| 摘要 |
A metallic cage for use in reinforcing concrete comprises a number of straight parallel bars and a wire helically wound around the bars and welded to the bars at the points of contact. The cage is made on an apparatus comprising a drive unit for propelling forward the parallel bars, a wiring unit for wrapping the bars with wire, and a welding unit for welding the wire to the bars where they cross. The wiring unit suitably comprises a circular frame surrounding the bars and carrying a spool, which is braked to keep the wire taut. The welding unit can include resistance weld guns movable with the cage.
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