Research On The Double-Decked Contilever Construction Control Of North Approach Bridge Of The Caiyuanba Yangtze River Bridge

With the rapid development of Science and Technology and Transport, The road-rail double-decked girder bridge of prestressed concrete not only has the advantages of the prestressed concrete beam bridge, but also can take the advantage of the city space. The foundation works are decreased comparing with constructing bridges respectively. So, the double-decked bridge of prestressed concrete will play an important role in city communication at present.The experiences about cantilever construction control technique of single-decked prestressed concrete bridges are accumulated much more, but the study on double-decked prestressed concrete bridge is not enough. Based on the project of North Approach Bridge of the Caiyuanba Yangtze River Bridge, the analysis of the construction process of the bridge construction is carried out by finite element software. This paper stresses on the linetype and the inter stress influence between the upper and lower floor during the construction of cantilever of double-decked bridge, the shrinkage and creep action to double-decked prestressed concrete bridge in construction calculation that be emphatically analyzed in this paper. The construction control method and parameters of double-decked prestressed concrete beam bridge are given out. This method is confirmed to be suitable and it may provide some valuable experience for the construction control and design of similar bridges.