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一、问题的提出随着综采工作面的发展,回采巷道,特别是运输顺槽的断面不断加大,矿压显现愈加强烈。为了适应这些矿压现象,不少科研单位和生产厂家,先后设计和试制不同类型的巷道金属可缩性支架,其可缩接头通常是卡缆式的,通过卡缆对可缩件与固定件之间产生一定的摩擦阻力,摩擦阻力的大小是控制可缩量的主要依据。当前国内外多采用螺栓卡缆,这种形式的卡紧力常用力矩搬手来完成。但是,由于井下环境恶劣,螺栓容易生锈,往往不能拆卸造成回收困难,这是最大缺点。在西方一
First, the issue raised With the development of fully mechanized mining face, mining roadway, especially the transport section along the trough continue to increase, rock pressure appears more and more intense. In order to adapt to the phenomenon of underground pressure, many scientific research units and manufacturers have successively designed and trialled different types of tunnel metal retractable brackets. The retractable joints are usually of the cable type. The cables can be retracted and fixed A certain amount of friction between the friction resistance is the size of the main basis for controlling the amount of shrinkage. At present, more use of bolt-type cable at home and abroad, this form of clamping force torque torque commonly used to complete. However, due to the harsh underground environment, the bolts are prone to rust and often can not be disassembled to cause recovery difficulties, which is the biggest disadvantage. In the west one