| 摘要 |
<p>The invention relates to a rock bolt to be installed into a borehole (1) drilled in a rock, wherein an expansion member (9) of the rock bolt includes an internal second cone abutment surface (12) in the interior of the expansion member in the vicinity of a second end (10) thereof. A second cone member (13) is at least partially fitted in the interior of the second end (10) of the expansion member (8). The second cone member includes a hole (14), through which a drawbar (2) is adapted to extend with a clearance, and a second cone surface (15) tapering inward relative to the expansion member and abutting against the second cone abutment surface (12) of the expansion member. A first end (17) of an elongated pushing member (16) bears on tightening members (5) and a second end (18) bears against the second cone member (13) on the opposite side relative to the expansion member (8) so that, as the drawbar (2) is tightened by the tightening members (5), the pushing member simultaneously pushes the second cone member (13) to the interior of the expansion member (8) for expanding the expansion member and engaging the expansion member to the wall of the borehole.</p> |
