Demountable bridge for instance floating bridge or canal bridge

摘要

876,933. Bridges. BETEILIGUNGS-UND PATENTVERWALTUNGSGESELLSCHAFT. May 22, 1959 [May 24, 1958; March 2, 1959], No. 17557/59. Class 20(1) A demountable floating or canal bridge comprises girders 2, Fig. 5, having side walls 6, 7 and joined end-to-end by joint bars 10 of H shape in plan, the oppositely extending pairs of legs of the joint bars embracing the ends of the girders and being detachably connected to the side walls 6, 7 of the girders to provide joints resistant to bending. In Fig. 6, each girder is provided with a pair of transversely extending cylindrical locking members 15, 17, of which the member 17 is arranged to be held against a pad 27 by one hook of a double hooked bolt 28, both the pad and bolt being carried by the joint bar 10. The locking members 15 each comprises a pair of colinear bolts adapted to be forced apart against spring pressure by the pointed lower end of a screw 21 when this is screwed downwardly, thereby engaging outer ends of the locking bolts within eyes 23 at the ends of the joint bar 10. Figs. 11-14, (not shown) illustrate a joint bar comprising too adjustably hinged parts each part being secured to a girder, such joint bar being used at the junction between the bridge and its ramps. In another embodiment, Figs. 21-24 (not shown), the girders are each provided with a pair of locking members similar to the members 15 and each comprising a pair of colinear bolts adapted to be forced apart to engage eyes in the joint bar by a slotted cam actuated from the top of the girders.