Incremental launching method for bridge

The present invention is installed by operating the reaction force device for supporting the reaction force acting when the upper structure is oscillating while advancing along the rail in the launch field for oscillating the bridge superstructure, and easily extrudes the superstructure even when the launch site is narrow The present invention relates to a bridge superstructure extrusion apparatus that enables a bridge to be constructed by a continuous extrusion method, and a continuous extrusion construction method for a bridge using the same. In the present invention and the rail (10) installed in the launch site; A support tower assembly 20 for extruding the upper structure of the bridge while moving along the rail 10; The bearing tower assembly 20 includes a platform portion 21, a tower portion 22, and a reaction force device 23; The reaction force device (23) comprises an expansion and contraction cylinder member (231) and a clamp (230) for engaging and releasing the rail (10); When extruding the bridge superstructure 200, the expansion and contraction of the cylindrical cylinder member 231 while the clamp member 230 is in engagement with the rail 10 moves the platform 21 and the tower 22 forward. After the bridge upper structure 200 is pushed forward, the clamp member 230 and the rail 10 are released, the expansion and contraction of the cylinder member 231 is performed, and the clamp member 230 moves forward. There is provided a bridge superstructure extrusion apparatus characterized by having a configuration that is fixed to the rail 10 again, and also provides a bridge continuous extrusion construction method for constructing a bridge using the same.