Multi-layer Deep Hole Drilling Technology and Equipment for Broken Soft Coal Seam

In the gas control of soft large mining height coal seam, multi-layer drilling is used to cover the whole mining height, and at the same time, enough drilling depth must be ensured to meet the needs of gas drainage. In view of the requirements for drilling equipment in multi-layer deep hole construction of broken soft coal seam, a ZDY10000L high power multi-hole drilling rig is developed, which is equipped with a wide flanged helix drill pipe and a combined drill pipe with a horizontal drill pipe and a three-edged drill pipe, and a matching drilling technology for compressed air and exhaust stations. The field tests in Zhaozhuang Coal Mine 1308 working face shows that: the opening hole height range of combined luffing mechanism is 1.5 m to 3 m to meet the needs of multi-layer hole; automatic lifting device improves the efficiency and safety of multi-hole construction; the average hole depth by using this technology and equipment is more than 100 m, the hole rate is greater than 85%.