关键词: 大直径钻孔, 瓦斯治理, 横川埋管, 上隅角

Abstract: This paper aimed at the large quantity and long period of crossheading buried pipe in WangPo coal mine, During the mining period, the maintenance cost of crossheading airtight wall is high, And serious gas overrun in the upper corner. This paper puts forward the large diameter borehole in coal seam gas control technology, The drilling parameter design, drilling, pipe laying, hole sealing, pipeline connection, pumping and other technological processes are introduced in detail. the test is carried out in 3310 working face, The results show that the gas in the upper corner is controlled between 0.19% - 0.61%, Gas extraction concentration increased by 1.2 times, The average concentration of drainage branch pipe is 6.85%, the pure gas extraction volume is 10.27m3/min, The construction period will be reduced by 23.53%,The number of employees decreased by 30.57%, The large diameter borehole in coal seam gas control technology, The process is simple, the pore forming speed is fast and the efficiency is high, The problem of gas overrun in the upper corner is effectively solved, It can be used for reference in gas comprehensive control of working face during mining.