YIELDING HEAD FOR MINE SUPPORT

摘要

A yielding head for reducing the need to recondition a rock mass. The yieldi ng head includes a mine hole cradle and a longitudinally movable bar therein. T he bar, which is connected to an extension bolt, is registered with a collapsible bubble serrated yielding element circumscribing the bar. As the rock mass is displaced the bar is dra wn into the mine hole. The yielding element absorbs the stress on the bar in a controlle d manner.