internal thread fastening hole 12 at the bottom of the installation cavity 11. Rotate the entire recovery anchor cable so that the external thread fastening head 31 is screwed into the internal thread fastening hole 12 again, achieving the purpose of positioning the clamping structure 30 in the installation cavity 11. At this time, the spring 20 is also in a compressed state. Move the entire recovery anchor cable outward, and the anchor cable body can be directly pulled out.

[0044] Specifically, the guiding structure 50 is an inclined guiding surface 51 arranged around the opening circumference of the internal thread fastening hole 12. The inclined guiding surface 51 is annular and closed and starts to incline along the opening circumference of the internal thread fastening hole 12 and extends towards the inner side wall of the installation cavity 11.

[0045] Preferably, the included angle α between the cross-section of the inclined guiding surface 51 and the central axis of the recovery anchor cable is 15° - 60°.

[0046] Preferably, the included angle α between the cross-section of the inclined guiding surface 51 and the central axis of the recovery anchor cable is 30°.

[0047] In this embodiment, through the setting of a single inclined guiding surface 51, it is convenient for the external thread fastening head 31 to slide directly along the inclined guiding surface 51 to the position of the internal thread fastening hole 12, facilitating the positioning of the external thread fastening head 31 and facilitating the locking and fixing of the clamping structure 30, and cooperating to realize the insertion and extraction of the anchor cable body.

[0048] Preferably, the torsion section 14 is hexagonal star-shaped, and the corners of the hexagonal star are arc-shaped transitions. Through the hexagonal star-shaped torsion section 14, it is convenient for users to apply force to the assembly head 10, thereby cooperating to realize the rotation or fixing operation.

[0049] Preferably, the assembly end 15 is columnar and its cross-section is regular hexagon-shaped. As a regular hexagon shape, the assembly end 15 can cooperate with an internal hexagon tool to further facilitate the rotation or fixing operation of the entire recovery anchor cable.

[0050] Preferably, the installation cylinder 40 is an aluminum alloy installation cylinder 40. In the present utility model, by setting the installation cylinder 40 as an aluminum alloy installation cylinder 40, the strength of the installation cylinder 40 is greatly enhanced, reducing the risk of deformation or damage due to insufficient strength, thereby extending the service life of the recovery anchor cable. Embodiment

[0051] Please refer to Figure 7, is an improved assembled recovery anchor cable as embodiment 2 of the utility model, which is different from embodiment 1 in that the guide structure 50 includes at least two guide ring surfaces 52, and the structure of the guide ring surface 52 is the same as the inclined guide surface 51 in embodiment 1 except for the inclination angle. The outermost guide ring surface 52 located away from the internal thread fastening hole 12 is inclined and contracted inwardly along the inner wall of the installation cavity 11, and the adjacent guide ring surfaces 52 continue to be inclined and contracted inwardly along the inner side of the previous guide ring surface 52 and form a step shape with the previous guide ring surface 52, and the inner side of the innermost guide ring surface 52 is obliquely connected to the opening edge of the internal thread fastening hole 12.

[0052] Preferably, the guide structure 50 includes two guide annular surfaces 52 , and the two guide annular surfaces 52 are stepped along the axial direction of the installation cavity 11 toward the internal thread fastening hole 12 .

[0053] Thus, through the double-layer stepped guide ring surface 52, the external threaded fastening head 31 and the internal threaded fastening hole 12 can be smoothly aligned, and the inclined guide ring surface 52 can be segmented to avoid excessive inclination of a single guide ring surface 52 due to a large height difference, so that the external threaded fastening head 31 can be smoothly guided and positioned.

[0054] The beneficial effects of the utility model are as follows:

[0055] The utility model sets a guide structure 50 between the installation cavity 11 and the internal thread fastening hole 12, thereby facilitating automatic guidance and alignment of the external thread fastening head 31 and the internal thread fastening hole 12 without vision, simplifying the positioning steps of the clamping structure 30, avoiding the trouble of manual position adjustment by the user, and making the installation and disassembly process of the anchor cable more convenient and quick.

[0056] In addition, the utility model greatly enhances the strength of the mounting tube 40 by configuring the mounting tube 40 to be an aluminum alloy mounting tube 40 , reduces the risk of deformation or damage due to insufficient strength, and thus prolongs the service life of the recovery anchor cable.

[0057] In addition, the multi-segment guide design can not only realize the smooth alignment of the external thread fastening head 31 and the internal thread fastening hole 12, but also divide the inclined guide ring surface 52 into segments to avoid excessive inclination of a single guide ring surface 52 due to a large height difference, thereby allowing the external thread fastening head 31 to obtain guided positioning smoothly.

[0058] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. An improved assembled recovery anchor cable, comprising an assembly head (10), a spring (20), a clamping structure (30) and an installation cylinder (40). An installation cavity (11) is provided inside the assembly head (10), and an internal thread fastening hole (12) is provided at the bottom of the installation cavity (11). An external thread fastening head (31) that mates with the internal thread fastening hole (12) is provided at the bottom of the clamping structure (30), characterized in that, A guiding structure (50) facilitating the alignment of the external thread fastening head (31) with the internal thread fastening hole (12) is provided at the bottom of the installation cavity (11) and on the circumferential side of the opening of the internal thread fastening hole (12).

2. The improved prefabricated recovery anchor cable according to claim 1, characterized in that, The guiding structure (50) is an inclined guiding surface (51) arranged around the circumferential side of the opening of the internal thread fastening hole (12). The inclined guiding surface (51) is annularly closed and starts to incline from the circumferential side of the opening of the internal thread fastening hole (12) and extends towards the inner side wall of the installation cavity (11).

3. An improved prefabricated recovery anchor cable according to claim 2, characterized in that, The included angle between the cross-section of the inclined guiding surface (51) and the central axis of the recovery cable anchor is 15° - 60°.

4. An improved prefabricated recovery anchor cable according to claim 3, characterized in that, The included angle between the cross-section of the inclined guiding surface (51) and the central axis of the recovery cable anchor is 30°.

5. An improved prefabricated recovery anchor cable according to claim 1, characterized in that, The guiding structure (50) includes at least two guiding ring surfaces (52). The outermost guiding ring surface (52) away from the internal thread fastening hole (12) inclines and contracts inwards along the inner side wall of the installation cavity (11). The adjacent guiding ring surfaces (52) continue to incline and contract inwards along the inner side of the previous guiding ring surface (52) and form a stepped shape with the previous guiding ring surface (52). The inner side of the innermost guiding ring surface (52) is inclined and connected to the opening edge of the internal thread fastening hole (12).

6. An improved prefabricated recovery anchor cable according to claim 5, characterized in that, The guiding structure (50) includes two guiding ring surfaces (52), and the two guiding ring surfaces (52) form a stepped shape along the axial direction of the installation cavity (11) towards the direction of the internal thread fastening hole (12).

7. An improved prefabricated recycled anchor cable according to claim 1, characterized in that, The assembly head (10) includes a connection section (13), a torsion section (14), and an assembly end (15) arranged in sequence along the same straight line direction. An external thread end (16) is provided at one end of the connection section (13) away from the assembly end (15). A limiting ring (17) protruding around its circumference is provided on one side of the connection section (13) close to the external thread end (16). An assembly cavity (41) is provided inside the installation cylinder (40). An assembly interface (411) is formed on one side of the assembly cavity (41), and an internal thread end (42) matching the external thread end (16) is formed on the inner side wall of the assembly interface (411). The assembly interface (411) is also provided with a limiting step (43) matching the limiting ring (17).

8. An improved prefabricated recovery anchor cable according to claim 7, characterized in that, The torsion section (14) is in the shape of a six-pointed star, and the corners of the six-pointed star are in an arc transition.

9. An improved prefabricated recovery anchor cable according to claim 7, characterized in that, The assembly end (15) is columnar and its cross-section is a regular hexagon.

10. An improved prefabricated recycled anchor cable according to any one of claims 1-9, characterized in that, The installation cylinder (40) is an aluminum alloy installation cylinder (40).

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