| 摘要 |
A fibre reinforced rock dowel (10) for use in reinforcing strata or the like has a generally cylindrical shank (12) having a longitudinal axis and defines one or more groups of mixing vanes (16, 18, 20) projecting from the shank, and a threaded end (14) for the attachment of a nut (13). The dowel is reinforced by inner (21a) and outer (21b) filaments extending generally along the longitudinal axis. At least the outer filaments extend in a generally helical path through the dowel with outer filaments extending in a helical path in the opposite sense to the thread of the threaded end. The dowel is manufactured by a process in which continuous fibre filaments (7) are drawn through a resin filled bath (6) into a press (4) with fixed lower and movable upper heated dies so that when the press closes it moulds the shape of the dowel, in a process known as pulforming”, with the cured dowel attached to the filaments being rotated about its longitudinal axis to impart twist to the fibres in the dies (4a, 4b). |
