Construction method for precision perforation drainage holes in coal mine underground roadways

Abstract

A construction method for precision perforation drainage holes in coal mine underground roadways comprises a precision opposed perforation directional drilling tool assembly, a pull back-type reaming bit, a wall protective steel casing and the like. The method utilizes a measurement while drilling system, a deflecting drilling tool and a precise drilling track control technology to work accurately to perforate drilling holes to connect a water outlet roadway and a drainage roadway, after the drilling holes are perforated, the pull back-type reaming bit is replaced to expand in the reverse direction without lifting a drill, multistage reaming is conducted repeatedly, a variable diameter is changed in a perforation roadway, the wall protective casing with a large aperture is connected, the wall protective casing is cased off in the whole process in a pull-back mode, grouting solidification is conducted, and a drainage shock tube is mounted for filtering debris in water of the water outlet roadway. Therefore, the construction method of the precision perforation drainage holes in the coal mine underground roadways can effectively ensure that the drilling holes in the drainage roadway are perforated precisely and the large-diameter casing are cased off in the whole process, so that special drainage roadway excavation construction are replaced effectively, and cost of coal mine water treatment is greatly reduced.

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...

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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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