Key Construction Techniques for Side Spans of Long-Span Rail-cum-Road Steel Truss Arch Bridge
With a main span of 388 m and two side spans of 168 m,the Tianxingzhou Special Ship Channel Bridge is a long-span steel truss arch bridge accommodating heavy road and rail loads.The deck system consists of two main trusses that act compositely with the upper and lower orthotropic steel panels.The steel girders in the side spans were cantilever-assembled with individual members using deck cranes.To ensure the axial and vertical alignments of the steel girders in side spans,the principle of"forming a stable truss structure as fast as possible"was followed,before landing on the top of piers,the individual members of the trusses were assembled to be stable triangular structures first,and then cushioned to keep close contact with the pier top.During the erection,the elevations of the steel girders were dependently adjusted to accurately control the elevations of the steel girders when landing on pier tops.To ensure that the mechanical property of the steel girders in side spans could meet the requirements,numerical simulation was carried out to determine the optimal removal time of the auxiliary piers.The superstructure in the side spans was accurately positioned using a"spatial six-point positioning method",and the bearings rest on the main piers were gravity-grouted.Based on the multi-point deformation coordination,the truss members assembly process was modified to achieve the installation of members with forces in the statically indeterminate structure.
steel truss arch bridgecantilever-assembly of individual memberslanding-on-pier-top elevationtemporary pier disengagementstee girder position tuningbearing groutinginstallation of members with forceconstruction technique
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