Method for treating limestone gas emission of tunneling roadway

Abstract

The invention discloses a method for treating limestone gas emission of a tunneling roadway. The method comprises the following operation steps: punching a hole in the wall of an extraction tube to manufacture extraction floral tubes; connecting the extraction floral tubes, and arranging the extraction floral tubes in the roadway; arranging the extraction tube at the top of the roadway for communicating with all the extraction floral tubes, and meanwhile assembling a connecting tube outside the extraction tube; paving a plastic film in the roadway; arranging a metal mesh on the surface of the plastic film; mounting anchor rods and anchor cables to fix the metal mesh; spraying a concrete layer on the surface of the roadway; mounting a support on the roadway side, and mounting an extraction branch tube on the support; and using a connecting branch tube to communicate the connecting tube with the extraction branch tube, and mounting an extraction air valve in the middle of the connecting branch tube. According to the method, an isolating layer is built on the surface of a limestone tunneling roadway, and the extraction pipeline is designed on the inner side of the isolating layer for extraction, so that the problem that limestone gas in the tunneling roadway is difficult to treat due to the fact that existing drilling cannot be accurately constructed to limestone cracks is fundamentally solved.

Description

technical field [0001] The invention belongs to the technical field of limestone gas control, and in particular provides a method for controlling limestone gas gushing out of an excavation roadway. Background technique [0002] Studies have shown that in the process of peat metamorphism into coal, a large amount of gas gas will be produced, and the higher the degree of coal metamorphism, the greater the amount of gas gas produced. The gas gas in most coal fields will gradually change during the long geological change process. released into the air. However, in some coal fields, when the upper part of the coal seam is covered with thick mudstone or other well-sealed rock formations, it is difficult for the gas produced by coal metamorphism to escape, thus forming a high gas area. If the immediate top of the coal seam is thicker mudstone, the gas basically occurs in the coal seam. But when the coal seam is directly topped by limestone, and the upper part of the limestone is ...

AI Technical Summary

Problems solved by technology

When the excavation roadway is connected with these cracks, the high-concentration gas will continuously pour into the excavation roadway, causing the gas in the excavation roadway to exceed the limit, which will bring huge hidden dangers to the safe excavation of the roadway

[0003] At present, the control methods of limestone gas are mainly through drilling or grouting, but due to the random distribution of limestone fissures, it is often impossible to accurately drill holes in limestone fissures. , so it is difficult to achieve a satisfactory governance effect

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