Resin injection dolly

A method of using a dolly to install a self-drilling rock bolt in strata and/or rock, the self drilling rock bolt including a elongate hollow rod defining at least one externally threaded end, the method using the dolly to transfer percussive energy applied to the dolly by the rock bolting apparatus to the rock bolt during installation of the rock bolt in strata and rock, wherein the dolly comprises:

• coupling means coupling the dolly to the output shaft of the rock bolting apparatus;
• a percussion plate comprising an end plate and integral side walls defining an internally threaded recess for receiving the threaded end of the rock bolt, for applying percussive loading to the elongate hollow rod of the rock bolt via the end plate and threaded side walls;
• a body portion extending between the coupling means and the percussion plate transmitting forces from the output shaft to the percussion plate;
• wherein
• the body portion defines a first passageway having a diameter of for the passage of resin through the rock bolt dolly and into the rock bolt, and a second passageway for the passage of catalyst through the rock bolt dolly and into the rock bolt, wherein the diameter of the first passageway is at least about 10 mm, the method including the steps of:
• drilling a borehole in strata and/or rock using the self-drilling rock bolt connected to the rock bolting apparatus via the dolly;
• while the self-drilling rock bolt remains in the borehole, injecting resin into the borehole and rock bolt via the first passage passageway in the dolly and injecting catalyst into the borehole and rock bolt via the second passage passageway in the dolly wherein the resin comprises a polyester resin having a viscosity of from 100,000 to 400,000 centipoise;
• and
• disconnecting the self-drilling rock bolt from the dolly.