| 摘要 |
The invention relates to a rock bolt (1A) comprising a pipe (12) with a cap (20) welded in sealing engagement over an open end of the pipe (12). The cap (20) has a substantially cylindrical skirt (22) welded to the end of the pipe (12) in a pre-formed tabular condition. The cap (20) also includes a substantially domed cover section with an end portion that is elongate along a line (y) that is transverse to a folding line (x) about which a channel (115) is formed along a length of the pipe (12) and through the cap (20). The invention extends to associated methods of forming a rock bolt (1A). |
