A large deformation controlled anchor cable for deep coal mine tunnels

Abstract

This invention belongs to the field of soft rock roadway support in underground engineering, specifically relating to a large deformation control anchor cable for deep coal mine roadways. The anchor cable includes a first sleeve and a second sleeve of the same diameter; the first sleeve is closed at one end and open at the other, and connects to one end of the second sleeve, which is open at both ends. This invention can reduce the tensile force on the anchor cable through the deformation of a rigid spring, providing a certain degree of resistance. Furthermore, after the rigid spring fails, the added secondary support resistance head provides resistance to the enlarged end of the rod, thereby controlling the large deformation of the surrounding rock.

Description

Technical Field

[0001] The invention belongs to the field of soft rock tunnel support in underground engineering, and in particular relates to a large deformation controlled anchor cable used in deep tunnels of coal mines. Background Art

[0002] As shallow coal resources are depleted, coal mining gradually turns to deep areas. After entering deep areas, the support requirements for soft rock tunnels have the characteristics of large allowable deformation and large deformation resistance, which brings great convenience to coal mining and safety. However, when rock burst occurs, the pressure-yielding performance and ultimate tensile strength of traditional large deformation anchor cables and anchor rods cannot withstand the surrounding rock pressure that increases several times in an instant, thus losing the support effect. Therefore, how to better control the deformation of anchor rods and anchor cables caused by rock burst is an important direction for improving anchor support technology. Summary of the invention

[0003] In order to solve the problem of serious damage to the supporting structure after rock burst occurs, the present invention provides a large deformation controlled anchor cable for deep tunnels in coal mines.

[0004] The object of the present invention is achieved by the following means: a large deformation controlled anchor cable for deep tunnels in coal mines, the anchor cable comprising a No. 1 sleeve and a No. 2 sleeve with the same diameter; one end of the No. 1 sleeve is closed and the other end is open, and is butted with one end of the No. 2 sleeve with both ends open;

[0005] A rod body head is provided with an enlarged end, the enlarged end and part of the rod body are inserted into the first sleeve and the second sleeve, and the corresponding side walls of the enlarged end, the first sleeve and the second sleeve are respectively provided with a plurality of plug holes, and the enlarged end, the first sleeve and the second sleeve are fixed by inserting the plug pin into the plug hole;

[0006] A tray is installed on the tail end of the rod body extending out of the No. 2 sleeve, and the tray is fixed to the tail end of the No. 2 sleeve by a nut;

[0007] A rigid spring is installed between the top of the enlarged end and the inner wall of the closed end of the No. 1 sleeve.

[0008] As a further optimization of this solution, hook rings are respectively installed on the top of the enlarged end and the inner wall of the closed end of the No. 1 sleeve, and the rigid spring connects the enlarged end and the No. 1 sleeve through the hook ring.

[0009] As a further optimization of this solution, the inner wall of the No. 2 sleeve is provided with a plurality of resistance heads.

[0010] As a further optimization of this solution, a reciprocating dynamic seal is achieved between the enlarged end and the No. 1 sleeve and the No. 2 sleeve.

[0011] The invention discloses a large deformation control anchor cable for deep tunnels in coal mines. When impact ground pressure occurs in deep rock mass, the tunnel surrounding rock pressure instantly increases several times, and at the same time, the surrounding rock undergoes a large deformation toward the tunnel center. The anchor cable can reduce the suddenly increased surrounding rock pressure through the elastic deformation of the rigid spring inside the end head. After the rigid spring and the plug are damaged and fail, the two additional support resistance heads distributed in a cross-staggered manner in the No. 2 sleeve will apply resistance to the enlarged end head after the rod body moves with the surrounding rock, thereby giving full play to the tensile strength of the anchor cable and controlling the large deformation of the surrounding rock. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0013] Figure 1 It is a schematic diagram of the structure of the present invention;

[0014] Figure 2 It is a schematic diagram of the enlarged end structure in the present invention;

[0015] Figure 3 for Figure 1 AA section view;

[0016] In the figure, sleeve No. 1 1, rigid spring 2, plug pin 3, enlarged end 4, resistance head 5, sleeve No. 2 6, nut 7, rod body 8, tray 9. DETAILED DESCRIPTION

[0017] like Figure 1 , Figure 2 , Figure 3 As shown, the invention discloses a large deformation controlled anchor cable for deep tunnels in coal mines, the anchor cable comprises a No. 1 sleeve 1 and a No. 2 sleeve 6 with the same diameter; the No. 1 sleeve 1 is closed at one end and open at the other end, and is butted with one end of the No. 2 sleeve 6 with both ends open;

[0018] A rod body 8 is provided with an enlarged end 4 at its head, and the enlarged end 4 and part of the rod body 8 are inserted into the No. 1 sleeve 1 and the No. 2 sleeve 6, so that a reciprocating dynamic seal is realized between the enlarged end and the No. 1 sleeve and the No. 2 sleeve. The enlarged end 4, the No. 1 sleeve 1 and the No. 2 sleeve 6 are provided with a plurality of insertion holes 11 at the corresponding positions of the side walls thereof, and the enlarged end 4, the No. 1 sleeve 1 and the No. 2 sleeve 6 are fixed by inserting the insertion pin 3 into the insertion hole 11;

[0019] A tray 9 is installed on the tail end of the rod body 8 extending out of the second sleeve 6, and the tray 9 is fixed to the tail end of the second sleeve 6 by a nut 7;

[0020] A rigid spring 2 is installed between the top of the enlarged end 4 and the inner wall of the closed end of the No. 1 sleeve 1.

[0021] A hook ring 10 is installed on the top of the enlarged end 4 and the inner wall of the closed end of the No. 1 sleeve 1 respectively, and the rigid spring 2 is connected to the enlarged end 4 and the No. 1 sleeve 1 through the hook ring 10.

[0022] The inner wall of the No. 2 sleeve 6 is provided with a plurality of resistance heads 5 .

[0023] During installation, first insert the rod body 8 into the No. 2 sleeve 6, align the rod body 8 and the socket 11 of the No. 2 sleeve 6, plug in the plug pin 3 to fix the rod body 8, then install one end of the rigid spring 2 on the hook ring 10 of the enlarged end 4, and the other end on the hook ring 10 of the No. 1 sleeve 1, insert the plug pin 3 at the position where the socket 10 of the No. 1 sleeve 1 is aligned with the socket 10 of the enlarged end 4, fix the No. 1 sleeve 1, and finally pass the tray 9 through the rod body 8 and install it on the tail end of the No. 2 sleeve 6, and tighten the screw 7 to fix the tray 9.

[0024] When in use, the anchoring agent is first pushed into the rock mass through the anchor cable to anchor the end of the anchor cable to the surrounding rock. When impact ground pressure occurs in the deep rock mass, the surrounding rock pressure increases suddenly, the rock mass deforms greatly and the anchor cable is subjected to tension. The rigid spring in the drag sleeve undergoes elastic deformation to reduce the impact ground pressure to a certain extent, thereby preventing the anchor cable from being pulled apart and failing. After the rigid spring fails, the enlarged end is acted upon by the resistance head, which controls the deformation of the surrounding rock. When the first row of resistance heads fails, the position corresponding to the enlarged end and the first row of resistance heads is damaged, and the second row of resistance heads distributed in a cross-staggered manner applies resistance to the enlarged end. At this time, the position where the enlarged end is subjected to resistance is intact, and the supporting effect on the surrounding rock will not be affected by damage to the enlarged end.

[0025] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of by a person skilled in the art within the technical scope disclosed by the present invention without creative work should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope defined in the claims.

Claims

1. A large deformation controlled anchor cable for deep tunnels in coal mines, characterized by: The anchor cable comprises a No. 1 sleeve (1) and a No. 2 sleeve (6) of the same diameter; the No. 1 sleeve (1) is closed at one end and open at the other end, and is butt-jointed with one end of the No. 2 sleeve (6) with both ends open; A rod body (8) is provided with an enlarged end (4) at its head, the enlarged end (4) and part of the rod body (8) are inserted into a first sleeve (1) and a second sleeve (6), a plurality of insertion holes (11) are respectively provided at corresponding positions of the side walls of the enlarged end (4), the first sleeve (1) and the second sleeve (6), and the enlarged end (4), the first sleeve (1) and the second sleeve (6) are fixed by inserting a plug pin (3) into the insertion hole (11); A tray (9) is installed on the tail end of the rod body (8) extending out of the second sleeve (6), and the tray (9) is fixed to the tail end of the second sleeve (6) through a nut (7); A rigid spring (2) is installed between the top of the enlarged end (4) and the inner wall of the closed end of the No. 1 sleeve (1); A hook ring (10) is installed on the top of the enlarged end (4) and the inner wall of the closed end of the first sleeve (1), and the rigid spring (2) connects the enlarged end (4) and the first sleeve (1) through the hook ring (10); The inner wall of the No. 2 sleeve (6) is provided with a plurality of resistance heads (5).

2. A large deformation controlled anchor cable for deep tunnels in coal mines as claimed in claim 1, characterized in that: A reciprocating dynamic seal is achieved between the enlarged end (4) and the first sleeve (1) and the second sleeve (6).

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