Anchoring assembly of recyclable cable bolt

Abstract

The present invention discloses an anchoring assembly for a recyclable cable anchor, which comprises a cable anchor, a pull pin and a bottom anchor head. The bottom anchor head includes an internal thread anchor with internal threads. The bottom end of the cable anchor is fixedly connected with a connecting section, and the connecting section is in threaded fit with the internal thread anchor, and the lead angle of the thread is greater than the self-locking angle. The pull pin is inserted along the length direction into the connecting section and the internal thread anchor is locked in the circumferential direction, and the pull pin can be pulled out and disengaged to release the internal thread anchor. The present invention adopts a large-lead angle thread connection and combines the circumferential locking function of the pull pin. When recycling the cable anchor, it is only necessary to pull out the pull pin. The recycling operation of the cable anchor is simple and convenient, which improves the construction efficiency. Moreover, during anchoring, the foundation pit support is firm, and the requirement for the cable anchor to transmit the torsional moment is not high, ultimately achieving the purpose of reducing the construction cost and improving the construction efficiency.

Description

Technical Field

[0001] The present invention relates to a construction anchoring device, and particularly to an anchoring assembly for a retrievable anchor cable. Background Art

[0002] Temporary support is a relatively common safety protection measure in construction, which is achieved through the anchoring of anchor cables. Since it is a temporary support, usually the anchor cable cannot be retrieved after the support function fails, and it is buried underground together with the structure, forming underground garbage, causing underground environmental pollution, and having a serious impact on the construction of adjacent plots and the long-term planning and sustainable development of the city.

[0003] To solve the above problems, retrievable anchor cables have emerged in the prior art. The connectors and anchor fittings of the anchoring section of the retrievable anchor cable can select various connection and separation methods. The connection method generally adopts a detachable connection, that is, a threaded connection or a swivel connection. When retrieving the anchor cable, a rotational force is applied to the anchor cable to separate it from the threaded connection or the swivel structure, and it is pulled out by an external force to complete the retrieval of the anchor cable.

[0004] During actual construction, the bottom end of the anchor cable is connected to the anchor head through a threaded connection. Since prestress needs to be applied later to achieve anchoring, the lead angle of the thread needs to be much smaller than the self-locking angle, otherwise the thread will separate under the action of the circumferential component force and thus anchoring cannot be achieved. After the threaded connection structure is anchored underground, it may rust in the anchoring environment and the anchor cable cannot be rotated during retrieval. Moreover, applying an external force to transfer the torsional moment to the bottom also has relatively high requirements for the anchor cable, so the cost will also increase.

[0005] Therefore, it is necessary to improve the existing structure of the retrievable anchor cable, so that the retrieval operation of the anchor cable is simple and convenient, and the foundation pit is firmly supported during anchoring, with relatively low requirements for the anchor cable to transfer the torsional moment, ultimately achieving the purpose of reducing construction costs and improving construction efficiency. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an anchoring assembly for a retrievable anchor cable, so that the retrieval operation of the anchor cable is simple and convenient, and the foundation pit is firmly supported during anchoring, with relatively low requirements for the anchor cable to transfer the torsional moment, ultimately achieving the purpose of reducing construction costs and improving construction efficiency.

[0007] The anchoring assembly of the retrievable anchor cable of the present invention includes an anchor cable, a pull pin, and a bottom anchor head. The bottom anchor head includes an internal thread anchor with an internal thread. The bottom end of the anchor cable is fixedly connected with a connection section, and the connection section is in threaded cooperation with the internal thread anchor. The lead angle of the thread is greater than the self-locking angle.

[0008] The pin is inserted into the connecting section along the length direction and locks the internal thread anchor in the circumferential direction, and the pin can be pulled out to release the internal thread anchor.

[0009] Furthermore, the cross-section of the pin is polygonal, the internal thread anchor is provided with an internal thread for connecting with the connecting section, a polygonal hole for cooperating with the pin is formed at the bottom of the internal thread, and the connecting section is provided with a polygonal hole for cooperating with the pin.

[0010] Furthermore, the connecting section is further provided with an operation hole for placing and removing the pin. Along with the cable anchor, a pull wire is provided. One end of the pull wire passes through the operation hole and is fixedly connected to the pin, and the other end is exposed outside the external anchor head during anchoring.

[0011] Furthermore, the cable anchor is sleeved with an isolation pipe, and the pull wire is located inside the isolation pipe.

[0012] Furthermore, the bottom anchor head further includes at least two anchor plates arranged side by side along the length direction. The anchor plates are fixedly connected by bolts, and the internal thread anchor is fixed to the anchor plates.

[0013] Furthermore, a steel reinforcement cage is welded and connected to the anchor plate, and the length of the steel reinforcement cage corresponds to the anchor body during anchoring construction.

[0014] Furthermore, the bottom end of the isolation pipe forms a seal with the corresponding anchor plate.

[0015] Furthermore, the connecting section is a hollow structure, and a turning block is fixedly arranged inside the hollow structure. The turning block is provided with a through hole facing the pin in the length direction, and the pull wire passes through the through hole of the turning block and is connected to the pin.

[0016] Advantages of the present invention: The anchoring assembly of the recyclable cable anchor of the present invention adopts a large lead angle thread connection and combines the circumferential locking function of the pin. When recycling the cable anchor, the pin can be pulled out. The recycling operation of the cable anchor is simple and convenient, improving the construction efficiency. And during anchoring, the foundation pit support is firm, and the requirement for the cable anchor to transmit the torsional moment is not high, ultimately achieving the purpose of reducing the construction cost and improving the construction efficiency. Description of the Drawings

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is Figure 1 an enlarged view of part A of

[0020] Figure 3 is a distribution diagram of the anchor and bolts on the anchor plate;

[0021] Figure 4 Schematic diagram of the support structure formed by the present invention. Specific embodiments

[0022] As Figures 1-4 shown: The anchoring assembly of the recoverable anchor cable in this embodiment includes an anchor cable 3, a pull pin 7, and a bottom anchor head 4. The bottom anchor head 4 includes an internal thread anchor 403 provided with internal threads. The bottom end of the anchor cable 3 is fixedly connected with a connecting section 301, and the connecting section 301 is in threaded cooperation with the internal thread anchor 403. The lead angle of the thread is greater than the self-locking angle; when the lead angle of the threaded connection is greater than the self-locking angle, it can naturally come out when an axial force (length direction) is applied.

[0023] The pull pin 7 is inserted along the length direction into the connecting section 301 and the internal thread anchor 403 to lock in the circumferential direction, and the pull pin 7 can be pulled out and released from the internal thread anchor 403; during anchoring, the pull pin 7 is inserted into the connecting section 301 and the internal thread anchor 403 so that the connecting section 301 and the internal thread anchor 403 are locked in the circumferential direction. When a tensile force in the length direction is applied, the thread pair bears the load and will not come out; when the anchor cable 3 needs to be recovered, the pull pin 7 is pulled out from the internal thread anchor 403, and the relative freedom degree between the connecting section 301 and the internal thread anchor 403 in the circumferential direction is released. Since the lead angle of the thread is greater than the self-locking angle, the anchor cable 3 directly disengages from the internal thread anchor under the action of prestress and is completed for recovery after being pulled out by an external force. In this structure, due to the locking function of the pull pin, the lead angle can be much greater than the self-locking angle, and the anchor cable can be conveniently pulled out after the pull pin releases the lock.

[0024] In this embodiment, the cross-section of the pull pin 7 is polygonal. The internal thread anchor is provided with internal threads for connecting with the connecting section, and a polygonal hole 4031 for cooperating with the pull pin is formed at the bottom of the internal thread. The connecting section is provided with a polygonal hole for cooperating with the pull pin; as shown in the figure, grease is applied when the pull pin and the thread pair are used to make the later pulling out smooth; the polygonal structure makes the force transmission of the pull pin reliable and has more force-bearing surfaces, having better load-bearing capacity.

[0025] In this embodiment, the connecting section 301 is further provided with an operation hole 3011 for placing and removing the pull pin. Along with the anchor cable 3, a guy wire 8 is provided. Generally, the guy wire 8 is made of steel wire or thin steel strand. One end of the guy wire 8 passes through the operation hole 3011 and is fixedly connected to the pull pin 7, which can be achieved by existing mechanical connection structures, and the other end is exposed outside the outer anchor head. As shown in the figure, when implanting the bottom anchor head 4 and the anchor cable 3, the connecting section 301 is threadedly connected to the internal thread anchor 403. The pull pin is placed through this operation hole and extends downward into the internal thread anchor to form a circumferential fixation. The connecting section is a hollow structure for placing or removing the pull pin through the operation hole. Inside the hollow structure, a turning block is fixedly provided. The turning block 3012 is provided with a through hole that is directly opposite to the pull pin in the length direction. The guy wire 8 passes through the through hole of the turning block 3012 and is connected to the pull pin 7, so that the pulling force of the guy wire 8 directly acting on the pull pin 7 is in the length direction, facilitating the pulling out of the pull pin.

[0026] The anchor cable 3 is sleeved with an isolation pipe 9. Generally, the isolation pipe 9 is made of PE pipe. The guy wire 7 is located inside the isolation pipe 9. After the pull pin is placed, the isolation pipe 9 is sleeved on the anchor cable 3 and its bottom end is connected to the bottom anchor head 4 to form a seal, which can be in the form of sealant glue or the like to ensure that the anchor cable will not be contaminated or cast by the anchor solid, enabling a smooth later recovery process.

[0027] In this embodiment, the bottom anchor head 4 further includes at least two anchor plates 401 and 402 arranged side by side in the length direction. The anchor plates 401 and 402 are fixedly connected by bolts 404. The internal thread anchor 403 is fixed to the anchor plates 401 and 402. A steel reinforcement cage 405 is welded to the anchor plates. The length of the steel reinforcement cage 405 corresponds to the anchor solid 5 formed in the anchoring hole. As shown in the figure, the internal thread anchor 403 is fixed between the anchor plates 401 and 402, which can be any mechanical fixing method in the prior art, including directly pressing and fixing with bolts 404, etc., and will not be elaborated here.

[0028] As shown in the figure, the outer anchor plate 401 is provided with a cable passing hole communicating with the internal thread anchor 403 for the connecting section 301 of the anchor cable 3 to pass through and be connected to the internal thread anchor 403, which will not be elaborated here. The steel reinforcement cage 405 is used to support the anchor cable 3 and to form an integral body with the anchoring section 6 to increase the anchoring strength.

[0029] As Figure 4 shown, when the present invention is used for anchoring, cast-in-place piles 1 and a water stop curtain 2 are poured around the foundation pit. The cast-in-place piles are poured with a capping beam and a waist beam. The anchoring assembly of the present invention is anchored through the capping beam and the waist beam.

[0030] After anchoring, the bottom anchoring head 4 is anchored in the anchor solid 5, and an enlarged end 6 is formed at the bottom end of the anchor solid 5 to increase the anchoring strength.

[0031] Before earthwork backfilling, manipulate the guy wire to pull out the pull pin from the internal thread anchor. Utilize the prestress of the cable anchor and the fact that the thread lead angle between the connecting section and the internal thread anchor is greater than the self-locking angle to make the connecting section disengage from the internal thread anchor, and then pull out the cable anchor after applying an external force.

[0032] As shown in the figure, the guy wire accompanies the cable anchor and extends out from the guy wire hole provided on the external anchor head. When it is necessary to pull out the pull pin, the cable anchor can be recovered by pulling it out with an external force. Of course, in order to prevent misoperation, a protection structure can be provided on the external anchor head, which will not be elaborated here.

[0033] Alternatively, before earthwork backfilling, disassemble the external anchor head to release the cable anchor, then manipulate the guy wire to pull out the pull pin from the internal thread anchor, and pull out the cable anchor after applying an external force, which can also achieve the purpose of the invention.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An anchoring assembly for a recyclable cable bolt, characterized in that: It includes a cable anchor, a pull pin and a bottom anchor head. The bottom anchor head includes an internal thread anchor with internal threads. The bottom end of the cable anchor is fixedly connected with a connecting section, and the connecting section is in threaded fit with the internal thread anchor. The lead angle of the thread is greater than the self-locking angle. The pull pin is inserted along the length direction into the connecting section and locks the internal thread anchor in the circumferential direction, and the pull pin can be pulled out to disengage and release the internal thread anchor.

2. The anchoring assembly of the recyclable cable anchor according to claim 1, wherein: The cross-section of the pull pin is polygonal. The internal thread anchor is provided with internal threads for connecting with the connecting section. A polygonal hole for cooperating with the pull pin is formed at the bottom of the internal threads. The connecting section is provided with a polygonal hole for cooperating with the pull pin.

3. The anchoring assembly of the recyclable cable anchor according to claim 2, characterized in that: The connecting section is further provided with an operation hole for placing and removing the pull pin. Along with the cable anchor, a guy wire is provided. One end of the guy wire passes through the operation hole and is fixedly connected to the pull pin, and the other end is exposed outside the outer anchor head during anchoring.

4. The anchoring assembly of the recyclable cable bolt according to claim 3, characterized in that: The cable anchor is sleeved with an isolation pipe, and the guy wire is located inside the isolation pipe.

5. The anchoring assembly of the recyclable cable anchor according to claim 4, characterized in that: The bottom anchor head further includes at least two anchor plates arranged side by side along the length direction. The anchor plates are fixedly connected by bolts, and the internal thread anchor is fixed to the anchor plates.

6. The anchoring assembly of the recyclable cable bolt according to claim 5, characterized in that: A steel reinforcement cage is welded and connected to the anchor plate. The length of the steel reinforcement cage corresponds to the anchor body during anchoring construction.

7. The anchoring assembly of the recyclable cable bolt according to claim 6, characterized in that: The bottom end of the isolation pipe forms a seal with the corresponding anchor plate.

8. The anchoring assembly of the recyclable cable anchor according to claim 4, characterized in that: The connecting section is a hollow structure. A turning block is fixedly arranged inside the hollow structure. The turning block is provided with a through hole that is directly opposite to the pull pin in the length direction. The guy wire passes through the through hole of the turning block and is connected to the pull pin.

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