| 摘要 |
PROBLEM TO BE SOLVED: To provide a direction correcting method capable of correcting a launching direction while launching bridge girders without interrupting the bridge girder launching work. SOLUTION: Plural launching devices B are provided on a bridge pier C, and a bridge girder A is placed on the launching devices B, and a rear part of the bridge girder A is pushed or a front part of the bridge girder is pulled so as to transfer the bridge girder A onto the launching device B on the bridge pier positioned in front in the bridge axial direction. In this launching erection, plural launching devices B provided in parallel with each other on the bridge pier C for supporting cross direction of the bridge girder A to be fed are coordinately moved in the same direction at the same time so as to correct a displacement in the launching direction while launching the bridge girder.
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