The dam construction process of Baihetan Hydropower Station has created many records. The seismic parameters of the 300-meter high arch dam rank first in the world. For the first time in the world, low-heat cement concrete has been used for the entire dam of a 300-meter high arch dam. The dam withstands a total water thrust of 16.5 million tons, ranking second in the world. The arch dam is 289 meters high, ranking third in the world.

The dam is the core building of the hydropower project, and it is responsible for the important tasks of retaining water and releasing floods. The dam of Baihetan Hydropower Station is a 300-meter-level concrete super-high double-curvature arch dam. The maximum dam height is 289 meters and the crest arc length is 709 meters. The dam body is arranged with 6 bottom diversion holes, 7 deep flood discharge holes and 6 flood discharges. The surface hole has a complicated structure.

According to data from the Jinsha River Hydrometeorological Center, in 2020, the dam area of Baihetan Hydropower Station will have 251 days of strong winds of level 7 or above, accounting for 70.5% of the year. The climatic conditions where Baihetan Hydropower Station is located have brought many challenges to the concrete pouring of the dam.

"The impact of strong winds is mainly in two aspects, one is the safe operation of the cable crane equipment, and the other is the moisturizing of the concrete." Guo Zengguang, director of the dam project department of the Baihetan Project Construction Department, said, "we have targeted measures for the operation of the cable crane in strong winds. , To ensure the safe operating distance of the cable crane, and at the same time achieve innovative breakthroughs in concrete moisturizing technology to prevent concrete cracking. In addition, the staff of the project department have been on-site duty continuously day and night to ensure the normal progress and construction of concrete pouring. quality."

In addition to the climate, the Baihetan Hydropower Station dam has overcome many worldwide technical problems. The 300-meter ultra-high concrete arch dam has the world's first seismic parameters, which fills in a number of technical gaps in the construction of ultra-high arch dams under complex geological conditions.

The use of low-heat cement concrete for the entire dam of a 300-meter super high arch dam, the use of innovative technology for the first-stage direct-buried high-precision construction of the gate slot, and the safe and efficient operation of seven double-platform cable cranes are the first in the industry. Intelligent construction information management has been established. Platform, to realize the fine management and control of the whole cycle of construction and operation, and the Baihetan Hydropower Station dam has become the most "smart" dam in history.

It is reported that the main concrete of Baihetan Dam is poured with a total volume of 8 million cubic meters, which is divided into 31 dam sections. Since the pouring started, there has not been a single temperature crack, and all the indicators have met the "exquisite project" standards proposed by the Three Gorges Group. In 2019, the dam took out a 25.7-meter long concrete core. The concrete core sample was smooth and compact, with uniform aggregate distribution and few bubbles. A high-quality concrete construction "transcript" was submitted.

In the beginning of 2021, this 300-meter-level concrete super-high double-curvature arch dam launched a sprint towards the top of the whole line. It is expected that the entire dam will be poured to the top in May this year, laying a solid foundation for the first batch of generating units of the world’s largest hydropower project under construction on July 1st. Editor/Wang Jiangwen