Shear unlocking type recyclable prestressed anchor cable and construction process thereof

Abstract

The application discloses a shearing unlocking type recyclable prestressed anchor cable and a construction process thereof, which comprises a protection side shell arranged in a circular tube structure, the bottom end of the protection side shell is installed with a protection bottom shell, a limiting groove is arranged in the protection bottom shell, the top end of the limiting groove is flush with the bottom end of a positioning plate, and the positioning plate is fixed by three positioning bolts; a bearing table in the protection side shell is installed in a vertical direction with the limiting plate, a circular table groove in the bearing table is provided with a stable installation of a conical clamp arranged in an annular equidistant manner, the circular table groove of the bearing table is matched with a limiting ring to shrink the conical clamp, and the conical clamp is a three-petal structure to conveniently shrink the steel strands with different diameters. The application further provides the construction process of the above-mentioned rotating unlocking type recyclable prestressed anchor cable, and has the advantages of simple structure, convenient installation on a construction site, simultaneous recycling of multiple steel strands, great economy, operability and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of anchor cable technology, specifically to a shear-unlocking recyclable prestressed anchor cable and its construction process. Background Technology

[0002] With the rapid development of my country's economy and the continuous expansion of building scale, building heights are constantly being refreshed. Due to the scarcity of land resources, people's awareness of utilizing underground space is gradually increasing. Common underground engineering projects include subways, underground shopping malls, and underground integrated pipe corridors. During the construction of underground projects, the installation of support structures must be considered. Prestressed anchor cable reinforcement is an important temporary support method for building foundation pits, often used in foundation pit projects with high safety requirements or large scale. However, this type of prestressed anchor cable support structure no longer provides support after the main structure of the building is completed and is often unrecoverable. Traditional permanent anchor cables cannot be recycled and reused in a timely manner, leading to the rise of recyclable anchor cables, which effectively overcome the shortcomings of traditional anchor cables. For example:

[0003] For example, in the publication number "CN108867637B An anchor for a recyclable anchor cable and its locking method and a method for recycling the anchor cable", the anchor cable is rotated clockwise, which drives the connecting shaft to rotate. The connecting shaft drives the connecting screw to rotate clockwise relative to the guide housing. The connecting screw gradually moves away from the cone sleeve, and the spring's thrust on the connecting shaft and the jaws gradually weakens. As a result, the pressure of the cone sleeve on the jaws weakens, and the jaws gradually loosen their locking force on the anchor cable. Then, when the connecting screw continues to move backward to a limit point, it pulls the connecting shaft and the jaws to move away from the cone sleeve. The pressure of the cone sleeve on the jaws disappears, and the clamping force of the jaws on the anchor cable disappears. Finally, the anchor cable can be pulled out and recycled. This not only solves the pollution problem of underground space, but also saves a lot of engineering support costs.

[0004] However, there are many types of existing recyclable anchor cables, most of which use relatively complex recyclable structures. This not only results in a large waste of steel strands, but also creates construction waste that encroaches on underground space, causing serious underground pollution. The anchor cables left underground will also cause many problems for the future development of adjacent spaces. In addition, the technology in the aforementioned publication also has some defects. In the process of locking or unlocking the anchor cable by rotating it, the high tensile strength of the steel strands is ignored. Due to their low stiffness, it is difficult to unlock the anchor cable by rotating it in actual engineering, which increases the difficulty of recycling the anchor cable.

[0005] To address the aforementioned issues, there is an urgent need for innovative designs based on existing anchor cable devices. Summary of the Invention

[0006] The purpose of this invention is to provide a shear-unlocking recyclable prestressed anchor cable and its construction process, in order to solve the problems mentioned in the background art, such as the complex internal recyclable structure of existing anchor cables, which leads to a large waste of steel strands and the formation of construction waste that encroaches on underground space, causing serious underground pollution. In the process of locking or unlocking the anchor cable by rotating the anchor cable, the high tensile strength of the steel strands and their low stiffness increase the difficulty of recycling the anchor cable.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a shear-unlocking recyclable prestressed anchor cable and its construction process, comprising a protective side shell, which is configured as a cylindrical structure, the bottom end of the protective side shell is installed with a protective bottom shell, and a limiting groove is provided inside the protective bottom shell, the top end of the limiting groove is flush with the bottom end of the positioning plate, and three positioning bolts are symmetrically connected to the side wall of the positioning plate, the positioning bolts are installed vertically on both sides of the surface of the protective side shell, and the cross-section of the protective side shell and the protective bottom shell is configured as a U-shaped structure, the bottom end of the protective side shell is provided with a groove that engages with the top end of the protective bottom shell, and the bottom end of the protective bottom shell is configured as an arc-shaped structure, and a limiting groove is provided inside the protective bottom shell;

[0008] A protective plate is installed on the upper end of the protective side shell. The side wall of the protective plate is threadedly connected to two positioning bolts, and the inside of the protective plate is provided with a hole through which the anti-slip sleeve penetrates. The center of the hole in the protective plate is aligned with the center of the hole inside the bearing platform and the conical clamp.

[0009] The above technical solution facilitates the rapid extraction and recovery of anchor cables, preventing steel strands from accumulating at the bottom of the building construction site.

[0010] Preferably, the positioning plate, the limiting cavity, and the bearing platform are arranged vertically upwards inside the protective side shell, and the positioning plate, the limiting cavity, and the bearing platform are internally threaded with limiting screw sleeves.

[0011] By adopting the above technical solution, the positioning plate, the limiting cavity, and the bearing platform provide a stable installation for the limiting screw sleeve at the installation position.

[0012] Preferably, a second limiting screw sleeve is arranged parallel to one side of the first limiting screw sleeve, and a third limiting screw sleeve is arranged parallel to one side of the second limiting screw sleeve. The bottom ends of the third limiting screw sleeve, the second limiting screw sleeve, and the first limiting screw sleeve are connected inside the limiting groove. The internal holes of the first limiting screw sleeve, the second limiting screw sleeve, and the third limiting screw sleeve are all configured to have an opening structure that fits the outer contour of the steel strand.

[0013] Using the above technical solution, the three steel strands are kept tightly connected by the cooperation of the first limiting screw sleeve, the second limiting screw sleeve and the third limiting screw sleeve.

[0014] Preferably, the support platform is penetrated by a limiting bolt, and the bottom end of the support platform is installed on the upper end of the limiting cavity. The support platform has three frustum grooves arranged in a ring shape inside, and a conical clamp is installed inside the frustum grooves of the support platform.

[0015] Using the above technical solution, the tapered clamp is encased inside the support platform for stable installation.

[0016] Preferably, both the support platform and the conical clamp are three-lobed ring-shaped splicing structures, and the inner wall of the conical clamp is provided with a support spring, and the upper outer wall of the conical clamp is sleeved with the limiting ring.

[0017] With the above technical solution, the three-lobed structure of the bearing platform and the conical clamp facilitates the installation of the steel strand inside.

[0018] Preferably, the limiting ring is located inside the frustum groove inside the bearing platform, and the center of the limiting ring is aligned with the center of the conical clamp, and the bottom end of the steel strand penetrates the inside of the conical clamp, while the upper end of the steel strand penetrates the inside of the sleeve.

[0019] Using the above technical solution, the tapered clamp maintains a stable installation effect for the steel strand.

[0020] Preferably, the sleeve is composed of three central pipes connected by a steel rod, and the sleeve is placed on the upper end of the anti-slip sleeve. The upper end of the anti-slip sleeve is engaged with the upper end of the limiting bolt, and the limiting bolt passes through the threaded ring located inside the protective plate.

[0021] Using the above technical solution, a stable installation environment is provided for the three steel strands through the sleeve.

[0022] Preferably, the steel strand passes through the inside of the support platform and the limiting plate, and the bottom end of the limiting plate is provided with a groove that engages with the support platform, and the side walls of the support platform and the limiting plate are threadedly connected to the positioning bolts.

[0023] By adopting the above technical solution, the three-lobed structure of the support platform is kept stably connected by the limiting plate to prevent the steel strands from falling off.

[0024] Preferably, the steel strand passes through the inside of the anti-slip sleeve, and the bottom end of the anti-slip sleeve passes through the inside of the buffer ring, and the buffer ring is located at the upper end of the limiting plate, and the top end of the buffer ring is engaged with the bottom end of the protective plate.

[0025] By adopting the above technical solution, the anti-slip sleeve is wrapped around the surface of the steel strand to prevent the steel strand from being dragged and to maintain stability.

[0026] Preferably, in step one: the tensioning and locking of the steel strands is performed by sequentially passing each steel strand through the protective plate, the limiting plate, the bearing platform, and the conical clamp until the bottom of the limiting screw sleeve one, the limiting screw sleeve two, and the limiting screw sleeve three. The steel strands are rotated counterclockwise until they can no longer be rotated, so that the conical clamp is tightly attached to the steel strands, and the tensioning operation can be carried out.

[0027] Step Two: Unlocking and Retrieving the Steel Strand. After construction, during the retrieval operation, continue tensioning based on the designed pull-out force until the positioning bolts around the limiting plate and bearing platform are sheared. Simultaneously, the buffer ring is compressed, achieving the purpose of unlocking the limiting plate and bearing platform by moving towards the protective plate. On the other hand, the buffer ring buffers the impact force towards the protective plate after the positioning bolts around the limiting plate and bearing platform are sheared, preventing the positioning bolts around the protective plate from shearing. The limiting plate and bearing platform slide towards the reserved space on the protective side shell and the protective bottom shell. Then, the applied tension is released. Under the combined action of gravity and the buffer ring, the limiting plate and bearing platform move towards the protective bottom shell. The bearing platform is no longer restricted by the positioning bolts, and a gap is created between the limiting plate and the bearing platform. The support spring on the conical clamp will play its role, causing the conical clamp to relax and fall off to the limiting screw sleeves one, two, and three, completing the unlocking of the lock. At this point, the anchor cable unlocking construction is completed, and the steel strand can be manually pulled out to complete the retrieval.

[0028] The above technical solution facilitates the rapid extraction and recycling of steel strands, reducing waste.

[0029] Compared with the prior art, the beneficial effects of the present invention are: the shear-unlocking recyclable prestressed anchor cable and its construction process:

[0030] 1. When using this device, the support platform and the limiting plate are installed vertically. The conical clamps with equidistant conical grooves in the circular shape inside the support platform provide stable installation. The conical grooves on the support platform cooperate with the limiting ring to tighten the upper surface of the conical clamps. By placing the bottom end of the support platform above the limiting screw sleeves one, two, and three, the bottom end of the steel strand is limited. As the support platform, the limiting screw sleeves, and the connecting plate are installed in a coordinated manner, the conical clamps are lifted, causing the conical clamps to be limited and contracted by the external space, thereby maintaining a tight internal connection. After the anchor cable is pulled out from the construction area, the steel strands can be quickly removed and recycled, avoiding the steel strands remaining at the bottom of the building and causing pollution during underground construction.

[0031] 2. Since the protective side shell and the protective bottom shell form a stable installation structure, the protective bottom shell and the protective side shell are tightly connected during use. As the steel strands of the limiting screw sleeve one, limiting screw sleeve two and limiting screw sleeve three rotate, the positioning bolt rotates upward and lifts, so that the conical clamp holds the internal steel strands, and the limiting grooves inside the protective side shell and the protective bottom shell are connected to the positioning plate and the limiting screw sleeve.

[0032] As the steel strand drives the limiting sleeve to rotate, the distance between the limiting sleeve and the positioning plate is increased. The limiting sleeve enters the protective bottom shell, locking the steel strand and achieving the purpose of anchoring. After construction is completed, a pull-out force is applied to shear the positioning bolt, separating the bearing platform from the limiting plate. The three-lobed structure of the bearing platform opens, allowing the conical clamp to open under the action of the support spring. Combined with the shearing force of the rotating steel strand, the internal connecting structure is loosened, making the internal structure easy to separate and facilitate the separation and recycling of the steel strand. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0034] Figure 2 This is a schematic diagram of the overall internal side section structure of the present invention;

[0035] Figure 3 This is a side sectional view of the installation structure of the support platform and the limiting bolts of the present invention;

[0036] Figure 4 This is a schematic diagram of the three-dimensional structure of the limiting screw sleeve 2 and the support platform of the present invention;

[0037] Figure 5 This is a three-dimensional structural diagram of the conical clamp and steel strand installation of the present invention;

[0038] Figure 6 This is a schematic diagram of the overall disassembled three-dimensional structure of the present invention.

[0039] In the diagram: 1. Protective side shell; 2. Protective bottom shell; 3. Limiting groove; 4. Positioning plate; 5. Positioning bolt; 6. Limiting cavity; 7. Limiting screw sleeve one; 8. Limiting screw sleeve two; 9. Limiting screw sleeve three; 10. Limiting bolt; 11. Bearing platform; 12. Conical clamp; 13. Support spring; 14. Limiting ring; 15. Limiting plate; 16. Anti-slip sleeve; 17. Buffer ring; 18. Threaded ring; 19. Sleeve; 20. Steel strand; 21. Protective plate. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figure 1-6 The present invention provides a technical solution: a shear-unlocking recyclable prestressed anchor cable; Example

[0042] This embodiment discloses: a protective side shell 1, a protective bottom shell 2, a limiting groove 3, a positioning plate 4, a positioning bolt 5, a limiting cavity 6, a first limiting screw sleeve 7, a second limiting screw sleeve 8, a third limiting screw sleeve 9, a limiting bolt 10, and a support platform 11. The protective side shell 1 is configured as a cylindrical structure. The bottom end of the protective side shell 1 is installed with the protective bottom shell 2, and the protective bottom shell 2 has a limiting groove 3 inside. The top end of the limiting groove 3 is flush with the bottom end of the positioning plate 4, and three positioning bolts 5 are symmetrically connected to the side wall of the positioning plate 4. The positioning bolts 5 are installed vertically on both sides of the surface of the protective side shell 1, and the cross-section of the protective side shell 1 and the protective bottom shell 2 is configured as a U-shaped structure. The bottom end of the protective side shell 1 is provided with a groove that engages with the top end of the protective bottom shell 2, and the bottom end of the protective bottom shell 2 is configured as an arc-shaped structure. The protective bottom shell 2 has a limiting groove 3 inside, and the positioning plate 4... The limiting cavity 6 and the bearing platform 11 are located inside the protective side shell 1 and are arranged vertically upwards. The positioning plate 4, the limiting cavity 6 and the bearing platform 11 are internally threaded with limiting screw sleeves 1 7, 2 8 and 3 9. Limiting screw sleeve 2 8 is arranged parallel to one side of limiting screw sleeve 1 7 and limiting screw sleeve 3 9 is arranged parallel to one side of limiting screw sleeve 2 8. The bottom ends of limiting screw sleeve 3 9, limiting screw sleeve 2 8 and limiting screw sleeve 1 7 are connected inside the limiting groove 3. The internal holes of limiting screw sleeve 1 7, limiting screw sleeve 2 8 and limiting screw sleeve 3 9 are all designed to fit the outer contour of the steel strand 20. The bearing platform 11 is penetrated by the limiting bolt 10 and the bottom end of the bearing platform 11 is installed on the upper end of the limiting cavity 6. The bearing platform 11 has 3 frustum grooves arranged in a ring inside and a conical clamp 12 is installed inside the frustum grooves of the bearing platform 11.

[0043] Referring to the attached diagrams in the instruction manual Figure 1-6 As shown, the protective side shell 1 and the protective bottom shell 2 are joined in a U-shape, as... Figure 1 As shown, during use, the inner wall thread of the protective bottom shell 2 is tightly connected to the limiting groove 3. With the limiting groove 3 flush with the bottom end of the protective side shell 1, the groove located at the bottom end of the protective side shell 1 is tightly connected to the connection point of the protective bottom shell 2. During use, the positioning plate 4 and the limiting cavity 6 are... Figure 2As shown, the threaded grooves located inside the positioning plate 4 and the limiting cavity 6 are tightly connected to the limiting screw sleeve 7, the limiting screw sleeve 8, and the limiting screw sleeve 9. The limiting screw sleeve 7, together with the limiting screw sleeve 8 and the limiting screw sleeve 9, are connected through an internal opening that fits with the outer contour of the steel strand 20. Figure 2 As shown, the limiting screw sleeve 7, together with the limiting screw sleeve 8 and the limiting screw sleeve 9, limits the steel strand 20. The positioning plate 4 located at the bottom of the limiting screw sleeve 7, the limiting screw sleeve 8, and the limiting screw sleeve 9 maintains vertical stability with the limiting bolt 10. The limiting bolt 10 passes through the bearing platform 11, the limiting plate 15, and the protective plate 21 to maintain stability. In use, the positioning plate 4, the limiting cavity 6, and the bearing platform 11 are placed inside the protective side shell 1 from bottom to top. Figure 2 As shown, during use, the limiting screw sleeve 7 is installed inside the positioning plate 4 along with the limiting screw sleeve 8 and the steel strand 20. The bottom end of the steel strand 20 contacts the positioning plate 4, thus pushing the positioning plate 4 and causing the limiting screw sleeve 7 to rotate. This allows the limiting screw sleeve 7 to rotate within the positioning plate 4 and the limiting cavity 6. As the bottom thread of the limiting screw sleeve 7 is stably connected to the limiting groove 3, it rises, maintaining a tight connection between the protective side shell 1 and the protective bottom shell 2. Figure 2 and Figure 4-5 As shown, the frustum-shaped groove inside the support platform 11 simultaneously allows the three conical clamps 12 to be lifted upwards for a tight fit, as... Figure 4-5 As shown, this facilitates the docking of the support platform 11 and the conical clamp 12; Example

[0044] This embodiment, based on Embodiment 1, discloses the following components: a conical clamp 12, a support spring 13, a limiting ring 14, a limiting plate 15, an anti-slip sleeve 16, a buffer ring 17, a threaded ring 18, a sleeve 19, a steel strand 20, and a protective plate 21. The protective plate 21 is installed on the upper end of the protective side shell 1. The side wall of the protective plate 21 is threadedly connected to three positioning bolts 5. The protective plate 21 has a hole through which the anti-slip sleeve 16 penetrates. The hole in the protective plate 21 is aligned with the center of the holes in the support platform 11 and the conical clamp 12. The steel strand 20 penetrates the support platform 11 and the limiting plate 15. The bottom end of the limiting plate 15 has a groove for engaging with the support platform 11. The side walls of the support platform 11 and the limiting plate 15 are threadedly connected to the positioning bolts 5. The steel strand 20 penetrates the anti-slip sleeve 16, and the bottom end of the anti-slip sleeve 16 penetrates the buffer ring 17. The buffer ring 17 is located on the upper end of the limiting plate 15. The top of the buffer ring 17 is engaged with the bottom of the protective plate 21. The bearing platform 11 and the conical clamp 12 are both three-lobed ring splicing structures. The inner wall of the conical clamp 12 is provided with a support spring 13. The upper outer wall of the conical clamp 12 is sleeved with the limiting ring 14. The limiting ring 14 is a rubber ring with elastic rubber material. It is located inside the truncated cone groove inside the bearing platform 11. The center of the limiting ring 14 is aligned with the center of the conical clamp 12. The bottom end of the steel strand 20 passes through the inside of the conical clamp 12. The upper end of the steel strand 20 passes through the inside of the sleeve 19. The sleeve 19 is composed of three central pipes through steel rods. The sleeve 19 is placed on the upper end of the anti-slip sleeve 16. The upper end of the anti-slip sleeve 16 is engaged with the upper end of the limiting bolt 10. The limiting bolt 10 passes through the threaded ring 18 located inside the protective plate 21.

[0045] Referring to the attached diagrams in the instruction manual Figure 1-6 As shown, the upper end of the support platform 11 has a frustum-shaped structure during use, such as... Figure 1 and Figure 4 As shown, the conical clamp 12 and the support platform 11 form a three-lobed structure, as... Figure 4-5 As shown, during use, the support platform 11 is located inside the limiting plate 15, and the steel strand 20 passes through the support platform 11 within the limiting plate 15. Figure 2-3 As shown, during use, the bottom end of the steel strand 20 passes through the three-lobed structure of the conical clamp 12. The support spring 13, located on the inner wall of the conical clamp 12, holds the steel strand 20 in place. The diameter of the steel strand 20 is designed to expand the three-lobed structure of the conical clamp 12 as needed. Figure 4-5 As shown, the limiting ring 14 located on the outer wall of the upper end of the conical clamp 12 tightens to prevent the upper end of the conical clamp 12 from rubbing against the inner wall of the bearing platform 11. During use, the steel strand 20 penetrates the inner wall of the protective plate 21, allowing the bottom end of the steel strand 20 to simultaneously penetrate the anti-slip sleeve 16 inside the buffer ring 17. Figure 2As shown, the buffer ring 17 is made of elastic, flexible rubber cushioning material. The buffer ring 17 supports the space between the protective plate 21 and the limiting plate 15, limiting the installation space of the anti-slip sleeve 16. The anti-slip sleeve 16 is embedded inside the buffer ring 17. The sleeve 19 located at the upper end of the anti-slip sleeve 16 further bundles the steel strand 20. Figure 2-6 As shown, the upper surface of the limiting bolt 10 is wrapped by the sleeve 19 and the anti-slip sleeve 16. When in use, the limiting bolt 10 passes through the buffer ring 17, the bearing platform 11 and the limiting plate 15 and is tightly connected to prevent the steel strand 20 from separating from the protective side shell 1. Multiple steel strands 20 are rotatably connected to the inner wall surfaces of the limiting screw sleeve 1 7, the limiting screw sleeve 2 8 and the limiting screw sleeve 3 9 and are tightly connected. The three steel strands 20 drive the limiting screw sleeve 1 7, the limiting screw sleeve 2 8 and the limiting screw sleeve 3 9 to rotate and lift together. The limiting screw sleeve 1 7, the limiting screw sleeve 2 8 and the limiting screw sleeve 3 9 are aligned with the three conical clamps 12, so that the conical clamps 12 are further pushed into the frustum slot of the bearing platform 11 and tightly clamp the steel strand 20. When in use, the positioning bolt 5 is used to tightly connect the protective side shell 1 from the side wall surface to the interior.

[0046] Please refer to Figure 1-6 The present invention provides a technical solution: a shear-unlocking recyclable prestressed anchor cable and its construction process;

[0047] Step 1: To lock the tension of the steel strands 20, pass each steel strand 20 sequentially through the protective plate 21, the limiting plate 15, the bearing platform 11, and the conical clamp 12 until it reaches the bottom of the limiting screw sleeve 1 7, the limiting screw sleeve 2 8, and the limiting screw sleeve 3 9. Rotate the steel strands 20 counterclockwise until they can no longer rotate, so that the conical clamp 12 is tightly attached to the steel strands 20, and then the tensioning operation can be carried out.

[0048] Step Two: Unlocking and Recycling of Steel Strand 20. After construction, during the recycling operation, continue tensioning based on the designed pull-out force until the positioning bolts 5 used for fixing around the limiting plate 15 and the bearing platform 11 are sheared. At the same time, the buffer ring 17 is compressed, that is, the limiting plate 15 and the bearing platform 11 achieve the purpose of moving towards the protective plate 21 to unlock. On the other hand, the buffer ring 17 buffers the impact force towards the protective plate 21 after the positioning bolts 5 around the limiting plate 15 and the bearing platform 11 are sheared, preventing the positioning bolts 5 around the protective plate 21 from shearing. The limiting plate 15 and the bearing platform 11 slide towards the reserved space on the protective side shell 1 and the protective bottom shell 2, and then the applied tension is released. Under the combined action of gravity and buffer ring 17, the limiting plate 15 and the bearing platform 11 move towards the protective plate 21. The bearing platform 11 is no longer restricted by the positioning bolt 5. At the same time, a gap will be generated between the limiting plate 15 and the bearing platform 11. The support spring 13 on the conical clamp 12 will play its role, causing the conical clamp 12 to relax and fall off to the limiting screw sleeve 1 7, the limiting screw sleeve 2 8 and the limiting screw sleeve 3 9, thus unlocking the lock. At this point, the anchor cable unlocking construction is completed. Subsequently, the steel strand 20 can be pulled out manually. Pushing the steel strand 20 will separate the three-lobed bearing platform 11, and then the three-lobed conical clamp 12 will also separate. Finally, the steel strand 20 can be pulled out manually to complete the recovery.

[0049] During the overall installation of the anchor cable equipment, refer to step one above and the accompanying drawings in the instruction manual. Figure 1-4 As shown:

[0050] S1: The protective side shell 1 and the protective bottom shell 2 have upward openings, so that the protective plate 21 is placed with its side facing upward. As the limiting groove 3, positioning plate 4, limiting cavity 6, bearing platform 11, limiting plate 15 and buffer ring 17 are installed from bottom to top, the positioning bolt 5 and the limiting bolt 10 are then installed. After the positioning bolt 5 and the protective plate 21 are installed with the steel strand 20 according to the above step one, the steel strand 20 rotates, causing the internal support spring 13 of the conical clamp 12 to expand synchronously and connect tightly with the truncated groove of the bearing platform 11. At this time, the bottom end of the steel strand 20 is tightly connected with the limiting screw sleeve 1 7, the limiting screw sleeve 2 8 and the limiting screw sleeve 3 9, so that the limiting screw sleeve 1 7 rotates synchronously and connects tightly with the limiting groove 3. At the same time, the limiting screw sleeve 1 7 pushes the conical clamp 12 to move closer to the bearing. When the steel strand 20 rotates to the point where it cannot rotate, the conical clamp 12 is tightly attached to the steel strand 20, thus completing the locking of the steel strand 20.

[0051] S2: As Figure 2 As shown, the side walls of the protective side shell 1 and the protective bottom shell 2 are fixed to the internal structure by positioning bolts 5, and then the limiting bolts 10 are vertically installed from the upper end of the protective plate 21 into the interior of the protective side shell 1 and the protective bottom shell 2 to maintain a tight connection, so as to prevent the protective side shell 1 and the protective bottom shell 2 from falling off and separating from the steel strand 20 during use.

[0052] During the overall installation of the anchor cable equipment, refer to step two above and the accompanying drawings in the instruction manual. Figure 1-4 As shown:

[0053] S3: After construction is completed, during the recycling operation, tensioning continues based on the designed pull-out force until the positioning bolts 5 used for fixing around the limiting plate 15 and the bearing platform 11 are sheared. At the same time, the buffer ring 17 is compressed, that is, the limiting plate 15 and the bearing platform 11 achieve the purpose of moving and unlocking towards the protective plate 21. On the other hand, the buffer ring 17 buffers the impact force towards the protective plate 21 after the positioning bolts 5 around the limiting plate 15 and the bearing platform 11 are sheared, preventing the positioning bolts 5 around the protective plate 21 from shearing. The space reserved on the side of the bottom shell 2 is slid, and then the applied tension is released. Under the combined action of gravity and buffer ring 17, the limiting plate 15 and the bearing platform 11 move towards the protective bottom shell 2. The bearing platform 11 is no longer restricted by the positioning bolt 5. At the same time, a gap will be generated between the limiting plate 15 and the bearing platform 11. The support spring 13 on the conical clamp 12 will play its role, causing the conical clamp 12 to relax and fall off to the limiting screw sleeve 1 7, the limiting screw sleeve 2 8 and the limiting screw sleeve 3 9, thus completing the unlocking of the lock. At this point, the anchor cable unlocking construction is completed. The subsequent manual pulling out of the steel strand 20 can complete the recovery.

[0054] Working Principle: When using this shear-unlocking recyclable prestressed anchor cable and its construction process, firstly, after connecting and installing the protective side shell 1 and the protective bottom shell 2, the limiting groove 3 is located inside the protective bottom shell 2. As the positioning plate 4, limiting cavity 6, bearing platform 11, limiting plate 15, buffer ring 17, and protective plate 21 are sequentially placed inside from bottom to top, the protective side shell 1 is stably connected to the internal structure. The limiting screw sleeve 1 7, limiting screw sleeve 2 8, and limiting screw sleeve 3 9 are installed inside the positioning plate 4 and the limiting cavity 6. During use, the steel strand 20 is sequentially inserted into the sleeve 19 and the anti-slip sleeve 16. By inserting the bottom end of the steel strand 20 into the conical clamp 12, which has a three-lobed structure, the conical clamp 12, in conjunction with the limiting ring 14, wraps around the surface of the steel strand 20. As the bottom end of the steel strand 20 is inserted into the threaded connection of the limiting screw sleeve 2 8, the limiting bolt 10 is inserted. Inside the protective plate 21, buffer ring 17, limiting plate 15, and bearing platform 11, the bottom end of the limiting bolt 10 is set in a parallel state with the limiting screw sleeve 1 7, limiting screw sleeve 2 8, and limiting screw sleeve 3 9. As the steel strand 20 rotates, it drives the internal groove of the limiting screw sleeve 2 8 to connect tightly. As the three steel strands 20 rotate synchronously, the three steel strands 20 drive the limiting screw sleeve 1 7, limiting screw sleeve 2 8, and limiting screw sleeve 3 9 to connect tightly with the positioning plate 4 and the limiting cavity 6, locking the installation position of the three steel strands 20. Then, the positioning bolt 5 is inserted from the side wall of the protective side shell 1 and connected tightly with the internal structure. During the locking process, the steel strand 20 is rotated to gradually pass through the conical clamp 12 and drive the conical clamp 12 to move towards the positioning plate 4 until the steel strand 20 can no longer rotate and the bottom end of the conical clamp 12 contacts the positioning plate 4, thus completing the locking of the anchor cable.

[0055] During the unlocking process, a pull force is applied on top of the designed pull force to shear the positioning bolts 5 on the support platform 11 and the limiting plate 15. The external pull force is released, and the bolts move towards the positioning plate 4 under the action of gravity and the buffer ring 17. At this time, a space is created between the support platform 11 and the limiting plate 15. The three-lobed structure of the support platform 11 opens up, and the conical clamp 12 opens up under the action of the support spring 13. The steel strand 20 is unlocked, and the purpose of recycling the steel strand 20 can be achieved.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A shear-unlocking recyclable prestressed anchor cable, comprising a protective side shell (1) and a protective plate (21), characterized in that: The protective side shell (1) is configured as a cylindrical structure. The bottom end of the protective side shell (1) is installed with the protective bottom shell (2). The protective bottom shell (2) is provided with a limiting groove (3). The top end of the limiting groove (3) is flush with the bottom end of the positioning plate (4). The cross-section of the protective side shell (1) and the protective bottom shell (2) is configured as a U-shaped structure. The bottom end of the protective side shell (1) is provided with a groove that engages with the top end of the protective bottom shell (2). The bottom end of the protective bottom shell (2) is configured as an arc-shaped structure. The protective plate (21) is installed on the upper end of the protective side shell (1), and the protective plate (21) has a hole through which the anti-slip sleeve (16) penetrates. The sleeve (19) and the anti-slip sleeve (16) are wrapped around the upper surface of the steel strand (20). The positioning plate (4), the limiting cavity (6), the bearing platform (11), and the limiting plate (15) are arranged vertically from bottom to top inside the protective side shell (1). The bottom end of the limiting plate (15) is provided with a groove that engages with the bearing platform (11). The positioning plate (4) and the bearing platform (11) are threadedly connected with limiting screw sleeve one (7), limiting screw sleeve two (8), and limiting screw sleeve three (9). The side walls of the protective plate (21), the limiting plate (15), the bearing platform (11), and the positioning plate (4) are respectively connected with positioning bolts. The positioning bolts are installed vertically on the surface of the protective side shell (1). The internal holes of the limiting screw sleeve one (7), limiting screw sleeve two (8) and limiting screw sleeve three (9) are all configured to fit the outer contour of the steel strand (20) in an open structure. The bearing platform (11) has three frustum grooves arranged in a ring inside, and a conical clamp (12) is installed inside the frustum groove of the bearing platform (11). The limiting screw sleeve can push the conical clamp (12) to move closer to the limiting plate (15). The support platform (11) and the conical clamp (12) are both three-lobed ring splicing structures, and the inner wall of the conical clamp (12) is provided with a support spring (13). The steel strand (20) passes through the protective plate (21), the limiting plate (15), the bearing platform (11), and the conical clamp (12) in sequence until it reaches the bottom of the internal hole of the limiting screw sleeve.

2. The shear-unlocking recyclable prestressed anchor cable according to claim 1, characterized in that: The first limiting screw sleeve (7) is provided with a second limiting screw sleeve (8) on one side in parallel, and the second limiting screw sleeve (8) is provided with a third limiting screw sleeve (9) on one side in parallel. The bottom ends of the third limiting screw sleeve (9), the second limiting screw sleeve (8) and the first limiting screw sleeve (7) are located inside the limiting groove (3).

3. The shear-unlocking recyclable prestressed anchor cable according to claim 2, characterized in that: The upper outer wall of the conical clamp (12) is fitted with the limiting ring (14).

4. A shear-unlocking recyclable prestressed anchor cable according to claim 3, characterized in that: The limiting ring (14) is located inside the frustum groove inside the bearing platform (11), and the center of the limiting ring (14) is aligned with the center of the conical clamp (12). The conical clamp (12) is penetrated by the bottom end of the steel strand (20), and the upper end of the steel strand (20) penetrates the inside of the sleeve (19).

5. A shear-unlocking recyclable prestressed anchor cable according to claim 4, characterized in that: The sleeve (19) is placed on the upper end of the anti-slip sleeve (16), and the upper end of the anti-slip sleeve (16) is engaged with the upper end of the limiting bolt (10), and the limiting bolt (10) passes through the threaded ring (18) located inside the protective plate (21).

6. A shear-unlocking recyclable prestressed anchor cable according to claim 5, characterized in that: The steel strand (20) passes through the inside of the anti-slip sleeve (16), and the bottom end of the anti-slip sleeve (16) passes through the inside of the buffer ring (17). The buffer ring (17) is located at the upper end of the limiting plate (15), and the top end of the buffer ring (17) is engaged with the bottom end of the protective plate (21).

7. A construction process based on the shear-unlocking recyclable prestressed anchor cable as described in claim 6, characterized in that: The specific process steps are as follows: Step 1: Tension and lock the steel strands (20). Pass each steel strand (20) through the protective plate (21), the limiting plate (15), the bearing platform (11), and the conical clamp (12) in sequence until it reaches the bottom of the limiting screw sleeve 1 (7), the limiting screw sleeve 2 (8), and the limiting screw sleeve 3 (9). Rotate the steel strands (20) counterclockwise. At this time, the bottom end of the steel strands (20) is tightly connected with the limiting screw sleeve 1 (7), the limiting screw sleeve 2 (8), and the limiting screw sleeve 3 (9), so that the limiting screw sleeves rotate synchronously. At the same time, the limiting screw sleeves push the conical clamp (12) to move closer to the limiting plate (15) until the limiting screw sleeves can no longer rotate, so that the conical clamp (12) is close to the steel strands (20), and the tensioning operation can be carried out. Step 2: Unlocking and recycling of the steel strand (20). After construction, during the recycling operation, continue tensioning based on the designed pull-out force until the positioning bolts (5) used for fixing around the limiting plate (15) and the bearing platform (11) are sheared. At the same time, the buffer ring (17) is compressed, and the limiting plate (15) and the bearing platform (11) move towards the protective plate (21). The buffer ring (17) buffers the impact force towards the protective plate (21) after the positioning bolts (5) around the limiting plate (15) and the bearing platform (11) are sheared, preventing the positioning bolts (5) around the protective plate (21) from shearing. Then, the tension is relaxed. Under the pull of gravity and the combined action of the buffer ring (17), the limiting plate (15) and the bearing platform (11) move towards the protective bottom shell (2). The bearing platform (11) loses the restriction of the positioning bolt (5). At the same time, a gap will be generated between the limiting plate (15) and the bearing platform (11). The support spring (13) on the conical clamp (12) will play a role, causing the conical clamp (12) to relax and fall off towards the limiting screw sleeve one (7), the limiting screw sleeve two (8) and the limiting screw sleeve three (9), thus completing the unlocking of the lock. At this point, the anchor cable has completed the unlocking construction. The subsequent manual pulling out of the steel strand (20) can complete the recycling.

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