| 摘要 |
<p>An anchor bolt 1, which is formed by a drill intended permanently and substantially wholly to remain in a drilling immediately after that drilling has been made, is provided with a cutting head 2 at one end portion thereof and is basically of non-circular cross-sectional shape for at least the major part of its length. The bolt may be further provided with a longitudinal passage 7 which is suitably in communication with orifice means 10, 11 disposed in the bolt adjacent the cutting edges 4, 5 of the head, for the introduction of a settable substance. <IMAGE></p> |
