Baker International Inc.

William S Price

Timothy W Saunders

A single-pass roof bolt adapted to drill and to be secured in a bore in the roof of a mine for supporting the roof comprising a tubular body open at one end thereof, constituting the inner end of the bolt, and a cutting structure at the opposite end of the tubular body, constituting the outer end of the bolt. The bolt is adapted to drill a bore in the mine roof upon rotation of the bolt, with the cutting structure being wider than the tubular body for forming an annulus between the tubular body and the wall of the bore. The bolt has a head at its inner end to facilitate rotation of the bolt, and to bear against the mine proof in pressurized relationship. The tubular body further has a transfer port at its outer end, and is free of flow obstructions between its ends, whereby during drilling air is flowable through the bolt for removing cuttings from the bore, and upon completion of drilling grouting material from a source external to the roof bolt may be delivered to the annulus via the transfer port for securing the bolt in the bore. A roof bolting system including a machine for rotating, applying force and delivering the grouting material to the bolt to install it is also disclosed. In addition, a method of installing the bolt is disclosed.

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Irving, TX, United States of America

William S Price