Improvement and Application Technology of Long Bedding Borehole Rig in Rockburst Seam at Headentry and Tailentry

Advantages, disadvantages, and drilling adaptability of several rigs earlier used in domestic coal mine are analyzed. CMS1-800/30 crawler jumbo is reconstructed from standing pillar rig according to specific condition of long bedding borehole at coal face which possesses rockburst trend. Wide blade spiral drill pipe and Φ65mm diamond compact bit are used to drill long bedding borehole at headentry and tailentry. Drilling efficiency of long bedding borehole is greatly improved, and effect of relieving stress is very good. Safe and quick mining is ensured, and economic benefit is remarkable.