Apparatus for concreting multiple section structures, particularly bridge supports of reinforced or prestressed concrete

Claim 1

Apparatus for concreting multiple-section structures, particularly elevated highway and bridge structures of reinforced or prestressed concrete, said apparatus comprising two girders that are displaceable relative to one another, one said girder being an advancing girder and the other said girder being a scaffold girder supported on said advancing girder during advancing operations, each of said girders being substantially of a length corresponding to a section of the structure being built and both being located together in the same section of the structure and jointly carrying the load during the concrete pouring and hardening stage, and load distributing means intermediate said girders distributing the load therebetween, said load distributing means being releasable to permit movement of the girders separately to a new section of the structure and retaining said scaffold girder during construction operations above said advancing girder; and supporting frame means operative during the advancing stage to support said scaffold girder on the roadway and to support said advancing girder movably on said scaffold girder, jack means operative to support said advancing girder in a new position at its rearward end on the roadway and at its forward end over a succeeding column in a series, girder support means for supporting said scaffold girder on the rearward end of said advancing girder and means including a support having rollers provided at the rearward end of said scaffold girder operative to ride on the roadway while moving said scaffold girder into position above said advancing girder.