An impact-resistant tunnel support anchor cable

Abstract

The present invention relates to an impact-resistant tunnel support anchor cable, comprising an anchor cable body, wherein the front end of the anchor cable body is provided with an anti-slip device, wherein the anti-slip device comprises a shell and a rotating wheel, and the shell is coaxially fixedly connected with the anchor cable body. The end surface of the shell is provided with a plurality of grooves distributed in a circular array around its axis, and the rotating wheel is rotatably arranged inside the groove, and the rotating wheel part is leaked to the outside of the shell. The rotating wheel rotates only when the anchor cable body moves forward, and the rotating wheel cannot rotate when the anchor cable body moves backward. During the installation process of the anchor cable, the present invention can position and fix the anchor cable through the support plate and the roller if it is installed vertically or obliquely upward as expected, so as to prevent it from slipping out of the drill hole.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel support anchor cables, and in particular relates to an impact-resistant tunnel support anchor cable. Background Art

[0002] Tunnel anchor cables include prestressed anchors that are used to fix the ends of the anchor cables and transfer prestressed force to the anchoring points. The anchor cables constitute the main body of the anchor cables and provide tension and support for the steel wire ropes or steel strands. They are usually tubular components made of metal and are used to fix the anchor cables to foundation objects such as rock or concrete.

[0003] When using anchor cables, you need to first drill holes in the rock wall or concrete structure inside the tunnel, ensure that the size and position of the holes meet the design requirements, and clean the gravel and dust inside the holes. Insert the anchor sleeve into the drilled hole and fix it firmly in the hole by appropriate methods, ensuring that the gap between the anchor sleeve and the hole wall meets the design requirements.

[0004] The prefabricated anchor cable is introduced into the hole through the anchor sleeve, and the anchor cable is stretched and adjusted according to the design requirements to ensure that the position and tension of the anchor cable meet the design requirements. Use appropriate grouting materials (such as anchor glue) to fill the gaps in the hole, and ensure that the anchor cable and anchor sleeve are fully wrapped and fixed. The curing process is completed after the grouting solidifies to the designed strength.

[0005] During the installation of anchor cables, after the vertical or inclined upward drilling holes are filled with grouting materials, since it takes a certain amount of time for the grouting materials to harden, the anchor cables may sometimes slip out of the drilling holes for a certain distance, affecting the overall anchoring quality. Summary of the invention

[0006] The technical problem to be solved by the present invention is: to overcome the shortcomings of the prior art and provide an impact-resistant tunnel support anchor cable. During the installation of the anchor cable, the present invention is installed vertically or inclined upward as expected. Through the support plate and rollers, the anchor cable can be positioned and fixed to prevent it from slipping out of the drill hole.

[0007] The technical solution adopted by the present invention to solve the problems existing in the prior art is:

[0008] An impact-resistant tunnel support anchor cable comprises an anchor cable body. The front end of the anchor cable body is provided with an anti-slip device. The anti-slip device comprises a shell and a rotating wheel. The shell is coaxially fixedly connected to the anchor cable body.

[0009] The end surface of the shell is concavely provided with a plurality of grooves distributed in a ring array around its axis, the runner is rotatably arranged inside the groove, and part of the runner leaks out of the shell.

[0010] The rotating wheel rotates only when the anchor cable body moves forward, and the rotating wheel cannot rotate when the anchor cable body moves backward.

[0011] Preferably, a rotating groove which is connected to the groove is provided inside the shell, and the rotating shaft of the rotating wheel is rotatably arranged inside the rotating groove.

[0012] A limiting block is convexly arranged on the circumferential surface of the rotating shaft, one side of the limiting block is an arc surface and the other side is a vertical surface.

[0013] A spring cavity is connected through the radial direction of the rotating groove, and a top block and a spring are arranged inside the spring cavity. The spring pushes the top block to always abut against the circumferential surface of the rotating shaft.

[0014] After the arc surface of the limit block collides with the top block, the top block can be pushed down without affecting the rotation of the shaft;

[0015] After the vertical surface of the limit block collides with the top block, the top block clamps the limit block to limit the rotation of the shaft.

[0016] Preferably, an arc-shaped abutting surface is provided between the arc-shaped surface and the vertical surface of the limiting block, the outer diameter of the abutting surface is the same as the inner diameter of the rotating groove, and the abutting surface abuts against the inner wall of the rotating groove.

[0017] Preferably, a conical head is coaxially arranged at the front end of the shell.

[0018] Preferably, the cross-sectional shape of the shell is hexagonal, the wheels are arranged on three end faces spaced apart from each other, a support plate is provided on the end face of the shell between two adjacent wheels, the front end of the support plate is hinged to the shell, an elastic device is connected to the support plate, and the elastic device causes the support plate to rotate toward the outside of the shell.

[0019] Preferably, the elastic device is a torsion spring, which is sleeved on the hinge shaft of the support plate, and two ends of the torsion spring are fixedly connected to the support plate and the shell respectively.

[0020] Preferably, a glue spraying device is provided on the anchor cable body, the inside of the glue spraying device is filled with anchoring glue, and a plurality of spray holes are provided on the circumferential surface of the glue spraying device. After the anchor cable body is installed in place inside the drilled hole, the anchoring glue is sprayed out through the spray holes.

[0021] Preferably, the glue spraying device comprises a shell, which is mounted on the anchor cable body, a glue cavity is provided inside the shell, the anchor glue is filled inside the glue cavity, and a spray hole is provided on the outer circumferential surface of the shell, and the anchor glue is caused to spray out through the spray hole by air pressure.

[0022] Preferably, an annular airbag is provided inside the glue cavity, the airbag is located inside, the anchoring glue is filled between the airbag and the outer wall of the casing, and an air pipe is connected to the outside of the airbag, and the air pipe is arranged along the anchor cable body.

[0023] Preferably, a sealing device is provided on the spray hole, and the sealing device is opened by pressure-increasing control, and the anchoring glue is sprayed out from the spray hole after the sealing device is opened.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) After the anchor cable is installed inside the borehole, the limiting wheel and the open support plate are used to prevent the anchor cable from slipping out of the borehole during the period when the anchoring agent has not solidified, thereby ensuring the anchoring effect.

[0026] (2) The anchoring agent is sprayed directly from the spray hole of the glue spraying device, ensuring the grouting effect at all positions of the borehole. Especially for long boreholes, grouting only through the borehole mouth makes it difficult to grout evenly and thoroughly in deeper areas or when there are obstructions in the middle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 This is the first structural diagram of an impact-resistant tunnel support anchor cable of the present invention.

[0029] Figure 2 This is a structural diagram of the front end anti-slip device of the present invention.

[0030] Figure 3 for Figure 2 The first cross-sectional view of

[0031] Figure 4 for Figure 2 The second cross-sectional view of

[0032] Figure 5 for Figure 2 The third cross-sectional view of

[0033] Figure 6 for Figure 5 A partial enlarged view of the middle A.

[0034] Figure 7 for Figure 2 The effect diagram after the support plate is unfolded.

[0035] Figure 8 This is a structural diagram of the glue spraying device of the present invention.

[0036] Fig. 9 for Figure 8 A cross-sectional view of

[0037] Fig.10 This is the second structural diagram of an impact-resistant tunnel support anchor cable of the present invention.

[0038] Fig.11 for Fig.10 The rear view of

[0039] Fig.12 The third structural diagram of an impact-resistant tunnel support anchor cable of the present invention.

[0040] In the figure: 1-anchor cable body, 2-shell, 201-conical head, 202-rotating groove, 203-spring chamber, 3-connecting sleeve, 4-rotating wheel, 401-rotating shaft, 402-limiting block, 5-top block, 6-spring, 7-support plate, 8-locking plate, 9-shell, 901-rubber chamber, 902-spray hole, 10-sealing device, 11-air bag, 12-trachea. DETAILED DESCRIPTION

[0041] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.

[0042] In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The impact-resistant tunnel support anchor cable of the present invention is further described in detail below in conjunction with the accompanying drawings, but this is not intended to limit the present invention.

[0045] An impact-resistant tunnel support anchor cable comprises an anchor cable body 1. A prestressed anchor is arranged at the end of the anchor cable body 1 and an anti-slip device is arranged at the front end. The anchor cable body 1 is made of steel wire rope or steel strand.

[0046] The anti-slip device comprises a housing 2 and a rotating wheel 4, wherein the housing 2 is coaxially fixedly connected to the anchor cable body 1. The end surface of the housing 2 is provided with a plurality of grooves distributed in a circular array around its axis, and the rotating wheel 4 is rotatably arranged inside the grooves, and a part of the rotating wheel 4 leaks out of the housing 2.

[0047] The wheel 4 rotates only when the anchor cable body 1 moves forward. When the anchor cable body moves backward, the wheel 4 cannot rotate. During the installation of the anchor cable, the outer diameter of the anchor cable body 1 is smaller than the inner diameter of the borehole, and the circumferential surface of the wheel 4 abuts against the inner wall of the borehole. When the anchor cable body 1 is inserted into the borehole, the anti-slip device moves to the front end, and the wheel 4 rolls to reduce the friction. When the anchor cable body 1 wants to slide out of the borehole and move backward, the wheel 4 is stuck and cannot rotate, which increases the friction of the anchor cable body 1 moving backward. Under the action of the friction, the anchor cable body 1 is fixed.

[0048] In order to increase the friction of the runner 4, the runner 4 adopts a rubber tire with high friction.

[0049] In order to achieve the locking function of the rotating direction of the rotating wheel 4, in this embodiment, the two axial ends of the rotating wheel 4 are respectively fixedly connected with a rotating shaft 401. The housing 2 is provided with a rotating groove 202 connected to the groove, and the rotating shaft 401 of the rotating wheel 4 is rotatably arranged inside the rotating groove 202.

[0050] A limit block 402 is convexly disposed on the circumferential surface of the rotating shaft 401 , and one side of the limit block 402 is an arc surface and the other side is a vertical surface.

[0051] A spring cavity 203 is connected through the rotating groove 202 in the radial direction. A top block 5 and a spring 6 are arranged inside the spring cavity 203 . The spring 6 pushes the top block 5 to always contact the circumferential surface of the rotating shaft 401 .

[0052] After the arc surface of the limit block 402 collides with the top block 5, the top block 5 can be pushed downward without affecting the rotation of the shaft 401; after the vertical surface of the limit block 402 collides with the top block 5, the top block 5 clamps the limit block 402 to limit the rotation of the shaft 401.

[0053] In order to improve the supporting effect of the limit block 402 on the rotating shaft 401, an arc-shaped abutting surface is provided between the arc surface and the vertical surface of the limit block 402, and the outer diameter of the abutting surface is the same as the inner diameter of the rotating groove 202, and the abutting surface abuts against the inner wall of the rotating groove 202. At the same time, at least three limit blocks 402 are arranged on the circumferential surface of the rotating shaft 401 and are distributed in a ring array around its axis.

[0054] The front end of the housing 2 is coaxially provided with a conical head 201. The outer diameter of the large end of the conical head 201 is the same as the outer diameter of the housing 2, so that when the anchor cable body 1 is inserted into the borehole, the conical head 201 plays the role of opening the circuit, so that it will not get stuck inside the borehole.

[0055] In order to further improve the positioning effect of the anti-slip device, the cross-sectional shape of the housing 2 is a hexagon, and the radius of the hexagonal circumscribed circle is the same as the outer diameter of the large end of the conical head 201. The wheels 4 are arranged on three mutually spaced end faces, and a support plate 7 is provided on the end face of the housing 2 located between two adjacent wheels 4. The front end of the support plate 7 is hinged to the housing 2, and an elastic device is connected to the support plate 7, which causes the support plate 7 to rotate toward the outside of the housing 2.

[0056] The elastic device is a torsion spring, which is sleeved on the hinge shaft of the support plate 7, and the two ends of the torsion spring are fixedly connected to the support plate 7 and the housing 2 respectively.

[0057] Under the action of the torsion spring, the support plate 7 is opened to form an umbrella shape, so that the anchor cable body 1 moves backward and can be supported on the drill hole to play a positioning role.

[0058] For the convenience of carrying, a placement groove is concavely provided on the end face of the shell 2, and the support plate 7 is arranged inside the placement groove. At the same time, a locking plate 8 is provided at the end of the support plate 7 away from its hinge axis. The locking plate 8 is rotatably connected to the shell 2. After rotating to the top of the support plate 7, the support plate 7 can be pressed to prevent it from popping out and unfolding.

[0059] The rear end of the shell 2 is coaxially fixedly connected with a connecting sleeve 3, which is sleeved on the anchor cable body 1. The anchor cable body 1 and the connecting sleeve 3 are fixedly connected. The fixed connection method can be welding, glue injection, etc.

[0060] The anchor cable body 1 is provided with a glue spraying device, which can be arranged on the anchor cable body 1 in sections, or can be provided on the entire anchor cable body 1. In this case, the glue spraying device is equivalent to an anchor sleeve.

[0061] The glue spraying device is filled with anchoring glue, and a plurality of spray holes 902 are arranged on the circumferential surface of the glue spraying device. After the anchor cable body 1 is installed in place inside the drilled hole, the anchoring glue is sprayed out through the spray holes 902 .

[0062] The glue spraying device comprises a casing 9, which is sleeved on the anchor cable body 1. A glue cavity 901 is provided inside the casing 9, and the anchor glue is filled inside the glue cavity 901. A spray hole 902 is provided on the outer circumferential surface of the casing 9, and the anchor glue is sprayed out through the spray hole 902 by air pressure.

[0063] With this arrangement, the anchoring glue does not need to be poured into the borehole from the opening. The grouting equipment used for drilling hole grouting in the prior art is large in size. When grouting a vertical or inclined upward borehole, it is necessary to maintain pressure for a long time and seal the borehole opening to prevent the anchoring glue from flowing out. The present invention does not require large grouting equipment, but only requires an air compressor. The anchoring glue is sprayed out from the spray holes 902 at various positions, and the boreholes of any depth can be evenly filled with the anchoring glue, and the filling is more uniform.

[0064] The described glue cavity 901 is provided with an annular airbag 11 inside, the airbag 11 is located inside, the anchoring glue is filled between the airbag 11 and the outer wall of the casing 9, the outside of the airbag 11 is connected with an air pipe 12, and the air pipe 12 is arranged along the anchor cable body 1. The pressure inside the glue cavity 901 is increased by the expansion of the airbag, and then the anchoring glue is sprayed out from the spray hole 902. Because when the local pressure of the glue cavity 901 reaches the spray value of the anchoring glue, the spray hole 902 at this part opens, and the anchoring glue is sprayed out. If the airbag 11 is not provided, the opened spray hole 902 plays a role of pressure relief, and a large amount of high-pressure gas is discharged together through the spray hole 902. The pressure in other areas inside the glue cavity 901 cannot reach the opening value of the spray hole 902, and the anchoring glue cannot be sprayed out.

[0065] The above phenomenon can be avoided by setting the airbag 11. No matter which spray holes 902 are opened, it will not affect the pressure increase in other areas. When the airbag 11 expands to fill the entire glue cavity 901, the anchoring glue inside the glue cavity 901 is also completely sprayed out.

[0066] The spray hole 902 is provided with a sealing device 10 , which is opened by pressure-increasing control. After the sealing device 10 is opened, the anchoring glue is sprayed out from the spray hole 902 .

[0067] In this embodiment, the sealing device 10 is a sealing plate, which is pasted on the outside of the spray hole 902. When the pressure inside the glue chamber 901 increases, the anchoring glue squeezes the sealing plate to separate it from the spray hole 902, and the anchoring glue is sprayed out. In order to prevent the sealing plate from falling off during transportation or installation inside the drilled hole, a concave platform is concavely provided on the outside of the spray hole 902, and the sealing plate is clamped on the concave platform and adhered to the concave platform.

[0068] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. An impact-resistant tunnel support anchor cable, comprising an anchor cable body (1), characterized in that: The front end of the anchor cable body (1) is provided with an anti-slip device, the anti-slip device comprising a housing (2) and a rotating wheel (4), the housing (2) being coaxially fixedly connected to the anchor cable body (1). A plurality of grooves are concavely arranged on the end surface of the housing (2) and are distributed in a circular array around the axis thereof. The rotating wheel (4) is rotatably arranged inside the grooves, and a portion of the rotating wheel (4) leaks out of the housing (2). A rotating groove (202) which is in continuous communication with the groove is provided inside the housing (2), and a rotating shaft (401) of the rotating wheel (4) is rotatably disposed inside the rotating groove (202). A stop block (402) is convexly provided on the circumferential surface of the rotating shaft (401), and one side of the stop block (402) is an arc-shaped surface and the other side is a vertical surface. A spring cavity (203) is connected to the rotating groove (202) in the radial direction. A top block (5) and a spring (6) are provided inside the spring cavity (203). The spring (6) pushes the top block (5) to always abut against the circumferential surface of the rotating shaft (401). After the arc surface of the limit block (402) collides with the top block (5), the top block (5) can be pushed downward without affecting the rotation of the rotating shaft (401); After the vertical surface of the limit block (402) collides with the top block (5), the top block (5) blocks the limit block (402) to limit the rotation of the rotating shaft (401). The rotating wheel (4) rotates only when the anchor cable body (1) moves forward, and the rotating wheel (4) cannot rotate when the anchor cable body (1) moves backward. The cross-sectional shape of the shell (2) is hexagonal, the wheels (4) are arranged on three mutually spaced end faces, and a support plate (7) is provided on the end face of the shell (2) located between two adjacent wheels (4), and the front end of the support plate (7) is hinged to the shell (2). An elastic device is connected to the support plate (7), and the elastic device causes the support plate (7) to rotate toward the outside of the housing (2). The elastic device is a torsion spring, which is sleeved on the hinge shaft of the support plate (7), and the two ends of the torsion spring are respectively fixedly connected to the support plate (7) and the housing (2).

2. The impact-resistant tunnel support anchor cable according to claim 1, characterized in that: An arc-shaped abutting surface is provided between the arc-shaped surface and the vertical surface of the limit block (402); the outer diameter of the abutting surface is the same as the inner diameter of the rotating groove (202); and the abutting surface abuts against the inner wall of the rotating groove (202).

3. The impact-resistant tunnel support anchor cable according to claim 1, characterized in that: A conical head (201) is coaxially arranged at the front end of the housing (2).

4. The impact-resistant tunnel support anchor cable according to claim 1, characterized in that: The anchor cable body (1) is provided with a glue spraying device, the interior of which is filled with anchoring glue, and a plurality of spray holes (902) are provided on the circumferential surface of the glue spraying device. After the anchor cable body (1) is installed in place inside the drilled hole, the anchoring glue is sprayed out through the spray holes (902).

5. The impact-resistant tunnel support anchor cable according to claim 4, characterized in that: The glue spraying device comprises a casing (9), the casing (9) being sleeved on the anchor cable body (1), a glue cavity (901) being provided inside the casing (9), the glue cavity (901) being filled with anchor glue, and a spray hole (902) being provided on the outer circumferential surface of the casing (9), and the anchor glue is forced to be sprayed out through the spray hole (902) by air pressure.

6. The impact-resistant tunnel support anchor cable according to claim 5, characterized in that: The adhesive cavity (901) is provided with an annular airbag (11) inside, the airbag (11) is located inside, and the anchoring adhesive is filled between the airbag (11) and the outer wall of the casing (9). The outside of the air bag (11) is connected through an air pipe (12), and the air pipe (12) is arranged along the anchor cable body (1).

7. The impact-resistant tunnel support anchor cable according to claim 5 or 6, characterized in that: The spray hole (902) is provided with a sealing device (10), and the sealing device (10) is opened by pressure increase control. After the sealing device (10) is opened, the anchoring glue is sprayed out from the spray hole (902).

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