Mining self-adjusting grouting anchorage device
By designing a self-modulated grouting anchor for mining, using solid anchor cables and specific structures, the problems of bearing capacity reduction and slurry seepage caused by the hollow structure are solved, and the stability of surrounding rock support and construction efficiency are achieved.
Patent Information
- Application Number
- CN202420753507.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-04-10
AI Technical Summary
Among existing mining anchors, the hollow structure causes a decrease in bearing capacity, the slurry seepage speed is slow and easy to be blocked, and the different steel strands and the anchor shaft lead to slippery wire, which affects the support effect.
A self-modulated grouting anchor for mining is designed, using solid anchor cables and arc-shaped and cylindrical structures to realize slurry transport and coaxial locking of steel strands through grouting channels and clamping parts.
The shear force of anchoring is improved, the support stability of surrounding rock is enhanced, the slippery wire phenomenon is avoided, and the construction efficiency and support success rate are improved.
Smart Images
Figure CN222558574U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of mining anchors, in particular to a self-adjusting grouting anchor for mining. Background Art
[0002] During the mining process, as the coal seam deepens and the mine pressure increases, the large-section broken coal seam is bound to increase, and cracks will appear on the inner wall of the tunnel. The grouting anchor cable anchor used currently is to grout the surrounding rock through the hollow anchor cable grouting core tube, and then pre-tighten it with the anchor cable lock. During the grouting process, the slurry is infiltrated into the borehole with the help of the sieve hole of the anchor cable grouting core tube. The hollow structure causes the bearing capacity of the anchor cable to decrease. In addition, the slurry seeps out of the sieve hole at a low speed and easily blocks the sieve hole of the grouting core tube, affecting the efficiency of the grouting reinforcement project and the success rate of support. Moreover, due to the diverse and complex shapes of the support surface in the tunnel, the use of traditional anchor cable anchors for pre-tightening often results in the situation of being out of line with the steel strand. In the actual working process, the drilled anchor hole is often not perpendicular to the construction surface, causing the installed anchor cable to have a bending point at a certain point, and the problem of stress concentration will occur at the bending point, which is easy to cause the steel strand to slip, resulting in a reduction in effective bearing capacity and the inability to obtain reliable support for the construction surface. Utility Model Content
[0003] In order to make up for the above shortcomings, the utility model provides a self-adjusting grouting anchor for mining, which aims to improve the decrease in bearing capacity caused by hollow structural steel strands, the phenomenon that slurry seeps out of the sieve holes and easily blocks the sieve holes of the grouting core tube, and the problem of non-coaxiality between the steel strands and the anchor.
[0004] The utility model is implemented in this way: the utility model provides a self-adjusting grouting anchor for mining, comprising an anchor body, a grouting channel and a clamping piece.
[0005] The anchor specifically comprises an arc-shaped portion and a column-shaped portion for forming a grouting channel, and both the arc-shaped portion and the column-shaped portion are end-opening structures, wherein a grouting hole communicating with the grouting channel is opened on a side wall of the column-shaped portion.
[0006] The clamping member is composed of three wedge-shaped clamping rings of the same shape and size. The three wedge-shaped clamping rings can be assembled and placed in the grouting channel, and each of the wedge-shaped clamping rings is provided with a friction part.
[0007] In an embodiment of the present utility model, a first threaded portion is disposed on the inner wall of the arc-shaped portion.
[0008] In an embodiment of the present invention, the grouting holes can be opened vertically or obliquely on the side wall of the columnar portion.
[0009] In one embodiment of the utility model, the grouting holes are inclined at an angle of 1°-89°.
[0010] In an embodiment of the utility model, the grouting hole has a matching grouting bolt, and the grouting bolt can be detached and assembled to the grouting hole through a thread.
[0011] In an embodiment of the present utility model, the grouting hole is located between the wedge-shaped clamping ring and the arc-shaped portion.
[0012] The beneficial effects of the utility model are as follows: the utility model obtains a self-adjusting grouting anchor for mining through the above design. When in use, the solid anchor cable is fastened in the anchor body through the clamping piece, and the slurry can be transported through the grouting channel. Compared with the anchor cable anchor currently used on the market, by drilling a hole near the arc portion of the anchor cable anchor, the slurry is injected into the surrounding rock through the grouting channel of the anchor cable anchor by a grouting pump without destroying the structure of the anchor cable. The shear force of the full-length anchoring of the solid anchor cable is increased by more than 78.5% compared with the ordinary end anchoring method, and the anchor cable has a higher degree of firmness, which greatly improves the overall stability of the surrounding rock support.
[0013] At the same time, the arc part at one end of the anchor body can be used to facilitate the connection between the anchor and the pallet, which matches the tapered arc of the center hole of the pallet, so that the angle can be adjusted at will during installation. Through the action of the clamping part, the anchor is always in a coaxial state with the steel strand to avoid the phenomenon of thread slippage. By disassembling and installing any wedge clamp ring, the quick unlocking operation can be completed. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0015] Figure 1 It is a schematic diagram of the cross-sectional structure of a self-adjusting grouting anchor for mining provided by the embodiment of the utility model;
[0016] Figure 2 A schematic diagram of the three-dimensional structure of a self-adjusting grouting anchor for mining provided in an embodiment of the utility model;
[0017] Figure 3 A schematic diagram of the explosion structure of a self-adjusting grouting anchor for mining provided by the embodiment of the utility model;
[0018] Figure 4 A schematic diagram of the three-dimensional structure of the splicing of clamping parts in a self-adjusting grouting anchor for mining provided in an embodiment of the utility model.
[0019] In the figure: 100 - anchor body; 110 - arc-shaped portion; 111 - first threaded portion; 120 - columnar portion; 121 - grouting hole; 1211 - grouting bolt; 200 - grouting channel; 300 - clamping member; 310 - wedge-shaped clamping ring; 311 - friction portion. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.
[0022] Example
[0023] See also Figure 1 and Figure 2 The utility model provides a technical solution: a self-adjusting grouting anchor for mining, comprising an anchor body 100, a grouting channel 200 and a clamping member 300.
[0024] Among them, see Figure 1 and Figure 2 A grouting channel 200 is provided in the anchor body 100, and the clamping member 300 is placed in the grouting channel 200 along the opening of the columnar portion 120 to achieve coaxial locking and positioning of the steel strand and the anchor, while avoiding the occurrence of thread slippage.
[0025] See also Figure 1 and Figure 2 as well as Figure 3The anchor body 100 has an arcuate portion 110 and a columnar portion 120 forming a grouting channel 200, and both the arcuate portion 110 and the columnar portion 120 are end-opening structures, wherein a grouting hole 121 connected to the grouting channel 200 is opened on the side wall of the columnar portion 120, and the grouting hole 121 is located between the wedge clamp ring 310 and the arcuate portion 110 to prevent the wedge clamp ring 310 from blocking the flow of slurry. Specifically, the grouting hole 121 has a matching grouting bolt 1211, and the grouting bolt 1211 can be disassembled and assembled in the grouting hole 121 through a thread. Since the grout has not solidified when the cement slurry is just put in, it takes a certain amount of time to solidify, and the role of the grouting bolt 1211 is to block the grouting hole 121 before solidification, so as to prevent the cement slurry from flowing out. The inner wall of the arc-shaped portion 110 is provided with a first threaded portion 111, through which a grouting pipe can be connected, and the grouting pipe can be set to be made of steel or PVC material, so that the slurry can be directly injected into the borehole through the grouting pipe. The grouting hole 121 can be opened vertically or obliquely on the side wall of the columnar portion 120, and the angle of the grouting hole 121 is set at an angle of 1°-89°, which can adapt to different grouting directions and facilitate grouting operations according to actual conditions.
[0026] See also Figure 1-Figure 4 The clamping member 300 is composed of three wedge-shaped clamp rings 310 of the same shape and size. The three wedge-shaped clamp rings 310 can be assembled and placed in the grouting channel 200, and each wedge-shaped clamp ring 310 is provided with a friction portion 311. The friction portion 311 is set as a threaded structure, which can play a role in clamping and anti-slip, and better lock the steel strand. Due to its own structure, the three wedge-shaped clamp rings 310 can provide a certain clamping force, friction force and clamping angle to the steel strand in the grouting channel 200 after being assembled into the grouting channel 200. The clamping angle can be autonomously self-locking and controlled according to the shape and size of the steel strand, and avoid unnecessary damage to the steel strand. Most importantly, it can be quickly positioned.
[0027] Specifically, the working principle of the self-adjusting grouting anchor for mining is as follows: the arc portion 110 at one end of the anchor body 100 is connected to the pallet, and its arc surface can just match the conical curvature of the center hole of the pallet, so that the anchor body 100 can be rotated on the pallet at will and automatically adjust its position, so that the steel strand is passed through the pallet, and then passed through the grouting channel 200 of the anchor body 100 in turn, and then the three wedge-shaped clamp rings 310 are spliced to form a clamping member 300 and inserted into the opening of the columnar portion 120, so that the wedge-shaped clamp ring 310 can self-lock the steel strand in the grouting channel 200, further improving the safety of the work, and then grouting is carried out into the grouting hole 121, and the grouting slurry is poured into the grouting hole 121 and flows into the borehole from the grouting channel 200 to diffuse.
[0028] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A self-adjusting grouting anchor for mining, characterized in that: include An anchor body (100), the anchor body (100) comprising an arcuate portion (110) and a columnar portion (120) for forming a grouting channel (200), wherein the arcuate portion (110) and the columnar portion (120) are both end-opening structures, wherein a grouting hole (121) communicating with the grouting channel (200) is provided on a side wall of the columnar portion (120); The clamping member (300) is composed of three wedge-shaped clamping rings (310) of the same shape and size. The three wedge-shaped clamping rings (310) can be assembled and placed in the grouting channel (200), and each of the wedge-shaped clamping rings (310) is provided with a friction portion (311).
2. A self-adjusting grouting anchor for mining according to claim 1, characterized in that: The inner wall of the arc-shaped portion (110) is provided with a first threaded portion (111).
3. A self-adjusting grouting anchor for mining according to claim 1, characterized in that: The grouting hole (121) may be opened vertically or obliquely on the side wall of the columnar portion (120).
4. A self-adjusting grouting anchor for mining according to claim 3, characterized in that: The grouting holes (121) are inclined at an angle of 1°-89°.
5. A self-adjusting grouting anchor for mining according to claim 4, characterized in that: The grouting hole (121) has a matching grouting bolt (1211), and the grouting bolt (1211) can be detached from the grouting hole (121) via a thread.
6. A self-adjusting grouting anchor for mining according to claim 5, characterized in that: The grouting hole (121) is located between the wedge-shaped clamping ring (310) and the arc-shaped portion (110).