Construction method for divisiontension type represtressed preflex composite bridge by steel I-type girder having uniform section

摘要

PURPOSE: A construction method for a split extension type re-prestressed preflex composite bridge by a steel I-girder of a uniform section is provided to extend the life of a structure stably by improving fatigue resistance of a bridge structure. CONSTITUTION: The construction method for a split extension type re-prestressed preflex composite bridge by a steel I-girder of a uniform section comprises the steps of manufacturing an upper flange(7a) and a lower flange(7c) of a steel I-girder(7), which is a frame of a preflex composite beam or a re-preflex composite beam(10) composed of a steel I-girder(7), reinforced concrete(4) and a PC strand(5), along the whole length of a beam(10) with a sheet of a steel plate, then spitting into three parts, and joining a joint of each part with each joint plate(700a,700b,700c) mechanically using bolts(9) without welding not to cause residual stress caused by welding. As for compounding the steel I-girder(7), the lower flange concrete(4) and the PC strand(5), the intermediate of the PC strand(5) is located in the section of the lower flange concrete(4) partially and both ends of the PC strand(5) pass through the section of web concrete to be tensioned/anchored after placing a slab and web concrete.