In addition to the use of chemical anchoring material to obtain the pre-stressing of rock bolt, the mechanical expansion shell with easier installation and high performance of anchor loading is also one of the bolting solutions on site. In particular, if water mergers after bore holing of rock bolt, an expansion shell can be attached onto a full-threaded rock bolt, which is then placed at the required depth of borehole and rotated by a drill machine or hand-held hammer in order to obtain immediate loading capacity for anchoring.
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