Hollow bars and method of manufacture

Details Hollow bars and method of manufacture Hollow bars and method of manufacture

E - Fixed Constructions

21

D

E21D 21/00 (2006.01) B21B 1/16 (2006.01) B21C 37/06 (2006.01) B21C 37/08 (2006.01) B21C 37/10 (2006.01) B21H 8/00 (2006.01) B21K 5/02 (2006.01)

Patent

CA 2145522

A hollow bar (3) and a method of manufacturing the hollow bar are disclosed. Typically, the hollow bar is a threaded rock bolt or a drill rod. The hollow bar (3) comprises two or more elongate members (21a, 21b) connected together along the longitudi- nal edges (41) of the members (21a, 21b). The method comprises rolling the members (21a, 21b) and welding or gluing the mem- bers (21a, 21b) together along the longitudinal edges (41) of the members (21a, 21b).

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