The rebar bolt consists of a main body with a series of longitudinal grooves (corrugations) that increase its anchorage capacity in the surrounding rock. They have the inner end cut at 45º to facilitate their insertion and the outer threaded end to tension the bolt and the plate by means of a nut, which can either be hexagonal or round.
To install a rebar bolt, a hole is drilled in the rock with a diameter greater than the diameter of the bolt and the hole is filled with cement mortar or resin. The bolt is immediately inserted, turning it to react the resin catalyst and it begins to harden, generating tension. Once inserted and the grout or resin have already generated consistency, the anchor plate is tightened with the nut, thus putting the bolt under load and fixing it firmly.
Once the bolt is firmly set in the rock, it can be used to support wire mesh, steel plates or netting to provide additional stability to the ground.
Rebar bolts are commonly used in mining and tunneling to prevent ground instability, which can jeopardize worker safety and damage underground excavation infrastructure.