Patent ID: 7377724

Claim:
Method for installing, in a rock wall or roof, a self-drilling expandable rock bolt ( 2 ) having a drill bit portion ( 5 ), an expansion portion ( 9 ) and a connecting portion ( 10 ), providing, in a rock breaking step, the self-drilling rock bolt ( 2 ) with a rock breaking movement and flushing fluid for producing a bore hole, and introducing, in an expansion step, pressurized expansion fluid into the expansion portion ( 9 ) in order to expand it so as to be fixed to the inside of the bore hole, characterized in introducing the expansion fluid by means of a swiveling device ( 6 ), which is arranged to co-operate with an outward surface ( 36 ) at the region of the connecting portion ( 10 ) during installation of the rock bolt, so that, in an inactive state of the swiveling device, the rock bolt ( 2 ) is free to move during the rock breaking step, and in an active state of the swiveling device, tightening it against the rock bolt ( 2 ) in the expansion step in such a way that a sealed channel for expansion fluid is established between an expansion fluid source and the expansion portion ( 9 ).