2×150 m独塔斜拉桥结构型式及构造设计

混凝土独塔斜拉桥采用联塔分幅的结构型式在国内外均属少见。南仓道立交桥跨越铁路南仓编组站、铁路京山线、在建的京津城际铁路等重要铁路干线。受规划及建设条件限制,主桥采用联塔分幅的独塔4索面混凝土斜拉桥,用前支点挂篮悬浇施工。介绍了方案构思的特点、结构体系拟定、塔形方案比选及施工方案的选择。

Structure Form and Construction Design of Single-Tower Cable-Stayed Bridge with Span 2×150 m

There are few RC single-tower cable-stayed bridges with connected tower and separated decks in internal and international bridge engineering.Nancangdao Interchange spans Marshaling Station in Nancang City,Jingshan Railway,and Jingjin Railway in construction,etc trunk railway lines.Limited by plan and construction conditions in site,the main bridge adopts singel tower cable-stayed bridge featuring a jointed pylon and separate decks with four cable planes,and the construction technolodge adops cast-in-place cantilever method.In this paper,the bridge type consideration,structure system studying out,tower shape comparison and selection,construction plan selection are presented.