北京环线特大桥位于北京市,是京津城际铁路从北京南站跨越北京市区的桥梁。桥梁起自北京市区东城区左安门西约700米,向东南方向连续上跨二、三、四、五环路等城市道路,经过丰台区和朝阳区,在上跨通黄路之后终止于通州区台湖镇桂家坟村。桥全长15.6千米,最大跨度出现在上跨四环、五环的主跨,跨度均为128米;跨二、三环主梁跨度则为100米。[1][2][3][4]
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