| 摘要 |
<p>Inventor: GUSTAV SIGFRID ANDERSON Title: METHOD OF SECURING A ROCK BOLT: When securing a rock bolt in a drilled hole in the rock the bolt having a conical end, is inserted to the desired depth in the hole. A gun, charged with a sleeve, is applied on the outer end of the rock bolt, and the bolt is centered in the gun barrel. The sleeve is shot into the hole at a high speed to be wedged in the gap between the conical end of the bolt and the wall of the hole.</p> |
