天生桥一级水电站坝面过水设计和施工实况

天生桥一级水电站施工，初期导流采用枯期围堰挡水、汛期坝面和导流洞联合泄流的方式；后期导流采用坝体临时挡水、放空洞和溢洪道临时过流断面联合泄流的方式。本工程施工导流设计流量大、建筑物规模大、运行时间长、与水工枢纽布置关系密切，是我院大、中型工程施工导流颇具特色的一个工程

Overtopping Design and Construction Practice of Dam Face for Tianshengqiao-I Hydropower Project

The construction diversion of the Tianshengqiao-I Hydropower Project has such features that at the initial stage the cofferdams are used for river diversion in the dry seasons, and the dam face and the diversion tunnel are combined to release floods in the flood seasons, while at the late stage the dam body is used to retain flood for temporary purpose, and the intermediate outlet tunnel and the temporary overflowing section of the spillway are used to jointly discharge flood for river diversion. For this project, the construction diversion design discharge is large, the size of the construction diversion structure is also large, the operation duration is long and the construction diversion facilities are closely related with the layout of the hydrotechnical structures. This is a special river diversion works with distinctive features among the large and medium size construction diversion works designed by our Institute.