Sinorock self drilling anchor hollow bar is a kind of hollow bar with fully threaded,which can be cut and coupled as required by couplings,and the disposable drill bit is installed in the output end of the rock anchor.
Since the special structure of self drilling hollow bar,it has a large quantity of advantages  in the following:
1.Great efficiency:self drilling hollow bar offers a single action of drilling,grouting,anchoring in an operation and every construction procedure can be done in one-step operation,which prevent the loss of time-consuming and multi-step construction effectively.
2.Be applicable to the ground condition that it's hard to drill a hole:as you know that it is extremely difficult to drill borehole in the loose,broken rock, and if possible,collapse is aften occur after drilling into another anchor with a great deal of trouble.However,the self drilling hollow bar technology can avoid the insufficiency of conventional drilling methods.After drilling,anchor bolt will be kept within the borehole, so collapse will not happen.In this way,construction time can be extensively saved and the difficulity of construction can also be greatly reduced.
3.Wonderful suitability:fully threaded,the self drilling hollow bar can be coupled and cut at any point to suit various kinds of geological conditions.