Abstract:: The new project of Caobao road Expressway in Shanghai involves the reconstruction of the current Jiamin interchange. This paper mainly introduces the transformation scheme of Jiamin interchange, and focuses on the control factors, design characteristics and key points of the main bridge project across the railway corridor. The railway related main bridge within the scope of the project adopts special-shaped continuous steel box girder T-shaped rigid frame bridge used rotation construction method, crossing a total of 7 lines of high-speed railway and ordinary railway. The main bridge across the railway has very wide width, large changes in plane size, special-shaped section layout, and the longitudinal slope of the bridge reaches 6%. The special-shaped structural layout brings the problem of vertical and horizontal extremely unbalanced rotation. The difficulty of extremely unbalanced rotation of long-span bridges can be solved through accurate counterweight, adoption of temporary stay cable auxiliary structure and other measures, which can provide reference for similar projects.
