| 摘要 |
A movable scaffold supporting device, for engaging the lower portion of a concrete girder or an I-beam type girder, including an elongated tubular member, an adjustable flange engaging arm mounted to the tubular member, an L-shaped head member, a spring loaded locking device which positively locks the head member against an I-beam or concrete girder, and a supplementary locking device. Further, the device includes rollers located beneath the bridge.
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