采用水上深基坑围护法建造特大型船坞坞口的创新设计

中船长兴造船基地1～4号船坞是国内规模最大的船坞工程,其中的1、2号坞由于受诸多因素的影响,总体上未采用常规的大围堰包围干施工方案,而是创造性地先利用二个独立的水上深基坑围护建造坞口,后用坞门挡水干施工坞室结构。本文简要介绍了在长江口这样一个自然条件比较恶劣的水域,利用钢板桩进行水上深基坑围护建造特大型船坞坞口的设计方案,并对本工程区别于常规陆上深基坑工程的特点及难点进行了详细的分析,以期为类似的船坞工程和水上基坑围护工程提供借鉴和参考,并对正在进行的工程施工起一定的指导作用。

Creative design of super large dry-dock head construction by means of deep steel sheet piling excavation in water area

Docks 1~4 in Changxing Shipbuilding Base,CSSC,are the fourth largest undergoing dry docks in China.Due to the critical site conditions,Dock 1 and Dock 2 projects adopt two independent deep steel sheet piling excavation pits to build the two dock heads respectively,instead of adopting a conventional very large cofferdam.After the dock gates setting,dry grounds for the two dock chambers are obtained.The design scheme of adopting deep steel piling excavation to build super large dry dock head in accordance with the critical natural conditions of Yangze River estuary was introduced,and a comprehensive analysis of the characteristics and difficulties of this design was compared with those of deep pits on land.It is a reference to similar dry-dock projects as well as an instruction for the undergoing dry-dock projects.