某外海码头特大引桥装配式桥墩设计技术

Design technology of prefabricated piers for a large approach bridge of offshore wharf

以某外海无掩护海域特大型接岸引桥为例,针对其建设规模大、地质条件复杂、下部桥墩结构在工程投资中占比高、风浪条件差、可作业时间短、工期难控制等问题,对下部桥墩结构方案进行了技术经济比较,得出应用高桩墩台结构更优的结论。并针对工程桥墩数量多、尺度标准化程度高的特点,提出预制装配式桥墩的优化设计方案。结果表明:该结构的应用大大减小了现场混凝土浇筑量,为降低施工难度、确保工期、降低施工期安全风险提供了有利保障。可为类似外海水工建筑物的设计提供借鉴。

This paper takes a typical oversize shore-connecting approach bridge in an open-sea area as an example to compare the technologies and economics of lower pier structure schemes.This study considers many problems of this approach bridge,including its large construction scale,complex geological conditions,a high proportion of the lower pier structure in the engineering investment,poor wind and wave conditions,short working time,and difficult control over the construction period.The comparison indicates that the high-pile pier structure is better in the application.Moreover,according to the characteristics of a large number of engineering piers and high standardization of scale,the paper proposes an optimal design scheme for prefabricated piers.The results show that the application of the structure greatly reduces the amount of concrete pouring on site,and the structure provides a favorable guarantee for reducing the construction difficulty and safety risks during construction and ensuring the construction period.The research can provide a reference for the design of similar offshore hydraulic buildings.