Study on New Type Borehole Sealing Device and Process for Coal Mine Underground

The gas pressure of coal seam is an important parameter to make effective and reasonable measures for preventing and controlling gas, and risks of coal and gas outburst. Gas drainage is the fundamental measure to prevent and control the gas disaster accident．Superior borehole sealing as the core process of gas pressure measurement and gas treatment technology is very important. Through the analysis of current borehole sealing techniques, we proposed the "low-pressure doing plugs and high-pressure plugging fissure" method for leaking stoppage, which would be a two sealing and one grouting sealing technique formed with a grouting between two sealing ends. The new type borehole sealing device and technology has characteristics of simple operator, low labor intensity, and superior sealing quality, which can be widely used in the hole sealing of engineering hole.