An anti-collapse hole support device and method for a soft coal seam that is prone to instability

Abstract

The invention belongs to the technical field of coal mining, and in particular relates to a support device and method for an anti-collapse hole in a soft coal seam that is prone to instability, the device includes a plurality of support units, and the support unit includes a protection mechanism arranged in the borehole and a support mechanism for supporting the protection mechanism, the protection mechanism includes an upper support plate, a lower support plate symmetrically arranged with the upper support plate, and a plurality of composite A support column, the support mechanism includes a plurality of flexible airbags, and the plurality of flexible airbags are communicated through a ventilation pipeline. The use method of the device includes five steps: connecting a support mechanism, connecting a protection mechanism, pushing into a drill hole, connecting an air pipe and ventilating, and removing the air pipe. In the present invention, a flexible air bag is arranged between the upper and lower support plates, the upper and lower support plates are stretched through the ventilation of the flexible air bag, and the upper and lower support plates are supported by a composite support column.

Description

technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to an anti-slump hole support device and method for soft coal seam easily unstable drilling holes. Background technique [0002] Coal mining conditions in most areas of the country are harsh, the mining depth is large, the gas content in the coal seam is high, the pressure is high, the gas permeability of the coal seam is low, the geological structure conditions are complex, and gas accidents are prone to occur. Reducing and preventing gas accidents has become an urgent problem in the field of coal mine safety. The problem. At present, the most common method of gas drainage in my country is to use boreholes to pre-drain the coal seam gas in the mining face, and the most commonly used method of gas drainage is comprehensive gas drainage. Due to the soft coal in high-gassy soft coal seams, long-distance directional drilling is often prone to hole collapse after drilli...

AI Technical Summary

Problems solved by technology

The traditional method of hole collapse prevention and control usually adopts the lower screen pipe method. Due to the small space reserved between it and the hole wall, the delivery is difficult, and it is often difficult to deliver to the target position, and there are problems such as insufficient design strength.

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