禹长段颍河倒虹吸施工围堰填筑及防渗处理

摘要

Yinghe inverted siphon project is one of an important structures in Yuzhou to Changge section of Middle Route Pro-ject of South to North Water Diversion. The construction technology of the cofferdam is introduced in detail from the aspects of cofferdam design, construction layout, cofferdam construction, anti-seepage treatment and cofferdam removal. The seepage a-mount after the cofferdam construction meets the demand of the design because of the reasonable design, correct calculation and orderly construction, which is helpful for the later excavation and concrete pouring and ensures the project safety during flood pe-riod.%南水北调中线总干渠采用倒虹吸穿越颍河，倒虹吸施工需在围堰保护下进行。从围堰设计、施工布置、围堰施工、防渗处理及拆除等方面对围堰施工技术进行了详细介绍。工程实践证明，由于围堰设计合理、计算准确、施工有序，围堰建成后渗流量完全满足设计要求，为后续的基坑开挖和混凝土浇筑提供了良好的干地施工条件，确保了该工程的安全度汛。