To carry out easy correspondence by one moving carry-in device, in which a plurality of trucks are arranged in parallel, and to conduct the carry-in works and connecting works of unit blocks for a bridge, etc., efficiently and safely even when the width of the bridge, etc., is changed at the time of the assembly, etc., of the bridge girder in a method of the rotational installation of the bridge.

In the moving carry-in device 12, a plurality of moving trucks 13, on which unit blocks 1-n for a bridge, etc., are placed, are arranged in parallel in response to the width of the unit blocks, each moving truck 13 is coupled by coupling devices 14, and the moving carry-in device can correspond to the various width of a bridge girder, etc. Rotational supporters 17 are installed onto each moving truck 13, the lower end sections of the unit blocks under a horizontally placed state are supported and the unit blocks can be erected by a crane, lifting-lowering frames 20 are mounted, and levels can be adjusted for connecting the unit blocks 1-n to the lower section of the beforehand assembled and lifted-up bridge girder.