某水道桥水中基础钢围堰方案设计

STEEL COFFERDAM DESIGN OF FOUNDATION-IN-WATER IN A AQUEDUCT BRIDGE

以鸡鸦水道桥水中基础施工为背景,依据水下承台布置特点和施工空间,分别提出了钢板桩围堰和双壁钢围堰两种方案,并对两种钢围堰方案进行了具体方案设计与力学分析。从结构受力角度而言,两种方案经过优化后,均可用于该桥水中基础的围护施工。考虑双壁钢围堰整体受力性能优越,既有材料与工艺熟练,选用双壁钢围堰作为鸡鸦水道桥水中基础施工方案。

In this paper,foundation-in-water in Jiya aqueduct bridge was taken as engineering background,two scheme of steel sheet pile cofferdam and double-wall steel cofferdam were purposed respectively according to pile cap layout feature and construction space,and specific design and mechanical analysis about the two steel cofferdam were done.From the safety of structural stress view,the two steel cofferdams can be used to'envelope construction of this foundation in water after optimization.Finally,double-wall steel cofferdam was selected considering on superior whole mechanics performance,existing materials and mature technology.