Tunnel rock-burst prevention supporting device and construction method

Abstract

The application discloses a tunnel rock-burst prevention supporting device and a construction method, and belongs to the technical field of tunnel rock-burst prevention supporting. The device comprises a supporting net, a protection rope for fixing the supporting net on a tunnel, a protection bolt for fixing the protection rope, a plurality of locking pulleys and a force releasing pulley; the plurality of locking pulleys are arranged behind the protection bolt in sequence; the force releasing pulley is arranged on the last side of the plurality of locking pulleys; one end of the protection rope is fixed on the supporting net; the other end of the protection rope is fixed on the tunnel through the protection bolt; the plurality of locking pulleys are arranged outside the force releasing pulley and then fixed through the protection bolt; after rock-burst occurs, the force generated in the instant when the protection rope is separated is relieved through the locking pulleys and the force releasing pulley, so that the supporting net is prevented from being separated from the tunnel, and harm and personnel injury are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel rock burst prevention and support, in particular to a tunnel rock burst prevention and support device and a construction method. BACKGROUND

[0002] Rock burst refers to a sudden and violent failure phenomenon of a free-standing rock mass in a deep or high tectonic stress area of underground mining. This phenomenon is also known as rock burst. The cause of the phenomenon is that the strain energy accumulated in the free-standing rock mass is suddenly and violently released, causing the rock mass to break like an explosion. The impact ground pressure causes a large amount of rock to collapse, and produces a loud noise and air wave impact, which not only can destroy the mine, but also can endanger ground buildings.

[0003] Tunnel rock burst refers to a rock mass failure activity occurring during tunnel construction, which is a more violent rock mass failure process than tunnel collapse, and causes more damage to people and equipment. Most of the prevention and control of rock burst, especially the design of support measures, adopts the concept of passive protection, that is, relying on the strength of the support structure itself to resist possible rock burst disasters. The support measures under this prevention and control concept cannot timely apply radial stress to the tunnel wall to improve the stress state of the tunnel wall. At the same time, the release of deformation energy in the rock mass during rock burst prevention and control cannot be achieved, resulting in poor rock burst prevention and control effect.

[0004] When tunnel rock burst occurs, external radial restraint force is quickly applied to the tunnel wall, causing the support device to be stressed to a set value and begin to displace, affecting construction safety. SUMMARY

[0005] In order to overcome the defects of the prior art, the technical problem to be solved by the present application is to provide a tunnel rock burst prevention and support device and a construction method. After rock burst occurs, the force generated when the protection rope is detached is relieved through the locking pulley and the force relief pulley, preventing the support net from detaching from the tunnel and causing harm and injuries to personnel.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] The preferred technical solution of the present application is to fix the support net on the tunnel with a protection rope and a protection bolt for fixing the protection rope, and further comprises a plurality of locking pulleys and a force relief pulley. The plurality of locking pulleys are arranged in sequence behind the protection bolt, and the force relief pulley is arranged on the last side of the plurality of locking pulleys. One end of the protection rope is fixed on the support net, and the other end of the protection rope is fixed on the tunnel through the protection bolt. The protection rope is wound outside the force relief pulley through the plurality of locking pulleys and then fixed through the protection bolt.

[0008] The preferred technical scheme of the present application is that the plurality of locking pulleys are not on the same horizontal line and are arranged in an arc shape.

[0009] The preferred technical scheme of the present application is that the force releasing pulley and the plurality of locking pulleys are not on the same horizontal line.

[0010] The preferred technical scheme of the present application is that the support net is provided with the plurality of protective ropes.

[0011] The preferred technical scheme of the present application is that the diameter of the force releasing pulley is greater than that of the plurality of locking pulleys.

[0012] The preferred technical scheme of the present application is that after the two ends of the protective rope are fixed on the protective peg, the protective rope is in a tight state.

[0013] The preferred technical scheme of the present application is that the method comprises the following steps: step S00, determining the tunnel part with the greatest force through detection during construction of the tunnel;

[0014] Step S10, arranging the support net on the part;

[0015] Step S20, fixing the protective rope on the support net, and then fixing one end of the protective rope through the protective peg;

[0016] Step S30, subsequently arranging the plurality of locking pulleys in sequence behind the protective peg, and each of the locking pulleys is not on the same horizontal line;

[0017] Step S40, after the arrangement is completed, installing the force releasing pulley behind the last locking pulley;

[0018] Step S50, after the protective rope is placed on the plurality of locking pulleys, the protective rope is wound around the outside of the force releasing pulley;

[0019] Step S60, the protective rope is returned to the protective peg and is fixed through the protective peg.

[0020] The present application has the following beneficial effects:

[0021] The technical problem to be solved by this invention is to provide a tunnel rockburst prevention support device and construction method, including a support net, a protective rope for fixing the support net to the tunnel, and a protective bolt for fixing the protective rope. It also includes a plurality of locking pulleys and stress-relieving pulleys. The locking pulleys are arranged sequentially after the protective bolts, and the stress-relieving pulleys are arranged on the last side of the locking pulleys. One end of the protective rope is fixed to the support net, and the other end is fixed to the tunnel by the protective bolts. The rope is secured by the protective bolts after being surrounded by the locking pulleys and wrapped around the stress-relieving pulleys. In the event of a rockburst, the force generated when the protective rope detaches is relieved by the locking pulleys and stress-relieving pulleys, preventing the support net from detaching from the tunnel and causing damage or injury to personnel. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the tunnel rockburst prevention support device provided in a specific embodiment of the present invention;

[0023] In the picture:

[0024] 1. Support net; 2. Protective rope; 3. Protective bolt; 4. Locking pulley; 5. Force-releasing pulley. Detailed Implementation

[0025] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, the present invention provides a tunnel rockburst prevention support device and construction method, including a support net 1, a protective rope 2 for fixing the support net 1 to the tunnel, and a protective bolt 3 for fixing the protective rope 2. It also includes a plurality of locking pulleys 4 and a stress-relieving pulley 5. The plurality of locking pulleys 4 are arranged sequentially after the protective bolt 3, and the stress-relieving pulleys 5 are arranged on the last side of the plurality of locking pulleys 4. One end of the protective rope 2 is fixed to the support net 1, and the other end of the protective rope 2 is fixed to the tunnel by the protective bolt 3. After being surrounded by the stress-relieving pulleys 5 by the plurality of locking pulleys 4, it is fixed by the protective bolt 3.

[0027] Preferably, the locking pulleys 4 are not on the same horizontal line, but are arranged in an arc shape.

[0028] Preferably, the force-releasing pulley 5 and the locking pulleys 4 are not on the same horizontal line.

[0029] Preferably, the support net 1 is equipped with a number of protective ropes 2.

[0030] Preferably, the diameter of the force-releasing pulley 5 is larger than that of the locking pulleys 4.

[0031] Preferably, after both ends of the protective rope 2 are fixed on the protective peg 3, the protective rope 2 is in a tight state.

[0032] Preferably, the method comprises the following steps: step S00: determining the tunnel part with the heaviest force through detection during construction of the tunnel;

[0033] Step S10: arranging the supporting net 1 at the part;

[0034] Step S20: fixing the protective rope 2 on the supporting net 1, and then fixing one end of the protective rope 2 through the protective peg 3;

[0035] Step S30: subsequently arranging a plurality of locking pulleys 4 in sequence behind the protective peg 3, and each locking pulley 4 is not on the same horizontal line;

[0036] Step S40: after the arrangement is completed, installing a force-releasing pulley 5 behind the last locking pulley 4;

[0037] Step S50: after the protective rope 2 is placed on the plurality of locking pulleys 4, the protective rope 2 is wrapped around the outside of the force-releasing pulley 5;

[0038] Step S60: the protective rope 2 is returned to the protective peg 3 and fixed through the protective peg 3.

[0039] After the installation is completed, when rock burst occurs in the tunnel, the force generated in an instant will make the protective rope 2 separate from the protective peg 3 and drive the supporting net 1 to separate from the tunnel rock wall. Due to the design of the locking pulley 4 and the force-releasing pulley 5, the protective rope 2 will slide on the two pulleys first when it separates, and the impact force of the rock burst is released. In addition, the protective rope 2 is arranged at each part of the supporting net 1, which can effectively prevent the supporting net 1 from separating from the rock wall and prevent great construction safety problems and personnel loss.

[0040] The present application is described through preferred embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present application. The present application is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of the present application are within the scope of protection of the present application.

Claims

1. A tunnel rockburst prevention support device, comprising a support net (1), a protective rope (2) for fixing the support net (1) to the tunnel, and a protective bolt (3) for fixing the protective rope (2), characterized in that: It also includes several locking pulleys (4) and force-releasing pulleys (5). Several locking pulleys (4) are arranged in sequence behind the protective bolts (3). The force-releasing pulleys (5) are arranged on the last side of several locking pulleys (4). One end of the protective rope (2) is fixed to the support net (1). The other end of the protective rope (2) is fixed to the tunnel by the protective bolts (3). After passing through several locking pulleys (4), it is fixed by the protective bolts (3) after surrounding the outside of the force-releasing pulleys (5). Several of the locking pulleys (4) are not on the same horizontal line, forming an arc-shaped arrangement; The force-releasing pulley (5) and several of the locking pulleys (4) are not on the same horizontal line.

2. The tunnel rockburst prevention support device according to claim 1, characterized in that: The support net (1) is equipped with a number of the protective ropes (2).

3. The tunnel rockburst prevention support device according to claim 1, characterized in that: The diameter of the force-releasing pulley (5) is larger than that of several of the locking pulleys (4).

4. The tunnel rockburst prevention support device according to claim 1, characterized in that: After both ends of the protective rope (2) are fixed to the protective bolt (3), the protective rope (2) is in a taut state.

5. A construction method for a tunnel rockburst prevention support device, characterized in that: Apply the tunnel rockburst prevention support device as described in claim 1; The steps include: Step S00: In the construction tunnel, the part of the tunnel that is under the heaviest stress is determined by testing; Step S10: Install the support net (1) at this location; Step S20: Fix the protective rope (2) to the support net (1), and then fix one end of the protective rope (2) with the protective bolt (3); Step S30: Then, several locking pulleys (4) are arranged in sequence behind the protective bolt (3), and each locking pulley (4) is not on the same horizontal line; Step S40: After the arrangement is completed, install the force-releasing pulley (5) behind the last locking pulley (4); Step S50: After placing the protective rope (2) on several locking pulleys (4), wrap it around the outside of the force-releasing pulley (5); Step S60: The protective rope (2) returns to the protective bolt (3) and is fixed by the protective bolt (3).

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