High pre-tensioned cable

Abstract

The present application relates to high pre-tightening force anchor cable, belongs to the field of anchor cable. High pre-tightening force anchor cable, including anchor cable main part and sleeve with thread on outer circumferential surface, sleeve is fixedly sleeved on the outer circumferential surface of one end of anchor cable main part, still including tray, anchor nut and anti-twist rib, tray and anchor nut are sequentially sleeved on the outer circumferential surface of sleeve, anti-twist rib is also wound on sleeve, tray is located between anti-twist rib and anchor nut, anti-twist rib corresponds with the position of anchor hole orifice, and anti-twist rib and anchor hole adopt interference fit. When the device is used, when anchor nut rotates to locking direction, anti-twist rib wound on sleeve will be squeezed into anchor hole by tray, at this moment, interference fit exists between anti-twist rib and anchor hole, and because anti-twist rib is wound on sleeve, therefore, tight fit also exists between sleeve and anti-twist rib, so this can prevent anchor nut from rotating sleeve in the process of rotating to locking direction, thereby preventing anchor cable from twisting.

Description

TECHNICAL FIELD

[0001] The present application relates to high pre-tightening force anchor cable, belongs to the field of anchor cable. BACKGROUND

[0002] In the support of mine roof, generally anchor rod is used, in recent years, anchor cable is used in the mining and preparation roadway in China, at present, the anchor cable used in the support of mine is structured by steel cable, spherical tray, anchor set and tensioning device, the anchor cable is tensioned by tensioning device, and finally the anchor cable is fixed by anchor set; since tensioning device needs to be installed, the anchor hole of 200mm-300mm needs to be exposed during the installation of anchor cable, which will increase the height of roadway, and increase the cost of roadway excavation.

[0003] In order to overcome the problem of too long exposed length of anchor cable, another construction process of anchor cable is generally used: after the anchor hole is drilled, the anchor cable is inserted into the anchor hole, the end of the anchor cable abuts against the bottom of the anchor hole, the tray and anchor nut are sleeved on the anchor cable, the anchor nut is rotated in the locking direction, so as to tension the anchor cable; the anchor cable is formed by winding a plurality of steel strands, the anchor cable is difficult to resist the deformation caused by torsion, during the process of tensioning the anchor cable, that is, when the anchor nut is rotated in the locking direction, the sleeve will drive the anchor cable to twist, the anchor cable will be twisted and deformed, that is, the anchor cable is in the shape of a circular arc, the anchor cable is shortened, which will make the end of the anchor cable unable to abut against the bottom of the anchor hole when the pre-tightening force is increased, if the pre-tightening force is stopped, the anchor cable will rebound, that is, in the shape of a straight line, which will make the effect of pre-tightening force poor when the anchor cable is tensioned. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a high pre-tightening force anchor cable which reduces the risk of torsion of the anchor cable when the anchor nut is locked.

[0005] The technical scheme adopted by the present application to solve the technical problem is: a high pre-tightening force anchor cable, comprising an anchor cable body and a sleeve with threads on the outer periphery, the sleeve is fixedly sleeved on the outer periphery of one end of the anchor cable body, further comprising a tray, an anchor nut and an anti-twist rib, the tray and the anchor nut are sequentially sleeved on the outer periphery of the sleeve, the anti-twist rib is wound on the sleeve, the tray is located between the anti-twist rib and the anchor nut, the anti-twist rib corresponds to the position of the anchor hole, and the anti-twist rib and the anchor hole adopt interference fit.

[0006] Further, the anti-twist rib is in the shape of a tower spring, the small diameter end of the tower spring formed by the anti-twist rib is wound on the sleeve, and the large diameter end of the tower spring formed by the anti-twist rib is located on the side close to the tray.

[0007] Further, the interference amount between the anti-twist rib and the anchor hole is 1mm-5mm.

[0008] Further, the first end of the anchor cable body is away from the sleeve, and the anti-twist rib away from the tray extends to the side close to the first end and is wound on the anchor cable body.

[0009] Further, the anti-collapse nut is further provided, and the anchor nut is located between the anti-collapse nut and the tray.

[0010] Further, the anti-collapse line is further provided, and one end of the anti-collapse line is fixedly connected with the connecting hole.

[0011] Further, the connecting hole is a through hole penetrating the anti-collapse nut along the axial direction of the anchor cable.

[0012] Further, the aligning ball pad is further provided between the tray and the anchor cable, the inner wall of the central hole of the tray is matched with the outer circumferential surface of the aligning ball pad, and the bottom surface of the aligning ball pad is in abutment with the top surface of the anchor nut.

[0013] Further, the thrust bearing is further provided, and the thrust bearing is located between the aligning ball pad and the anchor nut.

[0014] The beneficial effects of the present application are as follows:

[0015] When the anchor nut is rotated in the locking direction, the anti-twist rib arranged on the sleeve is extruded into the anchor hole by the tray, at this time, the anti-twist rib and the anchor hole are in interference fit, and since the anti-twist rib is arranged on the sleeve, the sleeve and the anti-twist rib are also in close fit, so that the sleeve is prevented from rotating during the rotation of the anchor nut in the locking direction, thereby preventing the anchor cable from being twisted. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a structural schematic diagram of the present application;

[0017] Figure 2 The figure is a sectional view along the line B-B of the present application;

[0018] Figure 3 The figure is a schematic diagram of the arrangement of the anti-twist rib of the present application;

[0019] Figure 4 The figure is a structural schematic diagram of the anti-collapse nut of the present application.

[0020] In the figure, 1 is the anchor cable body, 2 is the sleeve, 3 is the tray, 4 is the aligning ball pad, 5 is the thrust bearing, 6 is the anchor nut, 7 is the anti-collapse nut, 72 is the connecting hole, 8 is the anti-collapse line, 9 is the anti-twist rib, and 10 is the anchor hole. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0022] Therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but merely represents some embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0023] As shown in the drawings, Figures 1 to 2 The high-pre-tightening force anchor cable of the present application comprises an anchor cable body 1 and a sleeve 2 with threads arranged on the outer periphery, the sleeve 2 is fixedly sleeved on the outer periphery of one end of the anchor cable body 1, further comprises a tray 3, an anchor nut 6 and an anti-twist rib 9, the tray 3 and the anchor nut 6 are sequentially sleeved on the outer periphery of the sleeve 2, the anti-twist rib 9 is further wound on the sleeve 2, the tray 3 is located between the anti-twist rib 9 and the anchor nut 6, the anti-twist rib 9 corresponds to the position of the hole of the anchor hole 10, and the anti-twist rib 9 and the anchor hole 10 are in interference fit.

[0024] Specifically, the outer diameter of the sleeve 2 is d1, the outer diameter of the anti-twist rib 9 is d2, d1+2d2=d3, the inner diameter of the anchor hole 10 is d, d is slightly smaller than d3, in use, when the anchor nut 6 rotates in the locking direction, the anti-twist rib 9 wound on the sleeve 2 will be squeezed into the anchor hole 10 by the tray 3, at this time, the anti-twist rib 9 and the anchor hole 10 are in interference fit, and since the anti-twist rib 9 is wound on the sleeve 2, the sleeve 2 and the anti-twist rib 9 are also in tight fit, so as to prevent the sleeve 2 from rotating with the anchor nut 6 during the rotation of the anchor nut 6 in the locking direction, thereby preventing the anchor cable from twisting; the anchor cable is formed by winding a plurality of steel strands, and the anchor cable is difficult to resist the deformation caused by twisting; therefore, if the present scheme is not provided, during the process of increasing the pre-tightening force, that is, when the anchor nut 6 rotates in the locking direction, the sleeve 2 will twist the anchor cable, the anchor cable will be twisted and deformed, that is, the anchor cable is in a circular arc shape and the anchor cable is shortened, so that the end of the anchor cable cannot abut against the bottom of the anchor hole 10 when the pre-tightening force is increased, if the pre-tightening force is stopped, the anchor cable will rebound, that is, in a straight line, so that the effect of applying the pre-tightening force is poor.

[0025] The anti-twist rib 9 can be selected from steel bars, steel pipes or iron pipes, etc.

[0026] As shown in the drawings, Figure 3 Preferably, the anti-twist rib 9 is in the shape of a tower spring, the small-diameter end of the tower spring formed by the anti-twist rib 9 is wound on the sleeve 2, and the large-diameter end of the tower spring formed by the anti-twist rib 9 is located on the side close to the tray 3.

[0027] Specifically, the scheme makes the anti-twist rib 9 form a tower spring shape, so that the interference between the anti-twist rib 9 and the anchor hole 10 gradually increases during the process of extruding into the anchor hole 10, which can effectively prevent the anchor cable from twisting; the gradually increasing interference between the anti-twist rib 9 and the anchor hole 10 can also facilitate the tray 3 to press the anti-twist rib 9 into the anchor hole 10; if the anti-twist rib 9 wound on the sleeve 2 is in a spiral spring shape, the interference between the anti-twist rib 9 and the anchor hole 10 cannot gradually increase, and the interference between the anti-twist rib 9 and the anchor hole 10 can only be fixed, if the interference is small, the anti-twist rib 9 can prevent the anchor cable from twisting in the anchor hole 10 to a certain extent, but the anchor cable still has the possibility of twisting in the anchor hole 10, that is, the anti-twist effect is not optimal; if the interference is large, the anti-twist rib 9 is not easy to enter the anchor hole 10, which will increase the construction difficulty.

[0028] Preferably, the interference between the anti-twist rib 9 and the anchor hole 10 is 1mm-5mm. Specifically, when the interference of the anti-twist rib 9 is less than 1mm, the anti-twist effect is not good; when the interference of the anti-twist rib 9 is greater than 5mm, the anti-twist rib 9 is not easy to enter the anchor hole 10, which will increase the construction difficulty.

[0029] Preferably, the end of the anchor cable body 1 away from the sleeve 2 is the first end, the end of the anti-twist rib 9 away from the tray 3 extends towards the side close to the first end and is wound on the anchor cable body 1. Specifically, the scheme limits the winding of the anti-twist rib 9 on the sleeve 2 and the anchor cable body 1, and the winding of the anti-twist rib 9 on the anchor cable can prevent the risk of the anti-twist rib 9 falling off the sleeve 2 during transportation.

[0030] As shown in Figure 4 Preferably, it also includes an anti-collapse nut 7 threadedly connected with the sleeve 2, the anchoring nut 6 is located between the anti-collapse nut 7 and the tray 3, and the anti-collapse nut 7 is provided with a connecting hole 72 for connecting the anti-collapse wire 8.

[0031] The anti-collapse nut 7 of the device is provided with a connecting hole 72, one end of the anti-collapse wire 8 is fixedly connected to the connecting hole 72, and the other end of the anti-collapse wire 8 can be fixedly connected with the top plate metal mesh during use. A certain safety buffer distance is provided between the anti-collapse nut 7 and the anchoring nut 6, the anti-collapse nut 7 is used to prevent the anchoring nut 6 from collapsing, that is, to prevent the anchoring nut 6 from bouncing off the anchoring device 1, which can reduce the risk of the anchoring nut 6 collapsing and injuring the workers, and the anti-collapse wire 8 of the device is directly fixedly connected to the connecting hole 72 of the anti-collapse nut 7, so that the anchoring nut 6 will not cause the anti-collapse wire 8 to fail during the retraction process, therefore, when the anchoring device 1 breaks, the anti-collapse wire 8 can bind the broken anchoring device 1, reducing the risk of injury to the construction personnel;

[0032] In addition, the invention patent with the publication number CN111156042B discloses a rock burst prevention mechanism for a rock burst roadway anchor rod; the prevention mechanism still has the following problems: since the suspending and pulling component and the deceleration component are hung on the rod body of the anchor rod through the snap ring, when the anchor rod is broken between the first torque nut and the second torque nut, the broken anchor rod will be separated from the restraint of the snap ring, and the broken anchor rod will still burst out, which has the risk of injuring the workers; and the device directly connects the prevention line 8 to the connecting hole 72 of the prevention nut 7, and the prevention nut 7 is connected to the anchoring piece 1 through threads, so that the prevention line 8 and the anchoring piece 1 form an integral whole; when the anchoring piece 1 is broken between the anchoring nut 6 and the prevention nut 7, the prevention line 8 can still restrain the broken anchoring piece 1, so as to reduce the risk of injuring the workers.

[0033] If the connecting hole 72 is directly arranged at the tail of the anchoring piece 1 for connecting the prevention line 8, the strength of the anchoring piece 1 will be reduced, and stress concentration will be generated at the connecting hole 72, so that the tail rod body of the anchoring piece 1 is more prone to be broken, which has a huge safety hazard, causes the failure of the prevention device, and also affects the service life of the anchoring piece 1; in addition, the original design strength of the anchoring piece 1 is reduced due to the connecting hole 72, which is inconsistent with the original support design and procedure measures.

[0034] Preferably, the device further comprises a prevention line 8, one end of the prevention line 8 being fixedly connected to the connecting hole 72. Specifically, the prevention line 8 can be a steel wire or the like.

[0035] Preferably, the connecting hole 72 is a through hole penetrating through the prevention nut 7 along the axial direction of the anchor cable. Specifically, a ring-shaped ear plate can be welded on the prevention nut 7, and the connecting hole 72 is a hole on the ring-shaped ear plate.

[0036] Preferably, a self-aligning ball pad 4 is further arranged between the tray 3 and the anchor cable, the inner wall of the center hole of the tray 3 is matched with the outer circumferential surface of the self-aligning ball pad 4, and the bottom surface of the self-aligning ball pad 4 abuts against the top surface of the anchoring nut 6. Specifically, the position of the anchoring piece 1 in the vertical direction can be adjusted through the self-aligning ball pad 4.

[0037] Preferably, the device further comprises a thrust bearing 5 sleeved on the anchor cable, the thrust bearing 5 is located between the self-aligning ball pad 4 and the anchoring nut 6, the top surface of the thrust bearing 5 abuts against the bottom surface of the self-aligning ball pad 4, and the bottom surface of the thrust bearing 5 abuts against the top surface of the anchoring nut 6. Specifically, the anchoring piece 1 needs to bear a large axial load during the pre-tightening process, and the thrust bearing 5 can bear the axial load; the thrust bearing 5 converts the static friction of the conventional anchoring into rolling friction during the pre-tightening process of the anchoring nut 6, and based on the rolling friction principle, the pre-tightening force can be greatly improved compared with the plane friction of the prior art.

[0038] In the description of the application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, or the orientation or positional relationship commonly understood by those skilled in the art, such terms are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In this paper, "parallel", "vertical" and the like are not strictly limited in the mathematical and / or geometric sense, but also include errors allowed by those skilled in the art in manufacturing or use. It should be noted that the embodiments of the application and the features and technical solutions in the embodiments can be combined with each other without conflict.

Claims

1. High preload anchor cable, characterized by: The invention comprises an anchor cable body (1) and a sleeve (2) with a threaded outer surface, wherein the sleeve (2) is fixedly sleeved on the outer surface of one end of the anchor cable body (1), and further comprises a tray (3), an anchor nut (6) and an anti-torsion rib (9), wherein the tray (3) and the anchor nut (6) are sleeved on the outer surface of the sleeve (2) in sequence, and an anti-torsion rib (9) is further wound around the sleeve (2), wherein the tray (3) is located between the anti-torsion rib (9) and the anchor nut (6), wherein the anti-torsion rib (9) corresponds to the position of the opening of the anchor hole (10), and an interference fit is adopted between the anti-torsion rib (9) and the anchor hole (10); The anti-torsion rib (9) is in the shape of a tower spring, the small diameter end of the tower spring formed by the anti-torsion rib (9) is wound around the sleeve (2), and the large diameter end of the tower spring formed by the anti-torsion rib (9) is located on a side close to the tray (3).

2. The high preload anchor cable according to claim 1, characterized in that: The interference between the anti-torsion reinforcement (9) and the anchor hole (10) is 1 mm to 5 mm.

3. The high preload anchor cable according to claim 1, characterized in that: The end of the anchor cable body (1) away from the sleeve (2) is the first end, and the end of the anti-torsion reinforcement (9) away from the tray (3) extends toward a side close to the first end and is wound around the anchor cable body (1).

4. The high preload anchor cable according to any one of claims 1 to 3, characterized in that: It also includes an anti-collapse nut (7) threadedly connected to the sleeve (2), the anchor nut (6) is located between the anti-collapse nut (7) and the tray (3), and the anti-collapse nut (7) is provided with a connection hole (72), and the connection hole (72) is used to connect the anti-collapse line (8).

5. The high preload anchor cable according to claim 4, characterized in that: It also includes an anti-collapse line (8), one end of which is fixedly connected to the connection hole (72).

6. The high preload anchor cable according to claim 4, characterized in that: The connecting hole (72) is a through hole that penetrates the anti-collapse nut (7) along the axial direction of the anchor cable.

7. The high preload anchor cable according to claim 4, characterized in that: A centering ball pad (4) is further provided between the tray (3) and the anchor cable, the inner wall of the center hole of the tray (3) is adapted to the outer peripheral surface of the centering ball pad (4), and the bottom surface of the centering ball pad (4) abuts against the top surface of the anchor nut (6).

8. The high preload anchor cable according to claim 7, characterized in that: It also includes a thrust bearing (5) sleeved on the anchor cable, the thrust bearing (5) being located between the self-aligning ball pad (4) and the anchor nut (6), the top surface of the thrust bearing (5) abutting against the bottom surface of the self-aligning ball pad (4), and the bottom surface of the thrust bearing (5) abutting against the top surface of the anchor nut (6).

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