Step-by-step strengthening method by anchoring and forming hole in downward sleeve of cracking medium

Abstract

The invention relates to a step-by-sep strengthening method by anchoring and forming a hole in a downward sleeve of cracking medium. According to the strengthening method, a hollow grouting anchor rope of a related large-aperture pretension bottom plate comprises a fastening section A, a grouting section B and an anchoring section C, and the strengthening method mainly aims at solving the difficulties that holes are not easy to form in a weak and broken roadway bottom plate, a hole forming wall is poor in stability and suffers from hole collapse easily, and the bottom plate is difficult to anchor and strengthen. According to the strengthening method, the large-aperture wall protecting sleeve at the shallow part is grouted, so that the problems of hole collapse of the hole wall is solved, meanwhile high-flow high-pressure grouting is realized, the grouting time is saved, the slurry dispersion range is enlarged, a whole support structure is formed by utilizing a grouting anchor rope and a steel beam, the anchoring and the common loading of the anchor rope are realized simultaneously when a cracking rock body is grouted for fixing, and the great deformation of the bottom plate is solved effectively, and in addition, according to the method, the construction is easy, the operation is simple and convenient, the effect is obvious, the safety and the reliability are realized, and wide practicability is achieved.

Description

technical field [0001] The invention relates to a rapid hole-forming and reinforcement technology in the fragmentation medium of the bottom plate of a mine roadway, in particular to a step-by-step reinforcement method for forming holes in the casing with the fragmentation medium down and anchoring. Background technique [0002] As we all know, soft rock support in deep wells with high ground pressure has always been a major technical problem in the maintenance of underground engineering such as coal mining, and it has also been a key research direction in the field of underground mining at home and abroad for decades. Among them, the bottom heave of soft rock roadway is a key technical problem affecting the success or failure of high ground stress soft rock roadway support. The roadway is the channel for safe production in coal mines, and it is called the "throat" of the mine, and the importance of floor treatment is self-evident. At present, the domestic and foreign techni...

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Problems solved by technology

[0004] In order to overcome the deficiencies in the rapid hole formation and reinforcement technology in the existing mine roadway floor fragmentation medium, the present invention provides a kind of fragmentation medium down casing Hole forming and anchor injection step-by-step reinforcement method, this reinforcement method uses shallow large-diameter casing casing grouting, which solves the problem of hole wall collapse, and realizes high-flow high-pressure grouting, saves grouting time and increases grout diffusion range, using grouting anchor cables and steel beams to form an integral support structure, while grouting consolidates the broken rock mass, the full-length anchorage and joint bearing of the anchor cables can be realized at the same time, effectively solving the problem of large deformation of the floor. In addition, this method is easy to construct and operate Simple and convenient, and effective, safe and reliable, with a wide range of practicability

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