Construction Techniques for Steel-Concrete Composite Girder of Yingwuzhou Changjiang River Bridge in Wuhan

The main bridge of Yingwuzhou Changjiang River Bridge in Wuhan is a three-tower four-span earth-anchored suspension bridge with span arrangement of(200+2×850+200)m.To counteract the bridge deck pavement damage,detaching and displacement,the main girder is designed as the steel-concrete composite girder structure covered with modified asphalt SMA pavement.To suit the new structural design,all the elements of the steel stiffening girder were prefabricated and assembled by long line method in the specialist steel structure workshop.The concrete deck slabs were also factory-made.The concrete deck slabs and the steel stiffening girder in the side spans were combined by using the two-phased combining construction technique,by which the elements in each section were combined first and then,the overall sections were combined.But for the concrete deck slabs and the steel stiffening girder in the intermediate spans,the concrete deck slabs in each section were temporarily fixed,and then connected by the wet concrete joints that were cast batch by batch.The engineering experience proves that the construction techniques used to the steel-concrete composite girder of the bridge exhibit sound effect.