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本文结合河南省S302改建工程南水北调大桥,对桥梁方案进行了优化比选,提出了采用一种新的桥梁结构——预应力混凝土槽型梁+钢桁架组合体系。该种桥型方案具有跨越能力强、建筑高度低、适宜采用顶推施工等优点,能很好的满足跨越既有南水北调干渠关于施工、运营期环境保护方面的要求,其较低的建筑高度可有效降低桥头路基填土高度,对具有集散功能的地方道路具有很大的吸引力。
In this paper, the bridge project of S302 reconstruction project in Henan Province is optimized and compared with that of the South-to-North Water Diversion Project. A new bridge structure-prestressed concrete trough beam + steel truss system is proposed. This type of bridge scheme has the advantages of strong crossing ability, low building height, suitable for pushing construction, etc., which can well meet the requirements of environmental protection during the construction and operation period of the existing South-North Water Diversion Canal. Its lower building height Effectively reducing the height of bridge subgrade filling has a great attraction for the local roads with the distribution function.