Silica sol injection wall caving prevention device for coal wall of loose thick coal seam containing dirt band and construction process

Abstract

The invention relates to the technical field of coal seam environment-friendly material grouting, in particular to a wall caving prevention device for injecting silica sol into a coal wall of a loose thick coal seam containing dirt band and a construction technology. The proportion concentration of the silica sol and the clear water is 25%, the grouting amount per ton of coal is 125 kg, the cohesive force and the internal friction angle of a coal body can be enhanced, the internal strength of the coal body is improved, a grouting area is reinforced into an integral structure, and wall caving and roof caving of a coal wall are prevented. According to the application in working face coal wall grouting and roadway roof advanced grouting, the internal strength of a coal body is fully reinforced, the grouting parameter design is reasonable and standard, the method is suitable for most of implementation scenes, the grouting system adopts automatic flow control for concentration proportioning, the labor of workers is greatly relieved, the method is very safe, unreasonable supporting expenditure is reduced, and the construction efficiency is improved. The benefits are improved.

Description

technical field [0001] The invention relates to the technical field of grouting of coal seam environmental protection materials, in particular to a device for injecting silicon sol to prevent chipping into the coal wall of a loose thick coal seam containing gangue and a construction process. Background technique [0002] At present, energy is increasingly scarce, and coal seam mining geology is becoming more and more complex. In order to strengthen the concept of environmental protection, implement green mining, and protect the original environment, coal seams that were previously difficult to mine are now being mined using new technologies. It can be found that the working face in the field of mining engineering Mining heights and depths are increasing year by year, loose coal seams, high-gas mines and other complex coal seams provide technical support for coal seam mining through reasonable water injection and grouting, reducing mining difficulty and maintenance costs, maki...

AI Technical Summary

Problems solved by technology

During the grouting process, it was found that workers were required to carry materials (cement, water glass) to prepare the slurry. At the same time, it was necessary to visually inspect the grouting state on the working surface and manually open and close the valve of the water injection pipeline, which was labor-intensive and inefficient. also has a certain risk

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