Anchor net spraying-steel wire rope oblique cross coupling supporting method

Abstract

The invention discloses an anchor net spraying-steel wire rope oblique cross coupling supporting method. The method comprises the following steps that (1) roadway tunneling construction is conducted; (2) drill holes are formed in a roadway top plate, a roadway left shoulder and a roadway right shoulder, an anchoring agent is poured, and anchor rods are driven to the designed depth; (3) the steel wire mesh, the steel wire rope and the anchor rod are embedded and fixed through nuts to form a net-shaped structure; (4) primary spraying reinforcement construction; and (5) re-spraying support construction. The anchor rods are reasonably driven according to the size of the roadway, meanwhile, the steel wire ropes, the steel wire meshes and the anchor rods are connected through the rotary anchor rod drilling machine to form a steel wire net structure with a certain angle, roadway surrounding rock can be effectively and cooperatively controlled, the stability of the roadway surrounding rock is improved, and the supporting structure is good in integrity and high in reliability. The supporting technology is simple in construction operation, short in period, small in workload, safe, reliable and good in supporting effect.

Description

Technical field [0001] The present invention relates to the technical field of mining construction, particularly to an anchor mesh spray - wire rope obliquely coupled support method. Background [0002] With the rapid development of the coal industry and the continuous progress of mining technology, the number of mine roadways has grown rapidly, in order to ensure the stability of the surrounding rock of the roadway, prevent the collapse of the surrounding rock or produce excessive deformation, can not meet the normal production and safety requirements, the roadway needs to be supported immediately after excavation. Anchor support accounts for the largest proportion of mine roadway support, and a single anchor support is difficult to meet the requirements of roadway surrounding rock control, the existing anchor rod - anchor cable joint support design, anchor rod, anchor cable often to design anchor force as the maximum support capacity, but in the actual project, anchor rod - anc...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the coal industry and the continuous improvement of mining technology, the number of mine roadways has increased rapidly. In order to ensure the stability of the surrounding rock of the roadway and prevent the surrounding rock from collapsing or excessive deformation, which cannot meet the normal production and safety requirements, the roadway Immediate support after excavation

Bolt support accounts for the largest proportion of mine roadway support, and a single bolt support is difficult to meet the requirements of roadway surrounding rock control. In the existing bolt-bolt joint support design, bolts and anchor cables are often The design anchoring force is taken as the maximum support capacity, but in actual engineering, it is difficult to achieve the design anchoring force at the same time for the anchor rod and the anchor cable, and there are unreasonable design parameters and waste of support materials

With the delamination of the roadway roof within the bolt support range, the bolt or anchor cable will be stretched and deformed at this time, and the sinking amount will easily exceed the limit of the stretching amount, causing one side to be pulled first and lose stability, making the The actual support strength of the support system suddenly drops, which in turn induces unbroken anchor rods or anchor cables due to the sudden increase in the required support strength exceeding the actual support capacity, resulting in support damage, resulting in the complete failure of the combined support body of the anchor rod and anchor cable. failure, causing large-scale collapse of the roof of the roadway, so how to correctly, safely and effectively select the roadway support method for roadway support is particularly important

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