盐通高铁跨通榆河桥位桥式研究

Research on the Bridge Site and Type of Yancheng-Nantong High-Speed Railway Across Tongyu River

盐通高铁盐城南特大桥小角度跨通榆河,考虑车站设置、线路走向、环保、防洪、通航要求等控制因素,研究比选了桥位方案,并依据跨度要求推荐了连续梁-拱桥、矮塔斜拉桥和连续钢桁-柔性拱桥三种方案,从技术特点及施工难度、可维护性、环保、景观、工期、经济性及其他方面对桥式方案进行分析研究,结果表明主桥采用(110+228+110)m连续梁-拱桥方案最优。大跨度混凝土连续梁-拱桥具有结构刚度大、工后徐变小、造型美观、施工工艺成熟、施工干扰少、后期维护少、环保优及经济性佳等优点,为类似跨度桥梁在相同区域或类似地质条件下的应用提供借鉴及参考。

Yancheng South Grand Bridge of Yancheng-Nantong High-speed Railway crosses the Tongyu River at a small angle.Considering the control factors such as station setting,line direction,environmental protection,flood control,and navigation requirements,the bridge site type has been studied and compared,and three schemes of continuous beam-arch bridge,low tower cable-stayed bridge and continuous steel truss-flexible arch bridge are recommended according to the span requirements.The bridge type scheme is analyzed and studied from the technical characteristics and construction difficulty,maintainability,environmental protection,landscape,construction period,economy and other aspects.The results show that the main bridge with(110+228+110)m continuous beam-arch bridge is optimal.The long-span concrete continuous beam-arch bridge has the advantages of high structural rigidity,small post-construction creep,beautiful appearance,mature construction technology,less construction disturbance,less post-maintenance,excellent environmental protection and good economy,etc.,it provides reference for the application of similar span bridges in the same area or similar geological conditions.