| 摘要 |
<p>A self drilling rock bolt comprising a hollow elongate member with a drilling tip on its leading end with a nut and a domed ball on the opposite end where the nut can be rotatably advanced along a threaded section on the elongate member and with a hollow female injection sleeve fixed to the elongate member such that it prevents the nut from being unscrewed from the bar. The injection sleeve acts as a nut stop such that the nut can be used to rotate the elongate member during the drilling cycle, and also enables an injection nozzle to be inserted inside the injection sleeve so that water, resin or cement grout can be pumped into the elongate member. The injection sleeve may also contain internal seals or seals to hydraulically seal against the injection nozzle and one or more valves to control or direct the flow of fluids being pumped into the injection sleeve. The injection sleeve may also contain one or more external monitoring devices that may be connected to internal instrumentation within the elongate member. The hollow elongate member may also contain a static mixer inside its central hole in order to mix multi-component fluids pumped through it. The current invention overcomes the above problems with existing self drilling rock bolts and provides a self drilling rock bolt suited to be automatically or semi-automatically installed with a machine.</p> |
