The second phase of Baili Qiantang comprehen-sive improvement and upgrading engineering in Haining City is located in the strong tidal bore area of Qiantang River.The engineering has a large scale and complex environmental conditions,and there are great technical difficulties and safety risks in the construction of pipe bag cofferdam.In this regard,combined with the engineering geology and tidal hydrological characteristics,this paper puts forward the key technology for pipe bag cofferdam construction in seawall improvement and upgrading in strong tidal bore area from the aspects of cofferdam con-struction materials,construction process and key preven-tive measures.Practice shows that a series of processes and technologies adopted in the second phase of Baili Qiantang comprehensive improvement and upgrading en-gineering in Haining City(the seawall in Jianshan section)can effectively solve the problems in the construction of seawall upgrading and reinforcement in strong tidal bore area,reduce safety risks,shorten construction period and save costs,which can be used for reference by similar en-gineering in strong tidal bore area.
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