三江口电站扩建工程取水建筑物设计

Water Intake Structure Design in Enlarged-Project of Sanjiangkou Hydropower Station

在三江口水电站扩建工程中，通过对首部不同的取水方式进行了技术和经济的综合比较，最终选择过河埋管的取水方式。其优点在于施工简单可行，不影响阿鸠田电站河边挡墙的安全，取水较为方便，且可保留电站原取水系统。取水建筑物的创新布置，表现在“越河取水”、洞内消能和流态过渡，尤其在“越河取水”的设计特点上打破了水电工程中传统的岸边引水发电方式。本文主要对衔接竖井、过河埋管、汇合隧洞等主要取水建筑物的设计进行介绍。三江口水电站扩建工程于2005年7月开工，2006年8月1日引水系统正式通水，同年12月6日扩建第一台机组并网发电。至今电站运行了一年多，扩建后的取水建筑物和原取水建筑物运行情况良好。

Comparing technical and economic of different water intake structures, The embedded penstock across river was adopted during enlarged-project of Sanjiankou Hydropower Station, since not only the construction was simple, but also the retaining walls ofA＇jiutian Hydropower station was not affected, and original water intake structures would be retained. The innovative design of water intake structures which was different from traditional water intake scheme has three advantages： water intake by across river, energy-dissipation and transition of flow pattems in tunnel of water intake. Vertical shaft with embedded penstock across river and confluent tunnel design was introduced in this paper, the enlarged-project began on July 2005, and water intake structure was first used on August l, 2006, the first power generator operated on December 6, 2006. Up to now, Sanjiangkou Hydropower station have been run for one more year, the new and the old water intake structures are in good order.