A prestressed anchor

Abstract

This utility model belongs to the technical field of support devices and discloses a prestressed pressure-yielding anchor. The prestressed pressure-yielding anchor of this utility model includes an anchoring sleeve, a bearing seat, and a spring. After anchoring the prestressed anchor cable, when the prestressed anchor cable retracts and relaxes, the spring's rebound compensates for the prestress lost due to the retraction and relaxation. When the soil or rock mass suddenly undergoes large deformation or rock pressure disturbance, the locking buckle on the anchoring sleeve moves away from the soil or rock mass relative to the prestressed anchor cable, achieving pressure relief and buffering of the anchor cable, preventing direct breakage and permanent failure. The anchor removal process does not require specialized tools, allowing for easy disassembly and recycling of the anchor cable from the soil or rock mass; the disassembly operation is simple.

Description

Technical Field

[0001] This utility model relates to the field of support device technology, specifically to a prestressed pressure relief anchor. Background Technology

[0002] In underground engineering and foundation pit support projects, prestressed anchor cables are often used to achieve stable support for structures. These prestressed anchor cables need to be fixed using anchorages, and the function of the anchorages directly affects the support effect of the prestressed anchor cables.

[0003] Existing anchorages mostly employ a wedge-type structure for anchoring prestressed anchor cables. During use, anchorage is achieved by the wedge engaging with the conical holes in the anchor plate. However, the significant shrinkage of the prestressed anchor cable after anchoring leads to a direct loss of prestress, affecting the support effectiveness. Furthermore, prestressed anchor cables suffer varying degrees of damage over time during the support process. Sudden large deformations in the soil or rock masses, or disturbances caused by rock pressure, can lead to direct breakage and permanent failure of the anchor cable, rendering it ineffective. In addition, existing anchorages have a low recycling rate, and the removal process requires specialized tools, making disassembly cumbersome. Utility Model Content

[0004] The purpose of this invention is to propose a prestressed pressure relief anchor that can achieve prestress compensation and pressure relief buffering, and can also be recycled.

[0005] To achieve the above objectives, this utility model adopts the following technical solution:

[0006] A prestressed relief anchor includes an anchor sleeve, a bearing seat, and a spring;

[0007] The lower end of the anchoring sleeve is slidably connected to the pressure bearing seat, and a spring is connected between the anchoring sleeve and the pressure bearing seat;

[0008] The bearing seat and anchor sleeve allow the prestressed anchor cables to pass through sequentially;

[0009] The inner wall of the anchor sleeve is provided with several clamping latches, which can abut against the prestressed anchor cable. The side wall of the anchor sleeve is provided with threaded holes, and a clamping bolt is threaded into the threaded holes. The end of the clamping bolt can abut against the clamping latches.

[0010] Furthermore, one end of the clamping latch is connected to the inner wall of the anchoring sleeve, and the other end of the clamping latch extends toward the central axis of the anchoring sleeve and downwards.

[0011] Furthermore, the outer end of the other end of the clamping lock is provided with a platform for abutting against the end of the clamping bolt, and the inner end of the other end of the clamping lock is provided with a triangular limiting block for abutting against the prestressed anchor cable.

[0012] Furthermore, it also includes a hollow column, the interior of which has a hollow structure, and a limiting ring is set at the upper end of the hollow column;

[0013] A guide hole is made at the middle position of the lower end of the anchor sleeve;

[0014] The lower end of the hollow column passes through the guide hole and the spring in sequence. The lower end of the hollow column is connected to the middle position of the bearing seat. The two ends of the spring abut against the bearing seat and the anchoring sleeve, respectively.

[0015] Furthermore, the lower end of the hollow column is provided with an external thread, and a threaded hole is opened in the middle position of the pressure seat, with the lower end of the hollow column threadedly connected to the threaded hole.

[0016] Furthermore, a groove is provided on the bearing seat at the edge of the threaded hole, and the spring is located in the groove.

[0017] Furthermore, the hollow column and the anchoring sleeve are arranged coaxially.

[0018] Furthermore, several sets of tight-fitting latches are provided at equal intervals along the axial direction of the anchoring sleeve, and each set of tight-fitting latches includes several tight-fitting latches arranged at equal intervals along the circumference of the anchoring sleeve.

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

[0020] This utility model of a prestressed relief anchor can compensate for the prestress loss caused by the relaxation of the prestressed anchor cable after anchoring, through the rebound of the spring. When the prestressed anchor cable retracts and relaxes, the tight locking buckle on the anchor sleeve moves away from the prestressed anchor cable relative to the rock and soil mass, realizing the relief and buffering of the anchor cable and avoiding direct breakage and permanent failure of the anchor cable. The anchor removal process does not require the use of special tools and can easily remove the anchor cable from the rock and soil mass for recycling. The disassembly operation is simple. Attached Figure Description

[0021] Figure 1 This is a perspective view of the prestressed relief anchorage according to an embodiment of the present utility model;

[0022] Figure 2 This is an exploded view of the prestressed relief anchorage according to an embodiment of this utility model;

[0023] Figure 3 This is an exploded view of a half-section of the prestressed relief anchorage according to an embodiment of this utility model;

[0024] Figure 4 This is an exploded view of the prestressed relief anchorage structure in an embodiment of this utility model;

[0025] Figure 5This is a front view of the prestressed relief anchorage according to an embodiment of the present invention;

[0026] Figure 6 This is a structural diagram of the prestressed relief anchor used for anchor cable support in an embodiment of this utility model;

[0027] Figure label:

[0028] 1. Anchor sleeve; 11. Threaded hole; 12. Tightening bolt; 13. Guide hole; 2. Bearing seat; 21. Threaded hole; 22. Groove; 3. Spring; 4. Prestressed anchor cable; 5. Tightening lock; 51. Platform; 52. Limiting block; 6. Hollow column; 61. Limiting ring; 7. Soil and rock mass. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Combination Figures 1 to 6 As shown, this utility model proposes a prestressed pressure relief anchor, including an anchoring sleeve 1, a pressure bearing seat 2, and a spring 3.

[0032] The lower end of the anchor sleeve 1 is slidably connected to the bearing seat 2, and a spring 3 is connected between the anchor sleeve 1 and the bearing seat 2. After the prestressed anchor cable 4 is anchored, when the prestressed anchor cable 4 retracts and relaxes, the rebound of the spring 3 can compensate for the prestress lost by the prestressed anchor cable 4 due to the retraction and relaxation.

[0033] The bearing seat 2 has an opening in the middle, and the anchor sleeve 1 has a hollow structure inside. The bearing seat 2 and the anchor sleeve 1 allow the prestressed anchor cable 4 to pass through in sequence.

[0034] The inner wall of the anchor sleeve 1 is provided with several clamping latches 5, which can abut against the prestressed anchor cable 4. The side wall of the anchor sleeve 1 is provided with threaded holes 11, and the threaded holes 11 are internally threaded with clamping bolts 12, the ends of which can abut against the clamping latches 5. Among them, three sets of clamping latches 5 are equally spaced along the axial direction of the anchor sleeve 1, and each set of clamping latches 5 includes four clamping latches 5 equally spaced along the circumference of the anchor sleeve 1.

[0035] By rotating the clamping bolt 12 in the forward direction, the clamping bolt 12 drives the clamping lock 5 to abut against the prestressed anchor cable 4, thereby achieving the locking and anchoring of the prestressed anchor cable 4.

[0036] One end of the clamping lock 5 is connected to the inner wall of the anchor sleeve 1, and the other end of the clamping lock 5 extends toward the central axis and downwards of the anchor sleeve 1. When the rock and soil suddenly undergo large deformation or when rock pressure disturbance occurs, the clamping lock 5 on the anchor sleeve 1 moves away from the rock and soil relative to the prestressed anchor cable 4 to avoid the prestressed anchor cable 4 from breaking directly and permanently failing.

[0037] The outer end of the other end of the clamping lock 5 is provided with a platform 51 for abutting against the end of the clamping bolt 12, so that the clamping bolt 12 is firmly abutting against the outer end of the other end of the clamping lock 5. The inner end of the other end of the clamping lock 5 is provided with a triangular limiting block 52 for abutting against the prestressed anchor cable 4, so that the inner end of the other end of the clamping lock 5 is firmly abutting against the prestressed anchor cable 4.

[0038] The hollow column 6 has a hollow internal structure. A limiting ring 61 is provided at the upper end of the hollow column 6. A guide hole 13 is opened at the middle position of the lower end of the anchor sleeve 1. The lower end of the hollow column 6 passes through the guide hole 13 and the spring 3 in sequence. The hollow column 6 and the anchor sleeve 1 are arranged coaxially. The lower end of the hollow column 6 is connected to the middle position of the pressure seat 2. The two ends of the spring 3 abut against the pressure seat 2 and the anchor sleeve 1, respectively.

[0039] The hollow column 6 has an external thread at its lower end, and a threaded hole 21 is opened in the middle of the bearing seat 2. The lower end of the hollow column 6 is threaded to the threaded hole 21.

[0040] The hollow column 6 slides along the guide hole 13, allowing the anchor sleeve 1 to slide along the hollow column 6, while the limiting ring 61 limits the sliding.

[0041] A groove 22 is provided on the bearing seat 2 at the edge of the threaded hole 21, and the spring 3 is located in the groove 22. During the compression and rebound of the spring 3, the groove 22 and the hollow column 6 jointly guide the spring 3 to prevent the spring 3 from tilting and deforming.

[0042] The prestressed relief anchorage in this embodiment performs the following processes for anchoring, supporting, and removing the prestressed anchor cable:

[0043] The inner end of the prestressed anchor cable 4 is anchored to the borehole in the soil / rock mass 7 using an anchoring agent. The outer end of the prestressed anchor cable 4 passes through the bearing seat 2 and the anchoring sleeve 1 in sequence, so that the bearing seat 2 abuts against the outer wall of the soil / rock mass 7. At this time, a gap is left between the prestressed anchor cable 4 and the other end of the clamping lock 5. Rotating the clamping bolt 12 in the forward direction causes the clamping bolt 12 to drive the clamping lock 5 to abut against the prestressed anchor cable 4, thus anchoring the prestressed anchor cable 4. At this time, the spring 3 is in a compressed state.

[0044] During the support process, when the prestressed anchor cable 4 retracts and relaxes, the spring 3 rebounds to compensate for the prestress lost by the prestressed anchor cable 4 due to relaxation. When the rock and soil mass 7 suddenly undergoes large deformation or rock pressure disturbance, the tight locking buckle 5 on the anchor sleeve 1 moves away from the rock and soil mass 7 relative to the prestressed anchor cable 4 to avoid the prestressed anchor cable 4 from breaking directly and permanently failing.

[0045] No special tools are needed during the anchor removal process. By rotating the tightening bolt 12 in the opposite direction, the tightening lock 5 is disengaged from the prestressed anchor cable 4, which can easily remove the anchor cable from the rock and soil for recycling. The disassembly operation is simple.

[0046] The present invention has been described in detail above with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the prestressed relief anchor of the present invention. The prestressed relief anchor described in this invention, after anchoring the prestressed anchor cable 4, compensates for the prestress loss due to the relaxation of the prestressed anchor cable 4 by the rebound of the spring 3 when the prestressed anchor cable 4 retracts and relaxes; when the rock and soil mass 7 suddenly undergoes large deformation or impact pressure disturbance, the clamping buckle 5 on the anchor sleeve 1 moves away from the rock and soil mass 7 relative to the prestressed anchor cable 4, realizing the relief buffer of the anchor cable and preventing the anchor cable from breaking directly and permanently failing; the anchor removal process does not require specialized tools, and the anchor cable can be easily removed from the rock and soil mass for recycling, making the disassembly operation simple.

[0047] Of course, the above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model and should be protected by the present utility model.

Claims

1. A prestressed venting anchor, characterized in that, Includes anchor sleeve, bearing seat and spring; The lower end of the anchoring sleeve is slidably connected to the pressure bearing seat, and a spring is connected between the anchoring sleeve and the pressure bearing seat; The bearing seat and anchor sleeve allow the prestressed anchor cables to pass through sequentially; The inner wall of the anchor sleeve is provided with several clamping latches, which can abut against the prestressed anchor cable. The side wall of the anchor sleeve is provided with threaded holes, and a clamping bolt is threaded into the threaded holes. The end of the clamping bolt can abut against the clamping latches.

2. The prestressed relief anchorage according to claim 1, characterized in that, One end of the clamping lock is connected to the inner wall of the anchoring sleeve, and the other end of the clamping lock extends toward the central axis of the anchoring sleeve and downwards.

3. The prestressed relief anchorage according to claim 1 or 2, characterized in that, The outer end of the other end of the clamping lock is provided with a platform for abutting against the end of the clamping bolt, and the inner end of the other end of the clamping lock is provided with a triangular limiting block for abutting against the prestressed anchor cable.

4. The prestressed relief anchorage according to claim 1, characterized in that, It also includes hollow columns, which have a hollow interior and a limiting ring at the top. A guide hole is made at the middle position of the lower end of the anchor sleeve; The lower end of the hollow column passes through the guide hole and the spring in sequence. The lower end of the hollow column is connected to the middle position of the bearing seat. The two ends of the spring abut against the bearing seat and the anchoring sleeve, respectively.

5. The prestressed relief anchorage according to claim 4, characterized in that, The lower end of the hollow column is provided with an external thread, and a threaded hole is opened in the middle of the bearing seat. The lower end of the hollow column is threaded to the threaded hole.

6. The prestressed relief anchorage according to claim 4, characterized in that, The pressure seat has a groove at the edge of the threaded hole, and the spring is located in the groove.

7. The prestressed relief anchorage according to claim 4, characterized in that, The hollow column and the anchoring sleeve are arranged coaxially.

8. The prestressed relief anchorage according to claim 1, characterized in that, Several sets of tight-fitting latches are evenly spaced along the axial direction of the anchoring sleeve. Each set of tight-fitting latches includes several tight-fitting latches evenly spaced along the circumference of the anchoring sleeve.

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