Construction Technology of Rail-cum-road Double-deck Steel Box-truss Composite Girder Bridge with Mixed Layer Layout
The rail-cum-road main bridge of Changjiu high speed railway Yangzizhou Ganjiang Railway Bridge is 49+144+320+144+49 m twin-tower harp-cable surface semi-floating system cable-stayed bridge with symmetrical layout of mixed layer.A double-track ballastless high-speed railway is arranged in the middle of the lower deck,and a two-way 4-lane urban main road is arranged on both sides.The upper deck is equipped with a two-way 8-lane urban expressway.The main beam is com-posed of double layered steel box-truss composite beam with cantilever girder.The structural form is novel and the structure is complex.The overall design and construction details are elaborated in detail.In order to study the stress performance,establish a refined entity segment model to carry out local stress analysis.The transport scheme and corresponding installation scheme of the main beam are studied combined with the water transport conditions along the way.The results show that the design of the composite beam with cantilever box girder is reasonable,the local stress of the upper and lower bridge panels is small,there is no large stress concentration at the joint position,and the torsion span ratio of the bridge across the highway surface meets the standard requirements.The space arrangement of composite beam deck with cantilever box girder is reasonable and has good economy,which can provide reference for the future mixed-layer bridge construction.
rail-cum-road bridgemixed layout of road and railsteel box-truss composite girder with cantilever armconstruction technology
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