超大哑铃形双壁钢套箱围堰设计

Design of a Super Large Dumbbell-shaped Double-wall Steel Boxed Cofferdam

武汉青山长江公路大桥北主墩位于天兴洲侧深水中,基础为99.6m×39.2m×9m的哑铃形承台,采用双壁钢套箱围堰进行施工。根据基础结构形式、地质及水位条件对围堰结构进行设计,并针对围堰施工中各阶段的受力情况建立整体模型进行分析和计算,使围堰设计满足施工要求。该围堰的设计有效解决了深水超大哑铃形承台的施工难题,保障了工程的顺利进行。

The north main pier of the Qingshan Changjiang River Highway Bridge in Wuhan is located in the deep water of the Tianxingzhou side,and the foundation is a99.6m×39.2m×9m dumbbell-shape pile cap,which is constructed by double-walled steel boxed cofferdam method.The cofferdam is designed based on the foundation structure,geology and water level conditions.The overall model is established for analysis and calculation of the stress in each stage of cofferdam construction,so that the cofferdam design meets the construction requirements.The construction problems of the super large dumbbell type bearing platform in the deep wateris effectively solved by the design of the cofferdam,which ensures the smooth progress of the project.