US 3,985,480 AGranted

Apparatus for the sectional cantilever construction of bridge girder systems

AssigneeDyckerhoff & Widmann Aktiengesellschaft

InventorKlemens Finsterwalder

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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.

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 superposed laterally overhanging bridge deckings, said apparatus comprising

travel devices comprising a laterally spaced pair of wheel means operating on the upper surface of an already finished part of the bridge superstructure,
a pair of similarly constructed longitudinal girders extending on opposite sides of the superstructure below the level of the laterally overhanging bridge deckings,
a pair of half-frames extending around opposite sides of the overhanging bridge deckings and each connecting that travel device on its side of the superstructure to the longitudinal girder on its side in a region intermediate the length of the girder to carry said girders in suspended position and thereby define front portions of said girders which may be projected beyond the finished part of the superstructure and rear sides of the girders extending underneath the overhanging bridge deckings of the finished part of the bridge,
jack means on the rear sides of said girders positioned to press against the undersurface of the overhanging deckings of the finished part of the superstructure,
jack means associated with said wheel means of the travel devices positioned to abut against the upper surface of the finished part of the superstructure whereby to inactivate said wheel means,
said jack means on the rear sides of said girders being adapted to cooperate with the jack means associated with the wheel means to fix the position of and support the apparatus,
shuttering means adapted to shape at least a part of the bottom portion of said superstructure, said shuttering means comprising reinforcing means applied to the outer surfaces thereof,
said shuttering means being connected to the front portion of said girders through the reinforcements, whereby during concreting, the shuttering means is supported from the longitudinal girders and said girders are supported by said jacks from the completed superstructure of the bridge.

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Abstract

Claims16