SOLVING PROBLEMS OF JOINTS IN PRECAST CONCRETE BRIDGE CONSTRUCTION. TESTING OF "REINFORCED CONCRETE SPRING PLATE"

LOESUNG VON FUGENPROBLEMEN BEIM BETONFERTIGTEIL-BRUECKENBAU. HIER: PRUEFUNG EINER "STAHLBETONFEDERPLATTE"

THE ELBMARSCH ELEVATED ROAD CONSISTS OF BLOCKED SERIES OF STATICALLY DETERMINATE SUPERSTRUCTURE SPANS MADE OF PRECAST, PRESTRESSED CONCRETE. EVERY THREE SPANS HAVE TO BE LINKED ELASTICALLY BY MEANS OF REINFORCED CONCRETE SPRING PLATES. THE ENDS WHICH HAVE TO BE LINKED ARE SUBJECT TO VERTICAL MOVEMENTS CAUSED BY TRAFFIC LOADS AND OTHER EXTERNAL FORCES, AND ALSO TO ANGULAR ROTATIONS. THE SPRING PLATES, WITHOUT LOSING THEIR BEARING CAPACITY, HAVE TO BE ABLE TO ABSORB THE STRESSES CAUSED BY THESE MOVEMENTS OF THE SUPERSTRUCTURE AND ALSO THOSE RESULTING FROM DIRECT LOADING BY VEHICLES. MOREOVER THE WIDTHS OF THE CRACKS IN THE SPRING PLATES HAVE TO BE SUFFICIENTLY SMALL SO THAT THE GUSSASPHALT SURFACING CAN BE LAID OVER THEM WITHOUT JOINTS. AT THE MATERIALS TESTING INSTITUTE AT STUTTGART A TEST PLATE IS BEING SUBJECTED TO A LARGE NUMBER OF ALTERNATE LOADS, AND THE LOAD-CARRYING BEHAVIOUR IS BEING OBSERVED AND DETERMINED BY MEASUREMENTS.