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以珠海横琴二桥深水埋置型主墩承台施工为依托,探讨在广东沿海淤泥软土特殊地质条件下,拉森钢板桩围堰与双壁钢套箱围堰两种基坑工法的适用性。结合围堰施工工艺与结构概念设计为核心,从工程造价、结构安全风险、施工便利性等因素进行概念分析,确定双壁钢套箱围堰作为基坑支护结构,并对传统双壁钢围堰设计方案进行优化,为类似工程提供借鉴经验。
Relying on the construction of deep pillars of Zhuhai Hengqin embankment, this paper discusses the application of two kinds of foundation pit construction methods: Larsen steel sheet pile cofferdam and double-wall steel box cofferdam under the special geological conditions of Guangdong coastal silt soft soil Sex. Based on the conceptual design of cofferdam construction technology and structure concept, the conceptual analysis of engineering cost, structural safety risk, construction convenience and other factors is carried out to determine the double-wall steel cased cofferdam as the foundation pit supporting structure. Cofferdam design optimization program for similar projects to provide reference experience.