山区峡谷大跨度铁路桥梁方案设计研究

瓮安至马场坪铁路北延伸线湘江特大桥为大跨度山区铁路桥梁。桥址处山高谷深,建桥条件复杂。综合考虑桥址地理环境、地质、施工便捷性和工程经济性等因素,研究并提出3种可行的桥式方案,通过对结构体系、结构尺寸、施工方法、计算指标、工程造价、施工工期等方面进行研究,推荐120 m+2×235 m+120 m跨径组合的刚构斜拉桥方案。

Study on Scheme Comparison and Selection of Large-span Railway Bridge in Mountain Canyon

Xiangjiang super large bridge on the north extension line of weng'an-machangping railway is a long-span railway bridge in mountainous area.The bridge site is located in high mountains and deep valleys,and the conditions for building the bridge are complex.Considering the geographical environment,geology,construction convenience and engineering economy of the bridge site,three feasible bridge schemes are studied and put forward.The structural system,structural size,construction method,calculation index,project cost and construction period are studied in detail.Finally,the rigid frame cable-stayed bridge with span of 120 m+2×235 m+120 m is recommended as the implementation scheme.The research on the selection of engineering scheme provides reference for the construction of railway bridge with super high pier in mountain gorge.