| 摘要 |
<p>FRICTION ROCK STABILIZERS Friction rock stabilizers for anchoring a structure such as a roof or side wall of a mine shaft or other undergound opening, comprising a generally annular body having longitudinally extending edge portions which overlap one another circumferentially of the body and are relatively movable to permit substantial circumferential compression of the body. The body is circumferentially compressed for installation in a bore of diameter substantially smaller than the normal maximum outer diameter of the body whereby, after such installation, the resilience of the body causes the body outer circumference to anchor by frictional engagement with the surrounding wall of the bore.</p> |
