滨北线松花江公铁两用桥改建工程总体设计

既有线改建工程设计方案要充分考虑新旧设计标准对接、对既有线运输影响、工程造价及建设难度,并需关注方案的可实施性,努力实现新旧工程整体最优。结合滨北线松花江公铁两用桥改建工程的总体设计,分析了该桥址的建设条件;通过对桥位、通航孔跨度、桥型结构等方面进行方案比选,决定采用下游50 m桥位,主桥主通航孔为四跨(96+2×144+96)m连续钢桁梁桥,其余为6-96 m简支钢桁桥,引桥采用32 m预应力混凝土简支T梁的建设方案;并对主桥结构设计及指导性施工方案进行了阐述。

General Design of Reconstruction of Rail-cum-road Bridge on Binbei Railway over the Songhuajiang River

The old and the new design standards, the impact on the existing railway transportation, project cost and con- struction difficulty should be fully considered in the design plan of reconstruction project of the existing railway. And close attention should be paid to the feasibility of implementation of design to realize the best overall integration of the old and the new projects. Combined with the general design on reconstruction project of rail-cum-road bridge over the Songhuajiang Riv- er in Binbei Railway, construction conditions of bridge site is analyzed ; through the comparative analysis of bridge location, navigable span and bridge structure etc. , the development scheme has been adopted the downstream 50 m bridgesite, （96 ＋ 2 x 144 ＋ 96 ） m four span continuous steel truss bridge as the main navigation span bridge and 6 - 96 m simply supported steel truss bridge. And approach bridge adopted the construction scheme of 32 m prestressed concrete simply supported T beam. The main bridge structure design and guiding construction scheme are also expounded in the paper.