ROCK BOLT ASSEMBLY COMPRISING A SENSOR ASSEMBLY

A sensor assembly for a rock bolt, wherein the rock bolt comprises a central rod, a split tube for being fitted around the central rod, a wedge anchor assembly fitted to the central rod, a rock plate with a hole, and a nut for attachment to an outer end of the central rod, wherein the sensor assembly comprises: a distance sensor, a bracket for attaching the distance sensor to an outer portion of the split tube, an elongate spacing member configured to be fitted around the split tube between the nut and the rock plate to keep the nut and the rock plate spaced apart, wherein the spacing member comprises an opening extending along at least a portion of the length of the spacing member, wherein the opening is sized large enough to allow movement of the bracket along a portion of the length of the spacing member with the distance sensor attached to the outer portion of the split tube by the bracket.