城市立交跨越既有轨道交通的门架墩方案分析比选

新建城市立交桥跨越现状地铁轨道区间的情况越来越普遍,大跨度门架结构因此得到广泛应用。本文结合福州市二环路白湖亭立交桥A10墩跨越福州地铁1号线工程实例,通过对墩位处情况研究,提出3种结构形式的门架设计方案,并从模型计算分析、施工方案、经济指标等方面对3种方案进行分析比较,选择出最优方案。结果表明:钢-混组合结构为最优方案。该门架方案的分析比选过程,可为同类型涉轨工程设计提供参考和借鉴。

Analysis and Comparison on Urban Overpass Portal Pier Crossing over Existing Metro

As more and more new urban overpass crossing the existing subway section,the large-span portal pier is widely used.Based on Fuzhou 2nd Ring Road Baihuting flyover A10 pier which crossed Fuzhou Metro Line 1,this paper put forward three structural design schemes of portal pier,and then analyzed and compared three schemes from the aspects of model calculation construction scheme and economic index to select the optimal scheme.The results showed that the steel-concrete composite structure is the best scheme.The research process and the portal pier scheme should provide reference for the design of similiar engineering.