电厂排水口围堰设计与施工

在广西钦州电厂二期扩建工程D标段排水口围堰工程的施工建设过程中，需要设置临时围堰进行止水、降水，以获得干施工作业条件。经过方案比选及优化、科学计算及合理论证，采用了充填砂袋、旋喷桩、钢板桩、灌注桩、砖砌止水墙、止水圈梁、止水黏土墙等结构相结合的组合形式。利用不同止水结构的特点，对不同环境条件下的水域、陆域围堰结构进行了合理的优化和设计，有效解决了局部空间狭小、水头差过大等施工难题，获得了良好的工程实效。该方法在类似工程的方案设计优化及选择等方面，具有一定的参考价值。

Design and construction of cofferdam for outlet of power plant

Temporary cofferdam is needed to stop water and dewatering during the construction of the outlet cofferdam in the D section of the second phase extension project of Guangxi Qinzhou power plant,so as to obtain the dry construction conditions.After scheme comparison and optimization,scientific calculation and reasonable demonstration,the combined structure of filling sand bag,jet grouting piles,steel sheet pile,cast-in-place pile,brick water-stop wall,water-stop ring beam and water-stop clay wall is adopted.Based on the characteristics of different water-stopping structures,the structures of cofferdams in water area and land area under different environmental conditions are optimized and designed reasonably,which effectively solved the construction difficulties such as small local space and large head difference,and achieved good engineering results.This method has certain reference value in the design optimization and selection of similar projects.