| 摘要 |
PROBLEM TO BE SOLVED: To provide a construction method for box girder bridge that can shorten a construction period by reducing the workload at the construction site of a bridge.SOLUTION: A box girder of one span is halved in an axial direction substantially at the center in a width direction so as to manufacture two precast girders 11, 12 which are asymmetrical in a right-left direction and sectioned such that there is an opening between an upper floor slab and a lower floor slab of one side part. A tendon 14 is arranged nearby a side edge where those precast girders are joined together so that when the precast girders are supported at both end parts, an upward reaction component operates on nearby the side edge from the tendon 14 nearby the center in the axial direction. Further, prestress is introduced nearby a tip of a projection part 5a of the upper floor slab and nearby a joint part between a web 6 and the lower floor slab 7. Such two precast girders are suspended between parts of bridge girders, formed on bridge piers, above the bridge piers respectively, and concrete is cast between the two precast girders and the two precast girders and the parts above the bridge piers so as to construct a united box girder. |
