Rock bolting

Details Rock bolting Rock bolting

E - Fixed Constructions

21

D

E21D 20/02 (2006.01) E21D 21/00 (2006.01) F16B 13/04 (2006.01) F16B 13/14 (2006.01) F16B 31/02 (2006.01) F16B 37/00 (2006.01)

Patent

CA 2066990

ABSTRACT IMPROVEMENTS IN ROCK BOLTING A drive nut (3,7) for a rock bolt, incorporating a nut (7) with a crimped protrusion (9), and an insert (3). The protrusion is crimped to form a plurality of lips (8) adapted to retain insert (3) in the head of the nut (7), the crimping being effected by a pressing tool having a number of preferably square bars. By this crimping technique, the drive nut (3,7) can be fabricated in such a way that the breaking torque required to expel the insert (3) from the nut (7) can be limited to a predetermined range. RLf/1626h

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