滨北线松花江公铁两用桥改建工程市政桥梁方案设计

Conceptual Design for Municipal Bridge in the Reconstruction Project of Harbin-Beian Highway and Railway Transit Bridge over the Songhua River

为满足纵横向不同跨越需要，保证新（旧）铁路及规划大堤运营安全，解决严寒地区小半径曲线高墩钢桥及超宽桥、高低墩框架墩在温度作用下的受力安全和正常使用等问题，对滨北线松花江公铁两用桥改建工程市政桥梁主要节点设计方案进行研究。包括：既有铁路拆除后江北大堤桥采用主跨80m变截面连续钢箱梁桥，江南小半径曲线匝桥和主线异形段采用主跨约30～55m等截面连续钢箱梁桥、曲线桥采用中墩墩梁回结和连接墩双支座体系，主线桥采用大跨径预应力盖梁框架墩（超宽桥特殊处理），采用钢板桩围护和咬合高压旋喷桩桩墙分别对既有铁路和江北大堤进行防护等。

In order to meet longitudinal and transverse spanning requirement, guarantee daily operation safety for rebuilt or existing railway and planning embankment, and solve the problems of structural safety and regular service under temperature action in severe cold region for small radius steel curved bridge with high pier and frame pier with high or low pier especially for super-wide bridge, this paper carded out a research on conceptual design for key points of municipal bridge in the reconstruction project of Harbin-Beian highway and railway transit bridge over the Songhua River. The north embankment bridge was a continuous steel box girder bridge with a main span of 80 m after the demolition of the existing railway, the south small radius curved bridge and special-shaped segment bridge were composed of continuous steel box girder bridge with main span of 30 -55 m, and pier beam consolidation and dual support system were used for the south small radius curved bridge. Long-span prestressed capping beam frame pier was applied in the main line bridge and special method was used for super-wide bridge, steel sheet pile enclosure and high pressure jet grouting pile were also applied to protect the existing railway and the north embankment separately.