| 摘要 |
In the present invention, there is disclosed a self-boring hydraulically expandable rock bolt formed by a tubular body (1), the cross section of which has a distorted form, and to the upper section of which, there is attached a boring crown (3) provided with a cutting edge member (31) and to the lower section of which, there is attached a filling neck (5), wherein a screw sleeve (2) covering the body (1´) upper section and being provided in its lower section with peripherally distributed slits (21) extending parallel to the body (1) longitudinal axis, is fastened in undetachable manner to the body (1) upper face. In the boring crown (3), there is performed a closing valve (32) provided with at least one discharge channel (312) and the filling neck (5) external surface is adapted to detachable connection of a boring head (6). |
