A reinforcement bar to be embedded in a concrete structure includes a rod segment, a self-tapping segment, and a head. The rod segment defines a central axis. The self-tapping segment extends integrally from one end of the rod segment along the central axis. The head extends integrally from the other end of the rod segment along the central axis, and is operable manually to rotate about the central axis so as to drive the self-tapping segment to drill into the concrete structure.

The invention provides an adaptor for connecting a drill bit to a hollow shank of a self-drilling rock bolt, the adaptor including a body which extends in an axial direction between a distal end and a proximal end, a tubular conduit which extends between the ends, an abutment surface formed in an outer surface of the body that divides the body into a proximal portion and a distal portion, wherein at least a part of the proximal portion includes a first taper which tapers towards the proximal end, wherein at least a part of the distal portion includes a second taper which tapers towards the distal end, and wherein the first taper and the second taper are adapted for friction fit in a bore of the shank and a recess in the drill bit respectively.

The present disclosure provides a system to optimally set an anchor and a bullet within a pre-drilled bore hole. The anchor is comprised of at least two spreading lamellae, the spreading lamellae having a cutter to cut through cementitious material in the bore hole. The cutter comprises a tapered face to minimize contact with a bullet. In turn, the bullet is comprised of a radial flange to act as a stop for the spreading lamellae so that the anchor does not over drill deeper in the pre-drilled bore hole.

A rock bolt dolly for connecting a self-drilling rock bolt to a rock bolting apparatus includes a drive shaft having a central bore and defining a proximal end and a distal end defining an engagement means for engagement with a corresponding engagement means located on the proximal end of the rock bolt. A sleeve is mounted over the distal end of the drive shaft and arranged to slide along and over the drive shaft and defines a female engagement means at a distal end, for engaging with a nut threaded onto the proximal end of the rock bolt. The interior of the sleeve and exterior of the drive shaft are configured to rotate together about their central axis. A spring biases the distal end of the sleeve away from the distal end of the drive shaft. The dolly operates in two modes, one in which the nut and rod rotate together, and a second where the nut rotates on the rod.

A rock bolt dolly for connecting a self-drilling rock bolt to a rock bolting apparatus includes a drive shaft having a central bore and defining a proximal end and a distal end defining an engagement means for engagement with a corresponding engagement means located on the proximal end of the rock bolt. A sleeve is mounted over the distal end of the drive shaft and arranged to slide along and over the drive shaft and defines a female engagement means at a distal end, for engaging with a nut threaded onto the proximal end of the rock bolt. The interior of the sleeve and exterior of the drive shaft are configured to rotate together about their central axis. A spring biases the distal end of the sleeve away from the distal end of the drive shaft. The dolly operates in two modes, one in which the nut and rod rotate together, and a second where the nut rotates on the rod.

An injection system for a self-drilling rock bolt assembly (1), the system including: a receptacle (2) to be fixed in use to a drill head (4) of the self-drilling rock bolt assembly (1), the receptacle (2) having a nozzle receiving end (5) and an opening (6) at the other; a replaceable canister (7) to be located within said receptacle (2) in use, said canister (7) adapted to supply two or more substances for use in installing the rock bolt assembly (1) through said nozzle receiving end (5); and a plunger system (8) operatively associated with said receptacle (2) adjacent said opening (6) at said other end and positioned along a longitudinal axis (XX) of the drill head (4); the plunger system (8) including two or more plungers (9) that are activated in use to drive the substances within the canister (7) when located within the receptacle (2), delivering the substances by way of a nozzle (21) mounted to the nozzle receiving end (5) into the self-drilling rock bolt assembly (1).

The invention provides a displacement measuring device which includes an elongate rigid body which extends between a proximal end and a distal end and which is adapted for insertion in a rock hole, the body including a first member and a second member, a proximal anchor engaged with the first member and positioned and adapted to engage the rock hole at a proximal location, a distal anchor engaged with the second member and positioned and adapted to engage the rock hole at a distal location, and a displacement sensor, wherein the first member is adapted to move axially relatively to the second member when the proximal location moves away from the distal location, as a result of a displacement, and wherein the displacement sensor is responsive to movement of the first member relatively to the second member and which is adapted to generate a first output which is indicative of the extent of the displacement.