Y-shaped ventilation working face goaf top pipe gas extraction method

Abstract

The invention belongs to the technical field of goaf gas extraction, and particularly relates to a Y-shaped ventilation working face goaf top pipe gas extraction method. The method comprises the following steps that S100, on the side, close to a goaf, of a filling roadway, a telescopic jack is used for jacking a top pipe obliquely upwards, and screen meshes are uniformly formed in the front end of the top pipe; the whole top pipe is completely jacked, and large rocks are avoided in the pipe jacking process; S200, after the jacking of the top pipe is completed, a drainage pipe is prepared, the drainage pipe is quickly inserted into the top pipe, and the drainage pipe is fixed to prevent the situation that the hole sealing quality is affected by shaking; S300, after 5 minutes of hole sealing, a polyurethane solution starts to foam and expand, the foam can permeate into the goaf through the screen meshes in the top pipe to block gaps, foaming is stopped after 20 minutes, and hardening and solidification are gradually carried out; and S400, after 1 hour of polyurethane hole sealing, the drainage pipe is connected with an extraction pipeline for gas extraction, an observation hole and a valve are arranged on the extraction pipeline and are used for sampling gas, and spontaneous combustion ignition marking gas is detected at any time.

Description

technical field [0001] The invention belongs to the technical field of goaf gas drainage, in particular to a pipe jacking gas drainage method in a goaf of a Y-shaped ventilated working face. Background technique [0002] When the coal mining face adopts the Y-shaped ventilation method, it is easy to cause the gas in the goaf to escape to the supplementary roadway, causing the gas concentration in the supplementary roadway to exceed the limit. Intubation in the goaf to extract gas. However, as the support of the working face moves back, the goaf caving, and gangue accumulation in the caving zone, the intubation construction is more difficult, and the extraction efficiency is low. Aiming at the status quo of gas management in roadway filling in the goaf, a pipe-jacking gas drainage method that improves drainage efficiency is urgently needed. Contents of the invention [0003] In order to solve the above problems, the present invention provides a pipe-jacking gas drainage m...

AI Technical Summary

Problems solved by technology

However, as the support of the working face moves back, the goaf caving, and gangue accumulation in the caving zone, the intubation construction is more difficult, and the extraction efficiency is low

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