STEEL COMPOSITE PSC TRUSS U GIRDER SIMPLE BRIDGE AND CONTINOUS BRIDGE

摘要

The present invention relates to a simple bridge having a steel composite PSC truss U-girder comprising: a U-girder (40) which includes a concrete lower flange (10), a pair of concrete upper flanges (20), and a pair of truss webs (30); a concrete partition block (50) for an abutment point which connects the concrete lower flange (10), the concrete upper flanges (20), and the truss webs (30) to each other in both ends of the U-girder (40); a precast half deck (60) which is installed on the concrete upper flanges (20); first and second inner PS steel wires (W1, W2) which are installed inside the concrete lower flange (10); first and second outer PS steel wires (W3, W4) which are installed on the inner space of the U-girder (40); a pair of fixing blocks and fixing parts (71a, 71b) for the first and second inner PS steel wires, which fix the first and second inner PS steel wires (W1, W2), respectively; and a pair of fixing blocks and fixing parts (73a, 73b) for the first and second outer PS steel wires, which fix the first and second outer PS steel wires (W3, W4), respectively. Therefore, the present invention improves efficiency by improving the structure and tension method of a truss connection point, the fixing blocks, the fixing parts, a saddle shape, and the PC steel wires compared with a conventional steel composite PSC truss U-girder, and reduces the weight of the girder by reducing the amount of used concrete compared with a conventional PSC U-girder.