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以沉井保护丁坝 ,丁坝保护海塘在钱塘江整治中取得了较好效果。沉井坝头是较好的技术措施 ,以往需在高滩上建造 ,因钱塘江江道水文条件变化 ,滩地偏低 ,沉井应用受到限制。一般丁坝坝头采用无围堰施工 ,水深流急 ,施工技术难度较大 ,目前常用装石钢筋笼或环梁挂桩进行坝头保护 ,运行维护工作量大。杭州郊区下沙海塘七格 2号丁坝在中低滩上采用土工布充填土管袋大围堰 ,修建沉井丁坝获得成功。
To caisson to protect the Dingba, Dingba protection of the seawall in the Qiantang River remediation achieved good results. The caisson head is a good technical measure, which was constructed on Gaotan in the past. Due to the change of hydrological conditions in Qiantang River, the beach area is low and the caisson application is limited. In general, the dam head of dam is constructed with no cofferdam, and the water depth is in a rush. The construction technology is more difficult. At present, it is commonly used to protect the dam head with steel reinforced cage or ring-beam pile, and the workload of operation and maintenance is large. Hangzhou suburb of Xiasha seawall on the 2nd grid 2 dam on the beach in the use of geotextiles filled cofferdam large cofferdam, construction of caverns dam success.