Hole collapse prevention supporting device and method for unstable drill hole of soft coal bed

Abstract

The invention belongs to the technical field of coal mining and particularly relates to a hole collapse prevention supporting device and method for an unstable drill hole of a soft coal bed. The device comprises a plurality of supporting units. Each supporting unit comprises a protection mechanism arranged in the drill hole and a supporting mechanism used for supporting the protection mechanism. Each protection mechanism comprises an upper supporting plate, a lower supporting plate and a plurality of composite supporting columns, wherein the upper supporting plate and the lower supporting plate are arranged symmetrically, and the composite supporting columns are arranged between the upper supporting plate and the lower supporting plate. Each supporting mechanism comprises a plurality of flexible air bags which communicate through an air introducing pipeline. The using method of the device comprises the five steps of connecting the supporting mechanisms, connecting the protection mechanisms, pushing the device into the drill hole, connecting an air pipe and introducing air and disassembling the air pipe. According to the hole collapse prevention supporting device and method for theunstable drill hole of the soft coal bed, the flexible air bags are arranged between the upper supporting plates and the lower supporting plates, the upper supporting plates and the lower supporting plates are separated by introducing air into the flexible air bags and are supported through the composite supporting columns, and the device is easy to transfer, good in supporting effect and convenient to use and popularize.

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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