A two-way self-locking through anchor device suitable for unilateral construction

Abstract

The utility model belongs to the coal mining technical field, concretely relates to a kind of two-way self-locking type across anchor cable device suitable for unilateral construction, including anchor cable body, the one end of anchor cable body is equipped with limit block, the outside of anchor cable body is equipped with grouting bag, grouting bag is connected with grouting pipe;The other end of anchor cable body is equipped with anchoring mechanism, anchoring mechanism is located in the construction area in coal mine, and there is supporting plate between anchoring mechanism and coal pillar;Anchoring mechanism includes lock body, clamping piece and push, the inside of lock body is embedded with conical part, conical part is sleeved on the outside of anchor cable body, and the large-diameter end of conical part is connected with the end of lock body;Multiple clamping piece circumferential array is arranged in the inside of lock body, and the one end of each clamping piece is in abutment with the outer wall of anchor cable body;Push is sleeved on anchor cable body, and push is located in the side of clamping piece, and anchor cable body is positioned by anchoring mechanism;The utility model can realize the two-way stable extrusion to coal pillar.

Description

Technical Field

[0001] This utility model belongs to the field of coal mining technology, specifically relating to a bidirectional self-locking through-anchor cable device suitable for unilateral construction. Background Technology

[0002] Currently, in narrow coal pillar reinforcement projects in coal mines, the bag grouting process is commonly used for situations where only one side is suitable for construction. This involves injecting cement grout into a bag on the goaf side through a grouting pipe inserted along with the anchor cable. The chemical bonding force of the cement after solidification then binds the anchor cable to the bag to form an anchor point. However, the reliability of this process is highly dependent on the bond strength between the cement and the anchor cable, and is greatly affected by the grout fullness, cement ratio, and curing conditions, making it prone to quality problems such as weak bonding or anchor cable slippage. Secondly, this process requires waiting for the cement to fully solidify before tensioning, which prevents parallel construction and results in low overall efficiency. Finally, traditional structures often result in tension at the inner end and compression at the outer end of the coal pillar, leading to an unreasonable stress structure. Furthermore, under mining stress and shear force, anchor cables relying solely on chemical bonding are prone to failure, making it difficult to meet the long-term stability reinforcement requirements of narrow coal pillars under high stress environments. Utility Model Content

[0003] The purpose of this invention is to provide a bidirectional self-locking through-anchor cable device suitable for unilateral construction, which can achieve bidirectional stable compression of the coal pillar under unilateral construction conditions, thereby improving the bearing capacity of the coal pillar and construction efficiency.

[0004] The technical solution of this utility model is as follows: a bidirectional self-locking through-and-through anchor cable device suitable for unilateral construction, installed on a coal pillar in underground coal mines, dividing the underground space of the coal mine into a goaf area and a construction area through the coal pillar. The bidirectional self-locking through-and-through anchor cable device includes an anchor cable body, which is installed in a borehole on the coal pillar. One end of the anchor cable body is provided with a limiting block located in the goaf area of ​​the underground coal mine. A grouting bag is fitted over the outside of the anchor cable body, located between the limiting block and the coal pillar. A grouting pipe is connected to the grouting bag and installed in a borehole on the coal pillar. The other end of the anchor cable body is provided with an anchoring mechanism located in the construction area of ​​the underground coal mine. A support plate is provided between the anchoring mechanism and the coal pillar.

[0005] The anchoring mechanism includes a lock body, clamps, and a pusher. A conical component is embedded inside the lock body and is fitted onto the outside of the anchor cable body, with the larger diameter end of the conical component connected to the end of the lock body. Multiple clamps are arranged in a circumferential array inside the lock body, with one end of each clamp abutting against the outer wall of the anchor cable body. The pusher is fitted onto the anchor cable body and is located on one side of the clamps. The mechanical self-locking structure formed by the lock body, clamps, and pusher together limits the anchor cable body.

[0006] Preferably, the grouting bag is a foldable structure, and the grouting bag is ring-shaped when unfolded. The ring-shaped grouting bag is slidably connected to the anchor cable body through its inner ring; the grouting pipe is connected to the inside of the grouting bag.

[0007] Preferably, the lock body is in the shape of a hollow frustum, with the small-diameter end of the lock body connected to the large-diameter end of the conical component, and the length of the conical component being 1 / 2 of the length of the lock body.

[0008] Preferably, the clip has a triangular structure, and the adjacent two sides of the clip match the side wall of the tapered piece and the inner wall of the lock body, respectively.

[0009] Preferably, the pusher includes an abutting circular plate, the diameter of which matches the inner diameter of the middle part of the lock body, and a locking nut is provided on one side of the abutting circular plate, which is threadedly connected to the anchor cable body.

[0010] The beneficial effects of this utility model are as follows: By setting up foldable grouting bags in the goaf, and filling the grouting bags with cement to form a physical locking position, it replaces the traditional anchoring method that relies solely on chemical bonding, fundamentally solving the problem of anchor cable slippage caused by insufficient bonding force after cement solidification. At the same time, in the construction area, the mechanical self-locking structure formed by the cooperation of the locking body and the clamping plate in the anchoring mechanism, by turning the locking nut to push the clamping plate to retract radially, achieves mechanical engagement and locking of the anchor cable body. This dual guarantee mechanism of physical locking and mechanical self-locking makes the anchoring force of the coal pillar not limited by the grouting solidification time, and can quickly establish pre-tightening force without waiting for curing, greatly improving construction efficiency. In addition, this utility model puts both sides of the coal pillar under pressure, improving the coal pillar bearing capacity and construction efficiency. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the working state of this utility model;

[0013] Figure 2 This is a schematic diagram of the anchoring mechanism in this utility model.

[0014] In the figure: anchor cable body 1, limiting block 11; grouting bag 2, grouting pipe 21; anchoring mechanism 3, lock body 31, clamping plate 32, jacking 33, abutting circular plate 331, locking nut 332, conical part 34; support plate 4; coal pillar 5, goaf 51, construction area 52, borehole 53. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] like Figure 1 and Figure 2 As shown, a bidirectional self-locking through-and-through anchor cable device suitable for unilateral construction is installed on a coal pillar 5 in an underground coal mine. The coal pillar 5 divides the underground space of the coal mine into a goaf area 51 and a construction area 52. The bidirectional self-locking through-and-through anchor cable device includes an anchor cable body 1, which is installed in a borehole 53 on the coal pillar 5. One end of the anchor cable body 1 is provided with a limiting block 11, which is located in the goaf area 51 in the underground coal mine. A grouting bag 2 is fitted on the outside of the anchor cable body 1, which is located between the limiting block 11 and the coal pillar 5. A grouting pipe 21 is connected to the grouting bag 2, which is installed in the borehole 53 on the coal pillar 5. The other end of the anchor cable body 1 is provided with an anchoring mechanism 3, which is located in the construction area 52 in the underground coal mine. A support plate 4 is provided between the anchoring mechanism 3 and the coal pillar 5.

[0018] The grouting bag 2 is a foldable structure. When unfolded, the grouting bag 2 is annular, and the annular grouting bag 2 is connected to the anchor cable body 1 through its inner ring in a sliding fit. The grouting pipe 21 is connected to the inside of the grouting bag 2.

[0019] Based on the above implementation, workers cannot enter the goaf area 51 underground in the coal mine and can only work in the construction area 52. The grouting bag 2 is initially in a folded state. The anchor cable body 1 and the grouting bag 2 are placed into the drill hole 53 opened on the coal pillar 5, and the grouting bag 2 is sent into the goaf area 51 underground in the coal mine through the anchor cable body 1 and the grouting pipe 21. Cement is injected into the grouting bag 2 through the grouting pipe 21, so that the grouting bag 2 gradually unfolds until the grouting bag 2 is fully unfolded. The grouting is circular, and grouting inside the grouting bag 2 can be stopped at this time, and the grouting bag 2 is in the unfolded state. After the grouting inside the grouting bag 2 is completed, the grouting pipe 21 does not participate in the force and does not hinder the sliding of the anchor cable body 1. When the grouting bag 2 is in the unfolded state, the anchor cable body 1 is pulled, so that the limiting block 11 presses the grouting bag 2 against the side wall of the coal pillar 5. At this time, the support plate 4 is pressed against the other side wall of the coal pillar 5 through the anchoring mechanism 3, realizing the mechanical structure that the coal pillar 5 is under pressure on both sides.

[0020] In this embodiment, the anchoring mechanism 3 includes a lock body 31, a clamping piece 32, and a pusher 33. A conical piece 34 is embedded inside the lock body 31 and is fitted onto the outside of the anchor cable body 1. The large-diameter end of the conical piece 34 is connected to the end of the lock body 31. Multiple clamping pieces 32 are arranged in a circumferential array inside the lock body 31, and one end of each clamping piece 32 abuts against the outer wall of the anchor cable body 1. The pusher 33 is fitted onto the anchor cable body 1 and is located on one side of the clamping piece 32. The mechanical self-locking structure formed by the lock body 31, the clamping piece 32, and the pusher 33 together limits the anchor cable body 1.

[0021] Based on the above embodiments, when the grouting bag 2 is pressed against the side wall of the coal pillar 5, in order to prevent the anchor cable body 1 from slipping and causing the grouting bag 2 to separate from the side wall of the coal pillar 5, the locking body 31 is sleeved on the anchor cable body 1, and the support plate 4 is pressed against the other side wall of the coal pillar through the locking body 31; several clamping pieces 32 are placed inside the locking body 31, and one end of the multiple clamping pieces 32 moves along the conical piece 34, so that one end of the multiple clamping pieces 32 moves away from each other and the other end moves closer to each other, until the ends of the multiple clamping pieces 32 abut against the outer wall of the anchor cable body 1, at which point the clamping pieces 32 can no longer be moved; the pusher 33 is pushed, and the pusher 33 presses the multiple clamping pieces 32 into the inside of the locking body 31, ensuring that the clamping pieces 32 cannot move, so that the multiple clamping pieces 32 work together to limit the anchor cable body 1, so that the anchor cable body 1 has a certain tension.

[0022] The lock body 31 is a hollow frustum shape. The small diameter end of the lock body 31 is connected to the large diameter end of the conical part 34. The length of the conical part 34 is 1 / 2 of the length of the lock body 31.

[0023] Specifically, the clip 32 has a triangular structure, and the adjacent two sides of the clip 32 match the side wall of the conical piece 34 and the inner wall of the lock body 31, respectively. It should be noted that when the lock body 31 is not fitted onto the anchor cable body 1, multiple clips 32 are placed inside the lock body 31, and one end of multiple clips 32 is pushed to the small-diameter end of the lock body 31. At this time, one end of multiple clips 32 moves away from each other, while the other end abuts against each other.

[0024] In addition, the pusher 33 includes an abutting circular plate 331, the diameter of which is the same as the inner diameter of the middle part of the hollow frustum-shaped lock body 31, so that the abutting circular plate 331 can be moved to the middle position inside the lock body 31. A locking nut 332 is provided on one side of the abutting circular plate 331, and the locking nut 332 is threadedly connected to the anchor cable body 1. It should be noted that when the clamping piece 32 is not placed inside the lock body 31, the abutting circular plate 331 can be placed inside the lock body 31 so that the abutting circular plate 331 abuts against the small diameter end of the conical piece 34.

[0025] Based on the above embodiments, the small-diameter end of the lock body 31 abuts against the support plate 4. Multiple clamping pieces 32 are placed into the large-diameter end of the lock body 31, and the locking nut 332 is turned to push the abutting round plate 331 along the anchor cable body 1. The abutting round plate 331 gradually pushes the multiple clamping pieces 32 to the small-diameter end of the lock body 31. The multiple clamping pieces 32 move along the side wall of the conical member 34 until one end of the multiple clamping pieces 32 abuts against the anchor cable body 1. At this time, the multiple clamping pieces 32 work together to clamp the anchor cable body 1. The multiple clamping pieces 32 can only transmit thrust to the abutting round plate 331. The locking nut 332 prevents the abutting round plate 331 and the clamping pieces 32 from moving, thereby achieving the locking of the anchor cable body 1.

[0026] The working principle of this utility model is as follows: Workers operate in the construction area 52 underground in a coal mine, placing the anchor cable body 1, grouting bag 2, and grouting pipe 21 into the drill hole 53 on the coal pillar 5. The limiting block 11 at one end of the anchor cable body 1 and the grouting bag 2 extend into the goaf 51. Cement is injected into the grouting bag 2 through the grouting pipe 21, causing the grouting bag to change from a folded state to an unfolded state, and the injection of cement into the grouting bag 2 is stopped. The anchor cable body 1 is pulled, causing the limiting block 11 to press the grouting bag 2 against the side wall of the coal pillar 5. The support plate 4 is pressed against the other side wall of the coal pillar through the locking body 31. Multiple clamping pieces 32 are placed inside the locking body 31, and the locking nut 332 is tightened. The locking nut 332 pushes the abutting circular plate 331 to move along the anchor cable body 1. The abutting circular plate 331 gradually pushes the multiple clamping pieces 32 to the small diameter end of the locking body 31. Under the action of the conical piece 34, one end of the multiple clamping pieces 32 approaches each other, and the multiple clamping pieces 32 work together to clamp the anchor cable body 1. The locking nut 332 prevents the multiple clamping pieces 32 from moving, so that the anchor cable body 1 has a certain tension. At this time, the grouting bag 2 filled with cement and the support plate 4 are respectively pressed against the two sides of the coal pillar 5, forming a stress structure with pressure on both sides of the coal pillar 5. This stress structure is more stable than the traditional single-sided tension structure; it significantly improves the overall bearing capacity and deformation resistance of the coal pillar 5.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bidirectional self-locking through-hole anchor cable device suitable for unilateral construction, installed on a coal pillar in an underground coal mine, dividing the underground space into a goaf area and a construction area through the coal pillar, wherein the bidirectional self-locking through-hole anchor cable device includes an anchor cable body, the anchor cable body being installed in a borehole on the coal pillar, characterized in that, One end of the anchor cable body is provided with a limiting block, which is located in the goaf area of ​​the coal mine. A grouting bag is sleeved on the outside of the anchor cable body, which is located between the limiting block and the coal pillar. A grouting pipe is connected to the grouting bag and is located in a borehole in the coal pillar. The other end of the anchor cable body is provided with an anchoring mechanism, which is located in the construction area of ​​the coal mine. A support plate is provided between the anchoring mechanism and the coal pillar. The anchoring mechanism includes a lock body, a clamping plate, and a pusher. A conical component is embedded inside the lock body and is fitted onto the outside of the anchor cable body, with the larger diameter end of the conical component connected to the end of the lock body. The clamping plate has a triangular structure, with its adjacent two sides matching the side wall of the conical component and the inner wall of the lock body, respectively. Multiple clamping plates are arranged in a circumferential array inside the lock body, with one end of each clamping plate abutting against the outer wall of the anchor cable body. The pusher is fitted onto the anchor cable body and is located on one side of the clamping plate. The mechanical self-locking structure formed by the lock body, clamping plate, and pusher together limits the anchor cable body.

2. The bidirectional self-locking through-anchor cable device suitable for unilateral construction according to claim 1, characterized in that, The grouting bag is a foldable structure. When unfolded, the grouting bag is ring-shaped, and the ring-shaped grouting bag is slidably connected to the anchor cable body through its inner ring; the grouting pipe is connected to the inside of the grouting bag.

3. A bidirectional self-locking through-anchor cable device suitable for unilateral construction according to claim 2, characterized in that, The lock body is in the shape of a hollow frustum, with the small-diameter end of the lock body connected to the large-diameter end of the conical component. The length of the conical component is 1 / 2 of the length of the lock body.

4. A bidirectional self-locking through-anchor cable device suitable for unilateral construction according to claim 3, characterized in that, The pusher includes an abutting circular plate, the diameter of which matches the inner diameter of the middle part of the lock body. A locking nut is provided on one side of the abutting circular plate, and the locking nut is threadedly connected to the anchor cable body.

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