| 摘要 |
PROBLEM TO BE SOLVED: To easily install a scaffold for building work of a new bridge girder when a rebuilding construction of an overpass or the like in an overhead crossing of a road or the like is performed without blocking traffic of the road on a lower side thereof.SOLUTION: On an upper side of an existent bridge girder 1, a new bridge girder 10 is assembled while mounting end portions to respective auxiliary members 12 placed on a support 11 in a freely removable manner. Loading equipment 13 is mounted to the new bridge girder 10, the existent bridge girder 1 is suspended, carried out in a bridge axial direction and removed. A scaffold structure 20 which is moved while being guided by a rail 16 installed in the new bridge girder 10 for guiding the loading equipment 13 is linked to rear end portions of the existent bridge girder 1 in a direction of travel. When the existent bridge girder 1 is moved, the scaffold structure 20 is drawn out and installed on a lower side of the new bridge girder 10. |
