An anchor injection structure

Abstract

The invention discloses an anchor injection structure, which includes an anchoring part, a grouting part and a protective part; The small-diameter hole section of the step bolt hole in the injected rock mass is anchored; the grouting part includes a liquid inlet pipe, a tail sleeve, an outer sleeve, an inner sleeve, blades, a grout stopper and an inner sealing sleeve, and the grouting part is a hollow structure , set on the outside of the anchor rod or anchor cable; the liquid inlet pipe is inserted into the liquid inlet of the boot, the outer sleeve is inserted into the first inner hole of the boot, and the inner sleeve is inserted into the third inner hole of the boot , an annular space is formed between the outer sleeve and the inner sleeve, the slurry stop sleeve is set on the end of the outer sleeve, and the blade is fixedly connected with the outer cylindrical surface of the inner sleeve. The invention can meet the grouting requirements of the surface rock mass, realize anchoring within the range of the full drilling length, improve the shearing resistance of the anchoring, maintain the end anchoring effect of the anchor cable, and improve the anchoring effect and safety.

Description

technical field [0001] The invention belongs to the technical field of surrounding rock control in coal mines or other underground engineering, and in particular relates to an anchor grouting structure. Background technique [0002] The vast majority of my country's coal production is underground mining, and the safe and efficient tunneling of roadways is an important condition to ensure underground coal mining. With the increase of mining depth, the mining conditions are more severe, and the roadway surrounding rocks are more and more broken. The safety maintenance of such roadways is an important guarantee for mine production. According to theories such as loose circles, after the underground rock mass is excavated, a broken loose circle will be formed around the excavation space. The closer to the excavation surface, the more broken the rock mass is, and the more complete the internal rock mass. In general, according to the ratio of the anchorage to the length of the anc...

AI Technical Summary

Problems solved by technology

Full-length anchoring, or the method of end anchoring and free segment grouting can improve the shear resistance of the anchor cable, but the anchor cable is bonded to the surrounding rock almost in the full length range, and the anchoring force effect on the rock mass is not as good as that of the end anchor ; When the anchor cable is broken in the anchor section, it is difficult to reflect it to the outside, and there is a potential safety hazard

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