论文部分内容阅读
锚杆在美国各矿山普遍使用始于本世纪20年代,当时煤矿使用点锚固锚杆或机械式锚杆。50年代后期出现了树脂锚杆。70年代未,J.斯科特博士发明了缝管式锚杆。之后缝管式锚杆迅速获得普遍推广,尤其是在金属矿和铀矿。迄今煤矿仍广泛使用点锚固锚杆。这种锚杆应考虑的某些重要因素是:安装成本;锚杆装置的完整性(机械式锚杆能用力矩扳手检查);习惯势力的影响很大(新型锚杆很难得到批准);要为特种型式的锚杆设计专用设备(改装设备的费用高)。
Bolts commonly used in various mines in the United States began in the 1920s, when coal mines used anchor points or mechanical anchors. The late 50s appeared resin bolt. In the 1970s, Dr. Scott invented a seamed anchor. Suture bolts have since been rapidly gaining widespread popularity, especially in metal mines and uranium mines. To date, point anchoring bolts are still widely used in coal mines. Some important factors that should be considered for such anchors are: installation costs; integrity of the anchorage device (mechanical anchors can be checked with a torque wrench); habitual forces have a significant impact (new anchors are difficult to obtain); To special equipment for the design of special types of bolts (modified equipment costs high).