| 摘要 |
Section (1) for shoring of mines, consisting of two I sections, the inner flanges (2) of which are welded to one another. The box-like section obtained is provided, in its upper I-flange (3) and lower I-flange (4), with mounting recesses (5) for support-free fixing by means of rock anchor bolts. For this purpose the upper and lower mounting recesses (5) are arranged in alignment. |
