Apparatus for the sectional cantilever construction of bridge girder

Abstract

There is disclosed apparatus for the sectional cantilever construction of bridge girder systems of reinforced or prestressed concrete having a superstructure comprising a closed box cross-section and superimposed laterally overhanging bridge decking, said apparatus comprising travel devices for abutting against an already finished part of the bridge superstructure at whose position fixed support members, e.g. hydraulic jacks are disposed during the concreting operation, longitudinal girders projecting in the concreting condition over the front end of said finished superstructure part and connected to said travel devices or fixed supports therefor; shuttering components, for a cantilever section, carried by said girders; and half-frames engaging laterally round said bridge deck and having means for supporting on said bridge deck; the apparatus being further characterized by said longitudinal girders being arranged laterally outside the shuttering for the side walls of the superstructure and being connected with outer shuttering made inherently rigid and self-supporting; by said half-frames being connected (in such a way as to be rigidly resistant to bending) to longitudinal girders substantially at the rearward ends of said shuttering; by said longitudinal girders being provided at the side opposite the part which is projecting and which carries said shuttering with devices for abutting against or supporting the underside of said laterally overhanging bridge deck. There is also disclosed an auxiliary structure for use with such apparatus.