About the author:

Engineering Technology Institute of China Railway No. 4 Engineering Group,Hefei, Anhui 230022,China

Abstract:

The main structure of the approach bridge of Hutong Yangtze River Bridge across the southbank embankment adopts a simply-supported steel truss double-layer composite beam structure with a112-meter span. The upper highway bridge deck adopts concrete bridge deck slab,while the lowerrailway bridge deck adopts concrete trough girder. Based on the approach bridge, this paper introducesits composite bridge deck construction technology in detail. The bridge deck slab and trough girder areprefabricated in the factory. After the erection of the steel truss girder, the design stipulates that theinstallation and combination of the highway deck must precede those of the railway trough girder. Due tothe significant vertical clearance between the bridge deck and ground, the heavyweight prefabricatedcomponents, and the simultaneous construction of adjacent bridges, the selection of vertical liftingequipment for transporting components onto the bridge is constrained, and longitudinal transportation onthe deck faces challenges. The interference between the construction of upper and lower decks furthercomplicates the process. Notably, the installation of the upper bridge deck slab reduces availabletransportation methods for the lower trough girder, significantly increasing the difficulty of constructionorganization and quality control. Through comprehensive demonstration and innovation, it has been foundthat the use of two derrick girder erecting machines for steel truss girder erection in the construction ofhighway bridge deck slab results in low equipment investment and high construction efficiency; The fixedoutrigger lifting station is used to lift the railway trough girder and install it with the integrated troughgirder launching gantry,which solves the problem of limited space operation on the railway deck. The trough girder is constructed after the highway bridge deck is combined,which reduces the interferencecaused by process crossing, eliminates the disturbance of railway bridge deck operation on wet joints ofhighway bridge deck. Combined with the improvement of construction technology in installation andcombination, the construction quality is effectively guaranteed.