Resin-grouted rock bolt assembly with an adapted sealing bush

A rock bolt assembly which includes a rock bolt with an elongate body which extends between a distal end and a proximal end, a tubular sleeve which longitudinally extends between a leading end and a trailing end, on the rock bolt such that at least the proximal end of the bolt projects from the trailing end of the sleeve, and a nozzle docking bush which includes a cylindrical body defined between a first end and a second end, which has a recess in the first end of the body that is adapted to locate around the proximal end of the rock bolt and to sealingly engage the trailing end of the sleeve, which has a pair of spaced apart annular ridges, on an outer surface of the body between which a grout distributing channel is defined, and which has an aperture in the channel which opens the channel to the recess, wherein the grout distributing channel, the aperture, the hole, and an interior of the sleeve define a grout passage, and wherein when a nozzle of a grout delivery system engages with the bush, each annular ridge is adapted to seal against the nozzle to communicate a grout inlet port of the nozzle with the grout passage.