目前,包括安装在内,一根锚杆的总成本在20美元以上,如需重新安装或修理还要翻一番,而锚杆安装质量事故损失的时间大约占伤亡事故总时间损失的30％。因此,要求矿山尽可能安装优质锚杆是合理的。市场上出售的每一种锚杆,包括张紧的、不张紧的、全面接触的或点锚固的在 At present, including the installation, the total cost of a bolt is more than 20 U.S. dollars and it needs to be doubled again if it needs to be reinstalled or repaired. However, the time it takes for the bolt quality accident to be lost is about 30% of the total time loss of the casualty %. Therefore, it is reasonable to require the mine to install a good quality anchor as much as possible. Each of the commercially available anchors, including tensioned, non-tensioned, fully-contacted or point-anchored