A method for cutting support anchor cable using water cutting technology

Abstract

The present invention discloses a method for cutting supporting anchor cables by using water cutting technology, comprising S1: first drilling a hole by using a drilling machine, and then pushing the supporting anchor cable into the hole and fixing it with a quick-setting agent; S2: a circular anchor steel liner and an anchor cable support plate sequentially pass through the upper part of the supporting anchor cable and adhere to the tunnel roof, and anchor the supporting anchor cable through an anchor head; S3: after the working face is mined, when the supporting anchor cable enters the goaf and the distance from the suspended top to the working face is greater than 1m; S4: aligning the fixed pin shaft of the water cutting mechanism with the fixed channel of the circular anchor steel liner for assembly and connection; S5: the water cutting head is installed in the clamping structure of the fixing frame; S6: starting the high-pressure water pump, and the water cutting head cuts the supporting anchor cable by high-pressure water flow until the supporting anchor cable is completely cut off; the method is simple to implement and risk-free, and the supporting anchor cable can be safely and conveniently cut off by using water cutting technology, so that it loses its suspension effect, and the natural collapse of the suspended top is realized, thereby achieving the purpose of controlling the suspended top at the end of the working face.

Description

Technical Field

[0001] The invention relates to the technical field of anchor cable cutting in coal mining tunnels, and in particular to a method for cutting off supporting anchor cables using a water cutting technique. Background Art

[0002] When mining coal using the long-arm backward mining method, most of the recovery tunnels use anchor-net-cable combined support, that is, the metal mesh is fixed or tied to the anchor rod with a support plate, and the long anchor cable penetrates into the roof to play a reinforcing and supporting role. During the mining process, the top coal at the end of the working face is not easy to collapse, leaving a large area of ​​blind tunnels with suspended roofs in the goaf. Once collapsed, it seriously endangers the life safety of the end support workers. The failure of the top coal at the end to collapse in time also causes a decrease in the coal recovery rate. In addition, since fresh air flow can easily flow to the goaf through the suspended roof space at the end, major disasters such as spontaneous combustion of coal in the goaf can occur. An important reason for the suspended roof of this type of goaf is the suspension of the anchor cable supporting the recovery tunnel, but during the mining process, it must rely on the suspension reinforcement function of the anchor cable and cannot be abandoned.

[0003] When dealing with blind alleys with suspended roofs in such goafs, blasting or hydraulic fracturing is generally used to weaken the strength of the suspended roof coal body and make it collapse naturally. However, these two methods are difficult to construct, relatively complex, and expensive, and there are certain safety risks. Even after weakening, some suspended roofs will not collapse completely due to the suspension effect of the anchor cables, leaving space gaps, and the hazards of suspended roofs cannot be completely cured. Summary of the invention

[0004] In response to the above-mentioned problem of hanging roof at the end of the working face mining tunnel during coal mining, the present application provides a method of cutting the supporting anchor cable by using water cutting technology, which cuts the anchor cable from the anchoring end so that it loses its suspension effect, realizes the natural collapse of the hanging roof, and thus achieves the purpose of controlling the hanging roof at the end of the working face.

[0005] To achieve the above purpose, the present application proposes a method for cutting a support anchor cable using a water cutting technique, comprising:

[0006] S1: First use a drill to drill a hole, then push the support anchor cable into the hole and fix it with a quick-setting agent;

[0007] S2: The circular anchor steel liner and the anchor cable support plate pass through the upper part of the supporting anchor cable in sequence and are close to the top plate of the tunnel, and the supporting anchor cable is anchored through the anchor head;

[0008] S3: After the working face is mined, when the support anchor cable enters the goaf and the distance from the top to the working face is greater than 1m, preparations are made to cut off the support anchor cable;

[0009] S4: Align the fixing pin of the water jet cutting mechanism with the fixing channel of the circular anchor steel liner for assembly and connection;

[0010] S5: The water cutting head is installed in the clamping structure of the fixed frame;

[0011] S6: Turn on the high-pressure water pump, and the water cutting cutter head cuts the support anchor cable through the high-pressure water flow until the support anchor cable is completely cut off;

[0012] S7: After the supporting anchor cable is cut off, it loses its suspension function, and the circular anchor steel liner and fixing frame fall off naturally.

[0013] Furthermore, the above method also includes:

[0014] S8: Recover the circular anchor steel liner and fixing frame so that they can be reused when installing the supporting anchor cable.

[0015] Furthermore, the circular anchor steel liner is made of a steel plate with a thickness δ of 30 mm to 50 mm according to actual application requirements, has a radius of R, and has a through hole in the middle with the same diameter 2r as the supporting anchor cable.

[0016] Furthermore, the through hole is provided with cross-circular through holes on both sides in the longitudinal direction and the transverse direction, and the diameter of the through holes is less than δ / 2 and is determined by the diameter of the water cutting cutter head.

[0017] Furthermore, the cross-circular through hole includes cutting channels symmetrically arranged on both sides of the through hole in the longitudinal direction and fixing channels symmetrically arranged on both sides of the through hole in the transverse direction.

[0018] Furthermore, the water cutting mechanism includes a fixing frame, a fixing pin and a water cutting head. The fixing frame is made of flat steel bent into a circular ring shape with a radius of R′=R+1mm. One longitudinal end thereof is provided with a clamping structure for fixing the water cutting head, and a fixing pin is symmetrically welded on the transverse inner wall.

[0019] Compared with the prior art, the above technical scheme adopted by the present invention has the advantages that: the method is simple to implement and risk-free, and the water cutting technology can be used to safely and conveniently cut off the supporting anchor cable, causing it to lose its suspension effect, thereby achieving the natural collapse of the suspended top, thereby achieving the purpose of controlling the suspended top at the end of the working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the installation of a circular anchor steel liner;

[0021] Figure 2 It is a schematic diagram of the circular anchor steel liner structure;

[0022] Figure 3 It is a schematic diagram of the water jet cutting mechanism structure;

[0023] Explanation of the serial numbers in the figure: 1. Support anchor cable, 2. Round anchor steel liner, 3. Anchor cable support plate, 4. Anchor head, 5. Support top plate surface, 6. Through hole, 7. Cross round through hole, 8. Fixed frame, 9. Fixed pin, 10. Water cutting knife head, 11. Clip structure, 12. High pressure pipe. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, that is, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0026] It should be noted that the term "comprise" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example 1

[0029] like Figure 1-3As shown, this embodiment provides a cutting device for implementing the above method, which includes a circular anchor steel pad and a water cutting mechanism, one side of the circular anchor steel pad is tightly attached to the support top plate surface, and the other side is tightly attached to the anchor cable support plate, the circular anchor steel pad and the anchor cable support plate are both provided with through holes for the support anchor cables to pass through, and the circular anchor steel pad is also provided with a cross circular through hole, the cross circular through hole includes cutting channels symmetrically arranged on both sides of the through hole in the longitudinal direction and fixing channels symmetrically arranged on both sides of the through hole in the transverse direction, and the fixed channel is connected to the water cutting mechanism.

[0030] The water cutting mechanism includes a fixing frame, a fixing pin and a water cutting cutter head. The fixing pin is symmetrically welded on the transverse inner wall of the fixing frame. A clamping structure is provided at one longitudinal end of the fixing frame. The water cutting cutter head is installed in the clamping structure. A high-pressure pipe is connected to the tail of the water cutting cutter head.

[0031] During assembly, the fixing pin of the water cutting mechanism is located in the fixing channel of the circular anchor steel liner.

[0032] The anchor head is located on the supporting anchor cable, and the anchor cable support plate and the circular anchor steel liner are fastened to the supporting top plate surface in sequence.

[0033] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A method for cutting a support anchor cable using water cutting technology, characterized in that: The cutting device is used for implementation, and the cutting device includes: a circular anchor steel pad and a water cutting mechanism, one side of the circular anchor steel pad is tightly attached to the support top plate surface, and the other side is tightly attached to the anchor cable support plate, the circular anchor steel pad and the anchor cable support plate are both provided with through holes for the support anchor cable to pass through, and a cross circular through hole is also provided on the circular anchor steel pad, the cross circular through hole includes cutting channels symmetrically arranged on both sides of the through hole in the longitudinal direction and fixing channels symmetrically arranged on both sides of the through hole in the transverse direction, and the fixed channel is connected with a water cutting mechanism; the water cutting mechanism includes a fixing frame, a fixing pin and a water cutting blade, the fixing frame is made of flat steel bent into a circular ring shape, the radius is R′=R+1mm, one end portion of the fixing frame in the longitudinal direction is provided with a clamping structure for fixing the water cutting blade, and the transverse inner wall is symmetrically welded with a fixing pin; the method includes: S1: First use a drill to drill a hole, then push the support anchor cable into the hole and fix it with a quick-setting agent; S2: The circular anchor steel liner and the anchor cable support plate pass through the upper part of the supporting anchor cable in sequence and are close to the top plate of the tunnel, and the supporting anchor cable is anchored through the anchor head; S3: After the working face is mined, when the support anchor cable enters the goaf and the distance from the top to the working face is greater than 1m, preparations are made to cut off the support anchor cable; S4: Align the fixing pin of the water jet cutting mechanism with the fixing channel of the circular anchor steel liner for assembly and connection; S5: The water cutting head is installed in the clamping structure of the fixed frame; S6: Turn on the high-pressure water pump, and the water cutting cutter head cuts the support anchor cable through the high-pressure water flow until the support anchor cable is completely cut off; S7: After the support anchor cable is cut off, the suspension function is lost, and the circular anchor steel liner and the fixing frame fall off naturally; S8: Recover the circular anchor steel liner and fixing frame so that they can be reused when installing the supporting anchor cable; The circular anchor steel liner is made of a steel plate with a thickness δ of 30 mm to 50 mm, a radius of R, and a through hole with the same diameter 2r as the supporting anchor cable in the middle.

2. A method for cutting supporting anchor cables using water cutting technology according to claim 1, characterized in that: The through hole is provided with cross-circular through holes on both sides of the longitudinal direction and the transverse direction. The diameter of the through holes is less than δ / 2 and is determined by the diameter of the water cutting cutter head.

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