Piston type graded grouting anchor cable and grouting method

Abstract

The invention relates to a piston type graded grouting anchor cable and a grouting method in the technical field of safe and efficient mining of coal mine resources. The piston type graded grouting anchor cable comprises an anchor cable body, a lock, an anchor cable tray, a screwed plug, a grout stop plug, a piston pushing device, a grout stop film, a grouting hole, a water stop strip and an end self-anchoring device, wherein the piston pushing device comprises an inner piston ring, an outer piston ring and the grout stop film; a pressure sensor is mounted on the piston pushing device; and the grout stop film is attached to the rear portion of the piston pushing device. The piston type graded grouting anchor cable is convenient and fast to machine, the grouting pressure of the anchor cable can be automatically and dynamically adjusted through the piston pushing device, and graded and partitioned stable-pressure grouting is conducted in sequence from inside to outside and from deep to shallow under the rated grouting pressure; and through the end self-anchoring device, end anchoring is conducted without a resin cartridge, mounting is fast during grouting, operation is convenient, economic benefits are good, the supporting effect is greatly improved, and the engineering problems that in the prior art, preferential permeation is likely to happen during roadway shallow grouting, and consequently shallow grout leakage and low deep grouting efficiency are caused are effectively solved.

Description

technical field [0001] The invention relates to the technical field of safe and efficient mining of coal mine resources, in particular to a piston-type graded grouting anchor cable and a grouting method. Background technique [0002] In the field of geotechnical engineering, vertical grouting or traditional anchor cables and bolt reinforcement are usually used for broken rock mass. With the increase of coal mine mining depth, mine mining conditions become more and more complex, and roadway support becomes more and more difficult. The problem of mine pressure control has become a difficult problem restricting mine development. In order to ensure the support effect of the surrounding rock of the roadway, grouting reinforcement methods such as grouting anchor cables and grouting anchor rods are usually used to improve the support strength. Anchor-frame joint support", "anchor-anchor joint support", "long and short anchor cables combined with grouting support", or adopt multipl...

AI Technical Summary

Problems solved by technology

[0003] Although conventional grouting anchor cables can improve the support effect of the roadway to some extent, in high-stress roadways, the superficial surface of the roadway is easy to infiltrate preferentially, resulting in superficial grout running, and at the same time, resin coils are required for anchoring, resulting in low efficiency of deep grouting , the rod body is long, insufficient grouting pressure causes insufficient grouting in the cracks of the surrounding rock, the slurry diffusion radius is small, and the support effect is not ideal, resulting in complicated procedures, slow construction speed, low efficiency and high cost

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