| 摘要 |
<p>1. An anchoring bolt to be anchored in a hole, having a screw for screwing up the bolt tight, said screw having a threaded part and a coned head part becoming thicker in a direction away from the threaded part, and furthermore a sleeve with a female-threaded hole next to an anchoring part able to undergo expansion in sectors, characterized in that the sleeve (10) has a many sided cross-section and in the middles of such sides has bursting lines (22) which are of decreased strength and are parallel to the anchoring bolt's axis.</p> |
