Patent ID: 6793445
Filing Date: 2004-09-21
Classification: E21D

Abstract:
A drill head capable of attachment to a drilling machine for insertion of rock bolts into rock strata; the drill head comprising;a base block including means to facilitate attachment to said drilling machine; drive means for rotating a spindle having a member at one end which receives a proximal end of a unitary rock bolt including an internal cavity; wherein the bolt rotates in conjunction with the spindle; an injection assembly including a plurality of internal passages for retaining and delivering to the rock bolt individual materials of a grouting compound, the drill head further comprising passages through which a flushing fluid flows and which are in fluid communication with said internal cavity of said rock bolt; wherein, said internal cavity in the rock bolt is in communication with the internal passages of the injection assembly so that when the proximal end of the rock bolt is inserted in the spindle, said injection assembly operates to inject from said internal passages in said injection assembly a predetermined quantity of said individual materials of a grouting compound into a bolt cavity in said rock strata via said internal cavity of said bolt and via a distal end of the bolt.