Construction method of precise intersecting drainage holes in coal mine underground roadway

Abstract

A construction method for accurately penetrating drainage holes in underground tunnels of coal mines, comprising a combination of directional drilling tools for accurate piercing, a back-pulling reaming bit, a wall-protecting steel casing, and the like. The hole trajectory control technology is used to construct accurate piercing holes to connect the outlet roadway and the drainage roadway. After the drilling is pierced, the back-towing reaming bit is replaced without lifting the drill to reversely expand, repeat the multi-stage reaming, and replace it in the opposite roadway. Change the diameter, connect the large-aperture protective casing, use the back-towing type to run the protective casing in the whole process, grouting and solidify, and install the drainage flower pipe for filtering the sundries in the water outlet roadway. Precise piercing and large-diameter casing run in the whole process, so as to effectively replace the excavation construction of special drainage roadway, and greatly reduce the cost of coal mine water hazard control.

Description

technical field [0001] The invention relates to the technical field of construction of drainage holes for water prevention and control in underground coal mines, and in particular to a construction method for precisely piercing drainage holes in underground roadways of coal mines. Background technique [0002] With the gradual deepening of coal mine mining depth and the further expansion of mining scope, the underground geological conditions of coal mines are complex and changeable. It is often necessary to excavate a special drainage roadway before mining at the working face threatened by water damage to prevent water gushing and flooding during the mining process. dangerous situation. However, the excavation process of long-distance special water diversion roadway is time-consuming, costly, and construction efficiency is low. [0003] For this reason, in view of the above-mentioned defects, the designer of the present invention, through painstaking research and design, an...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a construction method for accurately interfacing drainage holes in coal mine underground roadways, which connects the water outlet roadway and the drainage roadway, and adopts the reverse pull-back type reaming process for multi-stage reaming. wall, to achieve the purpose of effective drainage, used to replace the special drainage roadway excavation, to solve the problems of high cost, long cycle and serious pollution of roadway excavation

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