Design and Construction of Long Span Continuous Steel Box Girder Bridge

The continuous steel box girder bridge with span arrangement(44+79+44+37) m of the Interchange on the Middle Ring Road spanning the New Gonghe Road in Shanghai City is great in span length,large in construction scale and the deck of the bridge has variable width 30.8 ～ 44.1 m.To maintain the traffic flow on and under the existing New Gonghe Elevated Road in construction of the box girder bridge,the construction method of large steel block assembling and less scaffolding was applied.The geometric shape and internal forces of the girder bridge were adjusted in the construction and satisfactory results of both the stress and geometric shape of the girder after system transferring were achieved.In this paper,the principal design and construction features of the girder bridge are presented.