A New Solution for Fabrication & Erection of Composite Box Girder of Cable-Stayed Bridge

Quanzhou bay bridge is a sea-crossing approach which is located on the southeast coast of China near Quanzhou city. The main bridge is a cable-stayed bridge with steel-RC composite box girder and main span 400m. Unlike the traditional wet joints between RC decks of composite segments, a new solution with dry joints for fabrication and erection of composite girder segments was used in Quanzhou bay bridge. The steel box girder segments and RC decks were fabricated separately at first. The composite segments were assembled and the steel part and RC part were combined. Because of the dry joints, the composite segments must match with each other. The fabrication and assembling works are all done in the factory. Then the integral composite segments were transported to the bridge site and erected by deck crane. Segments were connected by temporary prestressed steel bars after the deck joints were daubed with epoxy glue. The joints at steel part of composite girder were welded finally. The new solution can omit concrete pouring and casting at the construction site and improve the efficiency and quality of composite segments erection. The impact on environment during construction procedure is also reduced.