巨型深水围堰比选研究与设计施工

Comparison study and design-construction of huge deep-water cofferdam

对常用深水基础施工围堰形式进行分析,比较双壁钢围堰、锁口钢管桩围堰、钢板桩围堰方案的优缺点及其适用特点。依托五峰山长江大桥3号主墩,在地质差异不均匀、不平衡土压力大、抽水水头大、平面尺寸大的情况下,详细介绍哑铃形双壁钢围堰的设计思路、设计要点、结构构造和计算;根据围堰重量大、尺寸大、加工质量要求高等特点,详细介绍围堰制作与运输、拼装与下沉、封底与抽水施工过程,为类似工程承台顺利施工提供设计与施工借鉴。

The common forms of deep water foundation cofferdam construction were analyzed,the advantages and disadvantages of double wall steel cofferdam,lock steel pipe pile cofferdam and steel plate pile cofferdam were compared.Relying on the No.3 main pier of the Wufengshan Bridge,in the case of uneven geology,large unbalanced earth pressure,large pumping head and large plane size,we introduced in detail the design idea,main points of design,structure and calculation of dumbbell type double-wall steel cofferdam;according to the characteristics of large weight,large size and high processing quality requirements of the cofferdam,we introduced in detail the construction process of cofferdam making and transporting,assembling and sinking,bottom sealing and pumping,which provides reference for the design and construction of pile caps of similar projects.