The latest constructing machine and the newest technology were adopted to ensure that the borehole is perpendicular to the rock face of roof and that the depth of borehole and the torsional moment of the anchoring bolt meet the design requirement.

• 采用最新锚杆施工机具及工艺，保证钻孔垂直于顶板岩面，孔深及锚杆扭矩满足新型机械锚杆的设计要求。