In addition to the address of factors, primarily anchoring force bolting system deficiencies caused. After the roadway into the lane, in the original rock gravity and secondary stress (including mining and other kinds of support pressure caused by) the role of the side opening bolt cutter, roadway deformation, if the rock is not self-stabilizing, and bolting inadequate anchoring force system, this deformation is not effectively controlled bolt cutter, will continue to develop, eventually leading to surrounding rock caving and roof collapse. Between anchor row spacing is too large, improper bolting material selection, matching bolting system is unreasonable, and poor quality of construction will have the consequences. Bolt Notes A, drilling, drilling joints should be perpendicular to the rock face, rock bolt axis of the main structure should slip plane surface or into larger angle. Shall not be applied mechanically radial bolt, and should be adjusted depending on site conditions. B, chemistry kits when plugging into, make sure to plug tight, so as not to end chemical slurry spill caused by anchoring anchor segment untrue. C, chemistry kits in the anchoring of time, we must maintain a solid anchor, not shaking, rotating to ensure anchoring quality. D, at the plate, such as orifice injustice, should be used mortar smooth handling. E, without the anchor bolt bolt cutter before the two-way, its self-important, should be prevented from slipping wounding anchor bolt torque multiplier is the solution to help (top) the best equipment early enough anchor bolt force. Alone 35 (120) when the rig tightened bolt nut torque can only reach 35 (120) Nm, the beginning of the anchor bolt force only 10 (35) KN about a serious shortage of early anchor force. To improve the initial anchor force, the general increase in the use of a torque wrench torque MGQ-26 type bolt cutter type opening, increase early anchor force, time-consuming and laborious. After using the rig and increase torque converter installation linkage nut torque can be increased 5-6 times, so that the bolt preload for 70 ~ 90 (120 ~ 160) KN, fully meet the anchor bolt in the beginning of the design requirements. Tai'an City, Warner Mechanical and Electrical Equipment Co., bolt torque multiplier (by the torque converter) into ZN-I type (for help anchor) and ZN-II type (for the top anchor) two specifications. Fuxin bolt cutter provided by Warner electromechanical. This information consists of: Mechanical and Electrical Equipment Co., Ltd. Tai'an City Warner (www.tahnjd.com) offer, we are Commercial Union membership, the integrity of the whole network certification vendor. Feel free to contact us, Contact: Lee