闵浦三桥越江工程总体设计

Overall Design of Minpu Bridge III Cross-river Project

摘要:

闵浦三桥越江工程主桥采用双层桥面钢-混凝土组合箱形截面，结构体系采用独塔四跨斜拉-连续协作体系。工程采用110 m×28.5 m通航标准，按此标准设计非机动车道的纵坡不满足规范要求，为解决非机动车过江问题，设计采用安装大型垂直电梯的垂直交通方案。引桥采用预制立柱、盖梁和小箱梁的拼装结构，使桥梁达到最大的预制拼装率。同时为解决桥梁穿越二级水源保护区问题，大桥工程设置了三座蓄毒沉砂池作为危险品污染事故的缓冲处置设施，加强环境保护，提升环境韧性。

Abstract:

The double-deck steel-concrete composite box section is used for the cross-river bridge. The structural system is a single-pylon four-span cable-stayed continuous cooperative system. The 110 m×28.5 m navigation standard is used in the Minpu Bridge III Cross-river Project. The longitudinal slope of non-motorized lanes designed according to this standard does not meet the requirements of the specification. In order to solve the problem of non-motorized vehicles crossing the river, the vertical transportation scheme of installing the large elevators is used in the design. The structural assembly structure of prefabricated columns, bent caps and small box girders is used for the approach bridge, which can make the bridge achieve the maximum prefabricated assembly rate. At the same time, in order to solve the problem of the bridge crossing the secondary water source protection area, three toxic sedimentation tanks are constructed as the buffer disposal facilities of dangerous goods and pollution accidents to strengthen the resilience of environmental protection.