Construction Technique for Steel-Concrete Joint Section of Hybrid Girder Rigid-Frame Bridge

The main bridge of Oujiang Bridge in Wenzhou city,Zhejiang Province is a hybrid girder rigid-frame bridge with span arrangement of(84+200+84)m.The 80m-long midspan section of the intermediate span adopts the steel box girder,the remaining part adopts concrete box girder,and the steel-concrete joint section adopts the form of bearing plate with grilles.To ensure the construction quality,the steel-concrete joint section was vertically placed in the prefabrication process.When the temporary hoisting points were installed and the age of the concrete met the requirements,the steel-concrete joint section was floated to the bridge site by barges.Then,the deck crane was used to turn the steel-concrete joint section,and monolithically hoist and erect the steel-concrete joint section to the design elevation,subsequent to which the joint between the concrete cantilever girder section and the steel-concrete joint section was cast in place.