多跨连续桥梁悬臂盖梁结构设计及施工工艺研究

Structural Design and Construction Technology Research of Cantilever Capping Beam on Multi-Span Continuous Bridge System

当今世界范围城市桥梁呈规模化建设,各类公路、铁路高架桥种类繁多,线路走向受制于自然地质、社会既有建筑、土地权属等多方面因素。基于此,在桥梁工程设计中需采取“避让”原则或设计为悬臂结构,既能满足桥梁整体设计线形要求,又能最大程度规避潜在冲突。本文依托新加坡大士西轨道延长线项目,针对悬臂盖梁配筋或配束对悬臂长度的影响,从设计、施工角度,对悬臂结构在结构设计、施工可行性、施工成本和便利性等方面进行综合分析,其研究方法及所得结论既可高效优化设计,又可指导便利施工。

With the large-scale construction of urban viaducts in the world today, there are many types of highways and railway viaducts in cities, and the design route is subject to the influence of various factors such as natural environment, external social condition, and private land. Based on the above, in the viaduct design stage of infrastructure construction, the principle of “avoidance” or the design of the cantilever structure should be adopted, which can not only meet the requirements of the overall design alignment of the bridge, but also avoid potential conflicts to the greatest extent. This article is based on the Tuas West Rail Extension Project in Singapore to comprehensively analyze the structural design, construction feasibility, construction cost and convenience of the cantilever structure from the perspective of design and construction by considering the influence of cantilever capping beam reinforcement or bundle on the cantilever length, and its research methods and conclusions can not only optimize the design efficiently, but also guide the convenient construction.