Recyclable Anchoring Assembly for Prefabricated Concrete Bottom Anchor Head

Abstract

The present invention discloses a recyclable anchoring assembly for a precast concrete bottom anchor head, which includes a cable anchor, a pull pin and a bottom anchor head. The bottom anchor head includes an anchor head body formed by concrete casting and an internally threaded anchor embedded in the anchor head body. The bottom end of the cable anchor is fixedly connected with a connecting section, and the connecting section is in threaded fit with the internally threaded 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 internally threaded anchor is locked in the circumferential direction, and the pull pin can be pulled out and disengaged to release the internally threaded anchor; when combined with the casting of the anchor solid, the present invention is relatively firm and the casting is thorough, avoiding the occurrence of an overhead condition, thereby ensuring the bearing capacity after anchoring. At the same time, the recovery operation of the cable anchor is simple and convenient, improving the construction efficiency, and the foundation pit support is firm during anchoring, 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 a recyclable anchoring assembly for a precast concrete bottom anchor head. Background Art

[0002] Temporary support is a relatively common safety protection measure in construction, which is realized by cable anchor. Since it is a temporary support, usually the cable anchor cannot be recycled after the support function fails, and it is buried underground together with the structure, forming underground garbage and causing underground environmental pollution, which has 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, recyclable cable anchors have emerged in the prior art. The connectors and anchor fittings of the anchoring section of the recyclable cable anchor 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 recycling the cable anchor, a rotational force is applied to the cable anchor to separate it from the threaded connection or the swivel structure, and it is pulled out by an external force to complete the recycling of the cable anchor.

[0004] During actual construction, the bottom end of the cable anchor is connected to the anchor head by a threaded connection. Since prestress needs to be applied later to achieve anchoring, the thread lead angle 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 cable anchor cannot be rotated during recycling. Moreover, applying an external force to transfer the torsional moment to the bottom also has high requirements for the cable anchor, so the cost will also increase.

[0005] At the same time, the anchor head is generally formed of steel structure. Commonly, there is an anchor plate at each end, which are connected by bolts and the internal thread anchor is pressed in the middle. After entering the bottom end of the anchor hole, it is cast integrally with the anchor body. During the construction process, it is not easy to pour the anchor head thoroughly during the casting of the anchor body (especially the high-pressure jet grouting process), so its bearing capacity cannot be fully exerted.

[0006] Therefore, it is necessary to improve the existing recyclable cable anchor structure, so that the anchor head and the anchor body are combined completely and tightly to ensure the bearing capacity, and the recycling operation of the cable anchor is simple and convenient, and the foundation pit is firmly supported during anchoring, and the requirement for the cable anchor to transfer the torsional moment is not high, so as to finally achieve the purpose of reducing the construction cost and improving the construction efficiency. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a recyclable anchoring assembly for a precast concrete bottom anchor head, in which the anchor head and the anchor body are combined completely and tightly to ensure the bearing capacity, and the recycling operation of the cable anchor is simple and convenient, and the foundation pit is firmly supported during anchoring, and the requirement for the cable anchor to transfer the torsional moment is not high, so as to finally achieve the purpose of reducing the construction cost and improving the construction efficiency.

[0008] The recyclable anchoring assembly of the precast concrete bottom anchor head of the present invention includes a cable anchor, a pull pin, and a bottom anchor head. The bottom anchor head includes an anchor head body formed by concrete casting and an internally threaded anchor embedded in the anchor head body. The bottom end of the cable anchor is fixedly connected with a connecting section, and the connecting section is in threaded cooperation with the internally threaded anchor. The lead angle of the thread is greater than the self-locking angle.

[0009] The pull pin is inserted along the length direction into the connecting section and locks the internally threaded anchor in the circumferential direction, and the pull pin can be pulled out and disengaged to release the internally threaded anchor.

[0010] Further, the anchor head body includes a steel structure framework and columnar concrete cast on the steel structure framework, and the internally threaded anchor is welded to the steel structure framework.

[0011] Further, a plurality of shear studs extend outward from the columnar concrete, and the shear studs are welded to the steel structure framework or integrally extend outward from the steel structure framework.

[0012] Further, the cross section of the pull pin is polygonal. The internally threaded anchor is provided with an internal thread for connecting with the connecting section, and a polygonal hole 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.

[0013] Further, the connecting section is also provided with an operation hole for placing and removing the pull 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 pull pin, and the other end is exposed outside the outer anchor head during anchoring.

[0014] Further, the cable anchor is sleeved with an isolation tube, and the pull wire is located inside the isolation tube.

[0015] Further, the bottom end of the isolation tube forms a seal with the anchor head body.

[0016] Further, 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 pull pin in the length direction, and the pull wire passes through the through hole of the turning block and is connected to the pull pin.

[0017] Further, the shear stud is a transverse plate-like structure.

[0018] Advantages of the present invention: The recyclable anchoring assembly of the precast concrete bottom anchor head of the present invention adopts an anchor head structure made of precast concrete, which is relatively firm and thoroughly poured when combined with the anchor body by casting, avoiding the occurrence of overhead conditions, thereby ensuring the bearing capacity after anchoring. At the same time, it adopts a large lead angle thread connection combined with the locking function of the pull pin in the circumferential direction. When recovering the anchor cable, the pull pin can be pulled out, and the recovery operation of the anchor cable is simple and convenient, improving the construction efficiency. Moreover, during anchoring, the foundation pit support is firm, and the requirement for the anchor cable to transmit the torsional moment is not high, ultimately achieving the purpose of reducing construction costs and improving construction efficiency. Brief Description of the Drawings

[0019] The present invention will be further described below with reference to the drawings and embodiments.

[0020] Figure 1 It is a schematic structural diagram of the present invention;

[0021] Figure 2 is Figure 1 an enlarged view of part A of

[0022] Figure 3 It is a cross-sectional view of the bottom anchor head;

[0023] Figure 4 It is a schematic diagram of the support structure formed by the present invention. Detailed Embodiment

[0024] As Figures 1-4 shown: The recyclable anchoring assembly of the precast concrete bottom anchor head of this embodiment includes an anchor cable 3, a pull pin 7, and a bottom anchor head 4. The bottom anchor head 4 includes an anchor head body formed by concrete casting and an internally threaded anchor 403 embedded in the anchor head body. 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 internally threaded 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 (in the length direction) is applied;

[0025] The pin pulling member 7 is inserted into the connecting section 301 along the length direction and locks the internal thread anchor 403 in the circumferential direction, and the pin pulling member 7 can be pulled out to release the internal thread anchor 403; during anchoring, the pin pulling member 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 cable anchor 3 needs to be recovered, the pin pulling member 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 thread lead angle is greater than the self-locking angle, the cable anchor 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 pin pulling member, the lead angle can be much greater than the self-locking angle, and the cable anchor can be conveniently pulled out after the pin pulling member releases the lock;

[0026] The bottom anchor head of this embodiment is prefabricated and formed by concrete pouring, which avoids the problem of incomplete pouring when entering the anchor body and combining with the anchor body, thereby increasing the bonding force and ensuring the anchoring quality; at the same time, the internal thread anchor is embedded in the concrete to realize the recoverable cable anchor structure. The overall structure requires less steel material, saving costs and reducing environmental pollution.

[0027] In this embodiment, the anchor head body includes a steel structure framework 402 and a columnar concrete 401 poured on the steel structure framework, and the internal thread anchor 403 is welded to the steel structure framework; this ensures the overall tensile strength of the anchor head body and is used to support the internal thread anchor.

[0028] In this embodiment, the columnar concrete 401 extends outwardly with a plurality of shear studs 404, and the shear studs 404 are welded to the steel structure framework or integrally extend outward from the steel structure framework 402, generally adopting an integrally formed structure; in this structure, the anchor body only needs to be combined with the shear studs on the outer circle of the columnar concrete, and there is no problem of being suspended in the air. The shear studs are finally used to be poured into the anchor body to ensure the good combination of the anchor head body and the anchor body and ensure the anchoring strength; the shear studs are provided with nail caps to increase the anti-pulling and anti-shearing capabilities of the anchored structure after pouring and forming; as shown in the figure, as shown in the figure, the steel framework includes an annular steel ring and radial rods distributed radially. The internal thread anchors are three and are evenly distributed in the circumferential direction and are vertical steel members at the same time. The annular steel rings are two and are respectively on the inner side and the outer side of the internal thread anchor and are welded to it. The radial rods extend radially outward from the concrete column to form the shear studs; the radial inner and outer sides here refer to the radial direction of the concrete column, which will not be elaborated here.

[0029] In this embodiment, the cross-section of the pin 7 is polygonal. The internal thread anchor is provided with an internal thread for connecting with the connecting section. The bottom of the internal thread forms a polygonal hole 4031 that cooperates with the pin. The connecting section is provided with a polygonal hole for cooperating with the pin. As shown in the figure, grease is applied to the pin and the thread pair during use to ensure smooth extraction later. The polygonal structure makes the force transmission of the pin reliable, has more force-bearing surfaces, and has better load-bearing capacity.

[0030] In this embodiment, the connecting section 301 is further provided with an operation hole 3011 for placing and removing the pin. Along with the anchor cable 3, a pull wire 8 is provided. The pull wire 8 generally uses steel wire or thin steel strand. One end of the pull wire 8 passes through the operation hole 3011 and is fixedly connected to the pin 7, which can be achieved through existing mechanical connection structures. 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 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 pin through the operation hole. A turning block is fixedly provided inside the hollow structure. The turning block 3012 is provided with a through hole that is directly opposite to the pin in the length direction. The pull wire 8 passes through the through hole of the turning block 3012 and is connected to the pin 7, so that the pulling force of the pull wire 8 directly acting on the pin 7 is in the length direction, which is convenient for pulling out the pin.

[0031] The anchor cable 3 is sleeved with an isolation tube 9. Generally, the isolation tube 9 uses a PE tube. The pull wire 7 is located inside the isolation tube 9. After the pin is placed, the isolation tube 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 achieved by using sealant or other forms to ensure that the anchor cable will not be contaminated or cast by the anchoring body, so that the later recovery process can proceed smoothly.

[0032] In this embodiment, the shear stud is a transverse plate-like structure. The transverse plate-like structure refers to a plate-like structure perpendicular to the plane in the length direction. The shear stud (including the stud cap) of this structure can increase the contact area with the anchoring body in the anti-pulling direction, thereby increasing the load-bearing capacity.

[0033] 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.

[0034] After anchoring, the bottom anchor head 4 is anchored in the anchoring body 5, and an enlarged end 6 is formed at the bottom end of the anchoring body 5 to increase the anchoring strength.

[0035] Before the earthwork backfilling, control the pull wire to pull out the pull pin from the internal thread anchor, and utilize the prestress of the anchor cable 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 anchor cable after applying an external force;

[0036] As shown in the figure, the pull wire accompanies the anchor cable and extends out from the pull wire hole provided on the external anchor head. When the pull pin needs to be pulled out, it can be achieved by applying an external force to recover the anchor cable; of course, in order to prevent misoperation, a protection structure can be provided on the external anchor head, which will not be elaborated here;

[0037] Alternatively, before the earthwork backfilling, after disassembling the external anchor head to release the anchor cable, control the pull wire to pull out the pull pin from the internal thread anchor, and then pull out the anchor cable after applying an external force, which can also achieve the purpose of the invention.

[0038] 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. A recyclable anchoring assembly for a precast concrete bottom anchor head, Characterized in that: It includes a cable anchor, a pull pin and a bottom anchor head. The bottom anchor head includes an anchor head body formed by concrete casting and an internally threaded anchor embedded in the anchor head body. The bottom end of the cable anchor is fixedly connected with a connecting section, and the connecting section is in threaded cooperation with the internally threaded 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 internally threaded anchor in the circumferential direction, and the pull pin can be pulled out and disengaged to release the internally threaded anchor.

2. The recyclable anchoring assembly for a precast concrete bottom anchor head according to claim 1, Characterized in that: The anchor head body includes a steel structure framework and columnar concrete cast on the steel structure framework, and the internally threaded anchor is welded to the steel structure framework.

3. The recyclable anchoring assembly for a precast concrete bottom anchor head according to claim 2, Characterized in that: The columnar concrete extends outwardly with a number of shear studs, and the shear studs are welded to the steel structure framework or integrally extend outwardly from the steel structure framework.

4. The recyclable anchoring assembly for a precast concrete bottom anchor head according to claim 1, Characterized in that: The cross-section of the pull pin is polygonal. The internally threaded anchor is provided with an internal thread for connecting with the connecting section. A polygonal hole for cooperating with the pull pin is formed at the bottom of the internal thread, and the connecting section is provided with a polygonal hole for cooperating with the pull pin.

5. The recyclable anchoring assembly for a precast concrete bottom anchor head according to claim 4, 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 pull wire is provided. One end of the pull 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.

6. The recyclable anchoring assembly for a precast concrete bottom anchor head according to claim 5, Characterized in that: The cable anchor is sleeved with an isolation tube, and the pull wire is located inside the isolation tube.

7. The recyclable anchoring assembly for a precast concrete bottom anchor head according to claim 6, Characterized in that: The bottom end of the isolation tube forms a seal with the anchor head body.

8. The recyclable anchoring assembly for a precast concrete bottom anchor head according to claim 4, Characterized in that: The connecting section is a hollow structure, and a steering block is fixedly arranged inside the hollow structure. The steering block is provided with a through hole facing the pull pin in the length direction, and the pull wire passes through the through hole of the steering block and is connected to the pull pin.

9. The recyclable anchoring assembly for a precast concrete bottom anchor head according to claim 3, Characterized in that: The shear stud is a transverse plate-like structure.

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