Method for launching/constructing bridge using assembly of precast bottom plate and concrete-filled steel tube truss girder

A launching method of a bridge, which constructs a bridge to have a superstructure composed of a concrete filled steel tube (CFT) truss girder and a precast concrete slab, the launching method comprising:

• placing a precast concrete slab on a CFT truss girder at a casting bed to fabricate a segment including the CFT truss girder and the precast concrete slab in a temporarily assembled state, successively disposing segments to connect CFT truss girders integrally with each other, and launching the segments in order in a front direction to form a superstructure of a bridge;
• and
• integrally composing the CFT truss girders and the precast concrete slabs after the segments are completely launched.