某特大桥双壁钢围堰设计与施工

On the Design and Construction of the Dual-Walled Steel Cofferdam for a Mega Bridge

以某特大桥64#桥墩双壁钢围堰为例,对钢围堰不同工况下的整体抗浮性进行检算,并利用MIDAS CIVIL软件计算钢围堰各构件强度,结果表明,钢围堰整体抗浮性和强度均满足规范要求。对钢围堰施工过程中清理河床、钢围堰下沉、灌注水下混凝土封底等关键工序采取相应的技术措施,确保施工顺利完成,为同类工程的设计和施工提供有益的参考。

With the dual-walled steel cofferdam for the 64 th pier of a mega bridge as an example,the integral anti-floating performance of the steel cofferdam in different construction conditions is checked in the paper,with the strength of each of the members of the steel cofferdam calculated by means of the software of MIDAS CIVIL.The result of the calculation shows that both the integral anti-floating performance and the strength of the steel cofferdam are up to the requirements of the technical specifications.In the course of the construction of the steel cofferdam,corresponding technical measures for the key processes of the construction,such as clearing the river bed,sinking the steel cofferdam,pouring the underwater concrete to close the bottom and the like,are taken to ensure the smooth implementation of the construction.The paper may serve as a useful reference for the design and construction of other projects of the same type in the future.