Rock bolt

A rock bolt comprising:

• an elongate, circular tube, the tube having a leading end and a trailing end;
• an expander mechanism disposed within the tube in a region of the leading end;
• and
• an elongate bar or cable disposed longitudinally within the tube and in connection at or towards a first end of the bar or cable with the expander mechanism and in connection at or towards a second and opposite end of the bar or cable with an anchor arrangement positioned at the trailing end of the tube, the elongate bar or cable being actuatable to actuate the expander mechanism and to remain connected between the expander mechanism and the anchor arrangement when the expander mechanism is actuated, wherein the tube has at least one displaceable wall section in the region of the leading end the displaceable wall section having a hinge end proximal to the leading end connecting the at least one displaceable wall section to the tube, and side walls extending from the hinge end to an anchor end distal to the leading end the expander mechanism being actuatable to displace the at least one displaceable wall section to rotate about the hinge end to shift the anchor end outwardly from the tube.