艳洲枢纽工程一期纵向围堰方案研究

Longitudinal cofferdam scheme for Yanzhou hub project phase I

针对混凝土围堰水上与水下两部分结构设计与施工工艺,以艳洲枢纽工程一期纵向混凝土围堰为例,通过对多种围堰水上部分结构设计及水下部分施工工艺进行比选分析,水上部分优选重力式设计方案,水下部分优选预制套箱工艺。理论计算结果及现场实践表明:重力式方案在可靠性、结构稳定性、施工难易程度等方面更具优势。与传统钢套箱工艺相比,采用预制套箱工艺,施工周期可缩短22 d,规避钢套箱周转环节,施工总成本节约183万元。研究成果为同类型工程的围堰设计及施工提供参考。

Regarding the design and construction of the above-water and under-water structures of the concrete cofferdam,taking the longitudinal concrete cofferdam of the Yanzhou project phase I as an example,through the comparison and analysis of the structure design of the above-water part and the construction technology of the underwater part of the cofferdam,the gravity design scheme of the above-water part and the prefabricated casing technology of the underwater part are optimized.The results of theoretical calculation and field practice show that the gravity scheme has more advantages in reliability,structural stability and ease of construction.Compared with the traditional steel box technology,the prefabricated box technology can shorten the construction period by 22 days,avoid the steel box turnover,and save 1.83 million yuan construction cost.The research results can be used for reference in the design and construction of cofferdams of the same type of hydraulic engineering.