Method for rapid discharge of gas in tunnel

Abstract

The invention specifically relates to a method for rapid discharge of gas in a tunnel, which can solve the problems of high cost and high failure rate of ventilation equipment by adopting long-time enhanced ventilation on the gas in the existing tunnel. The method adopts the following steps: a) drilling a hole at the lower part of a tunnel driving face, proving up the position of a coal seam and detecting gas exposure amount and concentration; b) inserting a gas guide pipe which is sealed at the outer end and sealed with the hole at the lower part of the driving face into the hole at the lower part of the driving face; c) spraying concrete on the driving face for forming a leak-proof wall; d) drilling the hole at the upper part of the driving face, and inserting an exhaust pipe which is sealed at the outer end and sealed with the hole at the upper part into the hole at the upper part; e) introducing high-pressure gas at the outer end of the gas guide pipe, and pressing the gas in the coal seam to the upper part of the coal seam; and f) opening a seal at the outer end of the exhaust pipe, discharging the gas, ventilating, and discharging the gas out of the tunnel. The means of improving the pressure of a gas-containing formation is utilized for rapidly discharging the gas, and the enhanced ventilation centralized treatment is used, thereby having the obvious energy-saving effect and achieving the purpose of reducing the ventilation cost; and the method is applied in the construction of highways, railways and hydraulic tunnels and can also be used in other types of underground projects.

Description

technical field [0001] The invention relates to a tunnel gas discharge technology, in particular to a tunnel gas rapid discharge method. Background technique [0002] In recent years, with the development of engineering technology and society, there are more and more tunnel construction projects such as highways, high-speed railways, and water diversion projects, which inevitably encounter gas-containing geology such as coal seams and goafs. At present, the construction of gas tunnels is mainly based on the mature technology of coal mines to deal with gas, and a set of feasible methods has been formed. Generally, the press-in ventilation dilution method is used (to reduce it to below the non-explosive concentration and below the harmful concentration to the human body, and gradually squeeze it out of the hole). Among them, the corresponding safety regulations forcefully stipulate that the wind speed in the ordinary tunnel is not less than 0.15m / s, the minimum wind speed in ...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of high cost and high failure rate of ventilation equipment in existing tunnels in which gas is ventilated for a long time, it provides a method for quickly discharging gas in tunnels

During operation, by setting air guide pipes and exhaust pipes on the excavation surface and the lower part, and taking advantage of the light quality of gas, the gas in the coal seam is moved upwards through high-pressure air, accumulated and then discharged through the exhaust pipe, which overcomes the tunnel There are problems of high cost and high failure rate of ventilation equipment in the long-term intensive ventilation of gas in the interior