CN105863699A - Grouting reinforcing large-deformation anchor bolt and method using grouting reinforcing large-deformation anchor bolt to reinforce rock body - Google Patents

Abstract

The present invention provides a grouting reinforced large deformation bolt and a method of using it to strengthen rock mass. Both ends are slidably arranged in the casing, and a damping part for preventing the rod from sliding toward the outside of the casing is provided between the ends of the two sections of the rod body and the casing, and the outer side of one end of the anchor rod is sleeved to prevent the slurry from The grout stopper that overflows the fixing hole of the anchor rod, the outer side of the grout stopper is pressed and provided with a grout stopper fixing part. In order to solve the problem that the existing bolts are easily damaged due to the large tensile stress in the deep roadway, and the material cost of the large deformation anchor rod is high, which is not suitable for large-area use, and although the existing large deformation anchors The rod played a certain role, but the breakage of the anchor rod was still the most important factor leading to the failure of the final support. The invention belongs to the field of rock mass reinforcement in mining areas.

Description

Grouting to strengthen large deformation bolt and the method of using it to strengthen rock mass

technical field

The invention relates to a grouting reinforcement bolt and a reinforcement method, belonging to the field of rock mass reinforcement.

Background technique

At present, as the mining depth continues to increase, the surrounding rock pressure also continues to increase. In the face of the weak rock mass and high ground stress in the deep part, the currently known bolts are easily damaged due to the large tensile stress in the deep roadway, and When the degree of fracture of the rock mass is high, the anchoring effect of the bolt is also prone to failure. Based on such problems, improvements are made and it is expected to play a role in actual production.

However, there are also some problems in some existing bolts with large deformation due to compression, mainly as follows:

(1) The cost of large deformable materials is relatively high, which is not suitable for large-scale use, and the cost still needs to be reduced in the face of common deep mining problems;

(2) The design is unsatisfactory. Although it has played a certain role, the breaking of the anchor rod is still the most important factor leading to the failure of the final support.

Contents of the invention

The purpose of the present invention is to provide a grouting method for strengthening large deformation bolts and using it to strengthen rock mass, so as to solve the problem that the existing bolts are easily damaged due to the large tensile stress in the deep roadway, and the compression The material cost of large-deformation bolts is high and is not suitable for large-area use. Although the existing large-deformation bolts have played a certain role, the breakage of the bolts is still the most important factor leading to the failure of the final support.

The solution of the present invention is as follows: a grouting reinforced large-deformation anchor rod, the anchor rod is formed by sequentially butting at least two rod bodies through sleeves along the length direction, and the opposite ends of the two adjacent rod bodies are slidably arranged on the In the casing, and between the ends of the two rods and the casing, there is a damping part for preventing the rod from sliding towards the outside of the casing, and the outer side of one end of the anchor rod is provided with a fixing hole for preventing the slurry from overflowing the anchor rod The outer side of the grout stopper is pressed and provided with a grout stopper fixing part.

The grout plug fixing part includes a nut screwed and sleeved on the anchor rod and a backing plate arranged between the nut and the grout stopper, and the backing plate compresses the grout stopper by tightening the nut.

One end of the anchor rod is provided with an anchor head, and the other end is provided with a grout plug. A grout hole is provided in the rod body of the anchor rod along its length direction, and a grout discharge hole connected with the grout hole is provided on the side wall of the rod body. hole;

The damping part is the damping material filled between the end of the rod body and the sleeve, and the resistance of the damping part is greater than the initial pre-tightening force received by the rod body in the axial direction;

The method for strengthening the rock mass by using the above-mentioned bolts includes:

The steps of introducing the anchor rod into the rock mass: when the anchor rod is introduced into the rock mass, the anchor head is glued into the inner rock mass by the drug roll;

The step of injecting grout into the rock body through the anchor rod: tighten the nut so that the backing plate compresses the grout stopper between the opening of the anchor rod introduction hole and the anchor rod to prevent the grout from overflowing, The grout hole and the grout hole connected with the grout hole pour grout into the rock body, and as the grout solidifies, the bolt and the rock mass form a whole;

Under the action of external force, when the stress of the rock mass changes again, the anchor rod is subjected to additional tensile stress. At this time, the rod body inside the casing slides outward because the tensile force is greater than the resistance of the damping part, and part of the length of the rod body is released. The stress of the body is released. During this process, the damping part is continuously compressed, and the resistance of the damping part to the rod body gradually increases. Then, the tension on the rod body and the resistance of the damping part are balanced again, and the rock mass is stable again.

Compared with the prior art, the present invention has the main advantages that: under the action of external force, when the rock mass undergoes a large stress change, the bolt can be extended in length, so that the stress of the rock mass is released and re-stabilized, and this process is of great importance to the rock mass. The damage of the bolt is small, which improves the service life of the bolt. While strengthening the stability of the rock mass, it can withstand the deformation of the surrounding rock of the roadway to a greater extent, and the structure is simple. In addition, because the material of the bolt is ordinary, compared with For other new materials with large deformation, it can greatly save the cost of support, and can also save the amount of bolts used while stabilizing the rock mass for the second time.

Description of drawings

Fig. 1 is the structural representation of this anchor rod;

Fig. 2 is the sectional view of casing part in this bolt;

Fig. 3 is a work change diagram of Fig. 2 .

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings,

Example:

Referring to Figures 1, 2 and 3, this embodiment provides a grouting reinforced large-deformation anchor rod, which is formed by sequentially connecting four sections of rod body 1 through sleeves 2 along the length direction (the rod bodies 1 are all coaxially arranged) One end of the anchor rod is provided with an anchor head 8, and the other end is provided with a grout plug 9. The rod body 1 in the anchor rod is provided with a grout hole 11 along its length direction, and the grout hole 11 of two adjacent rod bodies 1 is connected. The side wall of the rod body 1 is provided with a slurry outlet hole 12 connected with the slurry inlet hole 11, and the opposite ends of the adjacent two sections of the rod body 1 are slidingly arranged in the casing 2, and the ends of the two sections of the rod body 1 A damping part 3 for preventing the rod body 1 from sliding towards the outside of the sleeve pipe 2 is provided between the casing 2, the damping part 3 is the damping material filled between the end of the rod body 1 and the casing 2, and The resistance of the damping part 3 is greater than the initial pre-tightening force received by the rod body 1 in the axial direction, and the outer side of one end of the anchor rod is provided with a grout stopper 4 for preventing the slurry from overflowing the anchor rod fixing hole, and the outer side of the grout stopper 4 is pressed and set There is a grout stopper fixing part 5. The grout stopper fixation part 5 includes a nut 6 that is sleeved on the anchor rod and a backing plate 7 arranged between the nut 6 and the grout stopper 4. By tightening the nut 6, the The backing plate 7 compresses the grout stopper 4 tightly.

Claims (5)

1. A grouting reinforced large deformation anchor rod, characterized in that: the anchor rod is formed by at least two sections of rod bodies (1) sequentially butted through sleeves (2) along the length direction, and the adjacent two sections of rod bodies (1) Both opposite ends are slidably arranged in the casing (2), and there are gaps between the ends of the two rods (1) and the casing (2) to prevent the rod (1) from moving toward the casing (2). The damping part (3) that slides in the external direction, the outer side of one end of the anchor rod is provided with a grout stopper (4) for preventing the slurry from overflowing the anchor rod fixing hole, and the outer side of the grout stopper (4) is pressed with a grout stopper Plug the fixing part (5). 2. A grouting reinforced large-deformation anchor according to claim 1, characterized in that: the grout stopper fixing part (5) includes a nut (6) that is screwed and sleeved on the anchor and is arranged on The backing plate (7) between the nut (6) and the grout stopper (4), by tightening the nut (6), the backing plate (7) compresses the grout stopper (4). 3. A kind of grouting reinforced large deformation bolt according to claim 1, characterized in that: one end of the bolt is provided with an anchor head (8), and the other end is provided with a grout plug (9), The rod body (1) is provided with a pulp inlet hole (11) along its length direction, and a pulp outlet hole (12) connected with the pulp inlet hole (11) is provided on the side wall of the rod body (1). 4. A grouting reinforced large deformation bolt according to claim 1, characterized in that: the damping part (3) is the damping part filled between the end of the rod body (1) and the casing (2) material, and the resistance of the damping part (3) is greater than the initial pre-tightening force axially received by the rod body (1). 5. Utilize the method for bolt reinforcement rock mass described in claim 3, it is characterized in that, comprising: The steps of introducing the anchor rod into the rock mass: when the anchor rod is introduced into the rock mass, the anchor head is glued into the inner rock mass by the drug roll; The step of injecting grout into the rock body through the anchor rod: press the grout stopper (4) between the opening of the anchor rod introduction hole and the anchor rod through the grout stopper fixing part (5), The grout hole (11) and the grout outlet hole (12) connected with the grout hole (11) pour grout into the rock body, and as the grout solidifies, the bolt and the rock mass form an integral body; Under the action of external force, when the stress of the rock mass changes again, the anchor rod is subjected to additional tensile stress. At this time, the rod body (1) inside the casing (2) is greater than the resistance of the damping part (3). The external sliding part of the length of the rod body (1) is released, and the stress of the rock mass is released. During this process, the damping part (3) is continuously compressed, and the resistance of the damping part (3) to the rod body (1) gradually increases. Then the tensile force received by the rod body (1) and the resistance of the damping part (3) reach a balance again, and the rock mass reaches stability again.