万家寨水利枢纽5号机组尾水中墩冻融破坏修复处理

Repair of Freezing and Thawing Damage in Tail Water Pier of Unit 5 of Wanjiazhai Hydropower Station

万家寨水利枢纽位于属温带大陆性季风气候的西北黄土高原区,冬季气温低、持续时间长,每年有4-5个月时间温度处于0℃以下,记录最低气温为-31℃。经多年运行,尾水闸墩水位变化区域混凝土出现不同程度冻融破坏,决定采用UWB水下不分散混凝土进行修复处理。

The Wanjiazhai hydropower station is located in the northwest Loess Plateau with a temperate conti nental mon soon climate. The winter temperature is low and the duration is long. The temperature is below 0℃ for 4-5 months and the minimum temperature is -31℃.After many years of operation, the concrete in the water level change area of tail water sluice pier has suffered d iff ere nt degrees of freeze-thaw damage, and it was decided to use UWB underwater non-dispersed concrete to repair it.