韩家沱长江大桥方案选择与通航问题的研究

根据桥位选择的基本原则,在模型试验的基础上,从航道条件、河床演变、通航水流条件等方面对上、下桥位进行比较,得出韩家沱桥位（上桥位）为推荐桥位。通过对上、下桥位各桥型方案的通航净空尺度、桥墩位布置和施工因素对通航影响等方面进行研究,确定将韩家沱桥位432 m双塔斜拉桥作为推荐桥型。最后对建桥后的通航水流条件进行验证,并与建桥前进行比较,得出建桥后对库区航道通航影响较小,故韩家沱长江大桥方案选择合理可行。

Project scheme selection and navigation problems of Hanjiatuo Changjiang River bridge

According to the basic principles of bridge site selection,based on the model test on the upper and lower bridge sites,the comparison of the channel conditions,the fluvial processes,and navigation flow conditions,we determine Hanjiatuo bridge site（the upper bridge site） as the recommended bridge site.Through the research on the navigation clearance dimension for various bridge types,and considering the influence of pier layout and construction factors on navigation,we choose the 432 m Twin Towers cable-stayed bridge on Hanjiatuo bridge site as the recommended bridge type.Moreover,by verifying the navigation flow conditions after the construction of the bridge and comparing flow conditions before the bridge construction,we obtain the conclusion that the influence of bridge construction on the channel navigation is very small,so the scheme for Hanjiatuo Yangtze River bridge is reasonable and feasible.