| 摘要 |
A tensioned truss system for supporting a face of a passage in a geological structure, such as a mine roof. Spaced anchors extending into the geological structure support corresponding truss transition brackets positioned adjacent the roof. The proximal end of each of the anchors is connected to the respective brackets so as to provide support and dual elongated truss members are attached to and span between the brackets for assisting in the support. The truss members are tensioned together through a driver mechanism carried by a drill head on a roof bolter machine. The driver mechanism includes a detachable drive adapter assembly having a pair of deep well or through sockets that engage rotary fasteners threaded onto one end of the truss members to apply the tension. Prior to tensioning, split wedge retainers are used to fix the other unthreaded end of the truss members. The brackets are interchangeable and include a frusto-conical bore for receiving the retainer, or which is spanned by a washer on the fastener. The drive adapter assembly is detachable from the drill head, and includes a flexible coupling and a worm gear to drive integral side by side pinion gears and deep well or through sockets for tensioning the fasteners. A color code is provided on one truss member to designate the required opposite hand thread./!
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