福平铁路乌龙江特大桥主桥桥式方案设计研究

Design and Research of the Type of Wulongjiang River Super Large Bridge on Fuzhou-Pingtan Railway

研究目的:福平铁路将京福铁路通路从福州延伸至大陆最前沿,是服务于平潭综合实验区、两岸先行先试的重要举措,适应海峡西岸经济区最新发展要求,乌龙江特大桥是福平铁路的重要工程。本文结合线路、地形、通航、地质等情况,比较选择乌龙江特大桥主桥桥式方案,使福平铁路以较为经济合理的桥式方案跨越乌龙江,同时满足桥梁的美观、经济、动力性能、技术、施工与养护等方面的要求。研究结论:(1)连续刚构部分斜拉桥桥式方案新颖美观、经济合理,为铁路桥梁上首次采用斜拉索体外加劲大跨度连续刚构,可大大改善主梁受力,减小跨中徐变下挠,是本桥的最佳方案;(2)乌龙江特大桥主桥采用(144+288+144)m连续刚构部分斜拉桥方案,保证了结构内力和后期徐变,能满足静动力特性要求,具有一定的经济性、美观性;(3)作为合理施工实施方案,其设计经验可为今后同类型桥梁的设计提供可借鉴的经验。

Research purposes： As an important measure that serving the Pingtan comprehensive experimental zone and the cross - strait trying beforehand, Fuzhou - Pingtan railway will extend Beijing - Fuzhou Railway to the forefront of the mainland from Fuzhou, which meet the latest requirements of the development of the economic zone in the west coast, Wulongjiang bridge is the key project of Fuzhou - Pingtan railway. Having taken line, terrain, navigation, geological conditions into consideration, we compared and fixed the main bridge style to ensure the economy and rationality of the way in which Fuzhou - Pingtan railway leaping over Wulongjiang , as well as the the beauty, economy, dynamic performance, technique Research conclusions： construction and maintenance of the bridge. 1 ） With the novelty ,beauty, economy and rationality, Continuous Rigid Frame partially cable - stayed bridge style will be applied in railway for the first time. It is the best scheme for this bridge for its capacity of optimizing the forces of the beam and largely reducing the Creep deflection of the midspan. （2） Wulongjiang Bridge will take the（ 144 ＋288 ＋ 144）m continuous rigid frame partially cable -stayed bridge style, which can ensure the force of the structure and the creep deflection, and meanwhile meet the static and dynamic requirement with some economy and beauty. （3） As a reasonable construction scheme, this bridge can provide some instructive experience to the subsequent bridges in the same style.