Author(s)

Zhongwei Liu, Jinsheng Jia, Chun Zhao, Cuiying Zheng, Zixuan Qiu and Aili Li

Corresponding Author

Zhongwei Liu

ABSTRACT

There are a lot of high dams and giant hydropower stations in China. With the increase of service life, the dam would have some disease-risk conditions inevitably. Generally, emptying the reservoirs is diffcult and the cost is huge. Therefore, underwater repair technology is becoming a trend of development. With the successful application of dam underwater repair technologies in the repair of a large number of reservoir dams such as Fengman, Baiyun, and Wanyao, the underwater dam repair technology in China has greatly improved in terms of construction scale, construction mechanization level and construction technologies. This paper mainly summarizes the application cases of underwater concrete repair technology, types and effects of underwater anti-dispersant, construction methods of underwater concrete, key points for attention and safeguard measures for underwater construction, existing problems and countermeasures, etc. The results show that the underwater concrete repair technology has a remarkable significant effect on solving the dangerous problems of dams, especially in the replacement of underwater concrete, leakage plugging and crack repair.

KEYWORDS

Underwater repair, seepage prevention, patch reinforcement, planting bar, underwater non-dispersive concrete