| 摘要 |
A roof bolt comprises a shell with a cavity and depressions at the outer surface, channels for outflow of binding agent that are placed near one of the ends of the shell, pusher as a rod with piston thick end for interaction with binding agent at roof-bolt setting to the borehole and annular seal between the outer surface of the shell and the mouth of the borehole. The channels for outflow of binding agent are arranged as cuts at the end of the shell. Near the annular seal from the inner side of the borehole at the outer surface of the shell through openings are provided for outflow of binding agent at the completion of roof-bolt setting. |
