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主桥下部结构设计包括主墩人工岛结构、各墩承台及桩基、1号及5号墩身等内容。主墩及2号墩身为上部结构设计范围。下部结构设计中的一个主要问题是船舶的撞击,主墩由于受力要求必须采用双柱式柔性墩,防撞能力很弱,而航运部门又要求通过5000吨并兼顾7000吨海轮,船舶的撞击力较大,如何有效而又是经济的来防止船舶的撞击就成为在通航河流上大跨径连续刚构桥的一个主要课题。
The design of the substructure of the main bridge includes the structure of the main pier artificial island, the pier and pile foundation of each pier, the piers No. 1 and No. 5, etc. The main pier and pier No. 2 for the superstructure design range. One of the major problems in the design of substructure is the collision of ships. Due to the requirement of force, the main pier needs to adopt the double-column flexible pier. The anti-collision capability is very weak. However, the shipping department also requires the passage of 5,000 tons and taking into account the impacts of 7,000 tons of marine vessels and ships How to effectively and economically prevent the impact of a ship becomes a major issue in the long-span continuous rigid frame bridge on navigable rivers.