Twenty-three years of "intersection" with the dam witnessed the transformation of hydropower in China from shoulder to shoulder to intelligence.

How can millions of cubic meters of concrete be "combined" without cracks? What kind of sparks will concrete pouring collide with Internet of Things and cloud computing technology?

Zhao Xian 'an, deputy general manager of Three Gorges Construction Company of China Nengjian Gezhouba (600068) Group, gave the answer.

At the age of 22, he participated in the construction of the Three Gorges Project. At the age of 29, he moved to Xiangjiaba Hydropower Station. At the age of 35, he was ordered to go to hydropower projects in Cambodia. At the age of 39, he participated in the construction of Wudongde Project. In the past 23 years, Zhao Xian 'an has "intersected" with the dam and "accompanied" with the concrete, and has grown from a grassroots concreter to a senior technician, becoming a national model worker, giving concrete pouring a full scientific and technological paradigm, and witnessing the hydropower project in China moving from the initial shoulder-lifting person to the intelligent age.

"Grassroots units can also make a difference."

To build a hydropower station, we must first build a dam. From 65438 to 0999, the second phase of the Three Gorges Project ushered in the first peak year of concrete construction. According to the plan, in the second phase of construction, the Three Gorges Dam will be poured on the main riverbed of the Yangtze River, and metal structures and hydro-generator sets will be installed to form the Three Gorges Reservoir, so that the reservoir will be filled to the elevation of 1.35 meters, the first batch of generators will generate electricity, and the permanent ship lock will be navigable? This year, 22-year-old Zhao Xian 'an joined the Three Gorges Project as a temporary worker and was assigned to the concrete pouring team.

Compared with welders, the foundry at that time was not a hot job, and there was not much technical content. He has to wear sultry overshoes every day, and ash and mud stick to him for a long time. A vibrator weighs more than 20 kilograms or even more than 50 kilograms, which is bitter and tired. In Zhao Xian 'an's memory, only 10 new workers were recruited after three months.

Zhao Xian 'an is one of the left-behind workers. In fact, before joining the Three Gorges Project, Zhao Xian 'an, who graduated from technical secondary school, had given up his assigned job as a builder of Yichang Construction Corporation and went out to travel. When he returned to the construction site as a pouring worker, it not only meant facing a strange field, but also meant moving from a management position to a grass-roots worker position. But after two years of social training, Zhao Xianan felt that he would stay. "Down-to-earth, with hard work, the grassroots can also make a difference!"

After three months as a monitor and six months as a vice-captain, Zhao Xian 'an began his career "miracle". Facing the pouring of RCC cofferdam in the third phase of the Three Gorges Project, which challenges the construction strength of the world, Zhao Xian 'an and his team set a record of pouring 165438+ 1 100 million cubic meters of concrete in just five months. At that time, it was generally believed that "no dam can crack", but there was no crack in the 165438+ million cubic meters of concrete poured by him and his team. At Xiangjiaba construction site, Zhao Xian 'an led the team to create the construction record of the maximum annual increment of left bank dam pouring108m, and took out a complete high-quality RCC core wall with a world-class length of18.57m..

"I used to work day and night for more than three months."

Zhao Xian 'an's success is also the side of two landmark hydropower projects constantly refreshing the world record. The Three Gorges Hydropower Station is by far the largest hydropower station in the world. China Nengjian Gezhouba Group undertook 65% of the engineering quantity, and successively created 1 12 world-class inventions, 934 invention patents and 135 quality standards for the Three Gorges Project. After Xiangjiaba Hydropower Station is completed, ships from Shuifu Port in Yunnan Province, which is known as the "first port of the Yangtze River", can reach Shanghai directly.

However, there are countless difficulties behind the "high gorge out of Pinghu". At that time, there were many "stubborn diseases" such as honeycomb, pockmarked surface, curtain hanging and slurry leakage in concrete pouring, but Zhao Xianan, who had the belief of "pursuing the perfection of quality and technology with his heart", was determined to overcome these problems. "In summer, it doesn't matter if people get wet in the rain, but the concrete has to be covered. In winter, like a baby wearing clothes, the corners of concrete should also be covered with thermos cups to control the temperature. " In the end, Zhao Xian 'an summed up a series of operation methods to build fine concrete products, such as "five controls, five aging" and "32-word tips".

The geological conditions of Xiangjiaba project are very complicated, and the key period of the project is hot and rainy summer. Due to the large amount of water seepage in the foundation pit, the excavation site is extremely narrow, and the construction layout, drainage and slag discharge of the foundation pit are very difficult, so the construction is facing great difficulties. Whether the bad geological body of the left bank dam built by Gezhouba Group can be completed on schedule directly determines whether the closure target of Xiangjiaba Project in 2008 can be achieved on schedule.

Zhao Xian 'an said that he worked day and night for more than three months. Whenever it rains, he will go to the scene. It kept raining, but he couldn't stop. Workers must be quickly organized to cover tarpaulins and prevent concrete phosphorus and drainage. "It was simply a battle."

"The Wudongde Dam is like a work of art."

"If you want to do something, there must be a thousand reasons." With this resilience, Zhao Xianan braved the wind and waves in his career. At the age of 39, he won the National May 1st Labor Medal. Also in this year, China Nengjian Gezhouba Group established a model worker studio named after Zhao Xian 'an in wudongde hydropower station.

Wudongde hydropower station is the fourth 10 MW giant hydropower project in China and the seventh in the world. The contract blocks successively undertaken by Three Gorges Construction Company of China Gezhouba Group account for about 75% of the main construction tasks.

As soon as Zhao Xian 'an returned to China after completing the hydropower project in Cambodia, he received a new task of participating in the construction of Wudongde Dam. However, the difficulties are endless. In front of this "soil expert", there are many winds, strong sunshine, large evaporation and large temperature difference between day and night in the dry-hot valley area of Jinsha River, so it is difficult to prevent cracks by building dams with ordinary medium-hot cement. Concrete pouring is the last step of all construction projects. "Once the defect is irreparable and cracks appear after pouring, there will still be cracks after taking any remedial measures. Even if the function is temporarily unaffected, there will still be problems in a few years. "

However, Zhao Xian 'an, who has a studio, firmly believes that not paying attention to concrete pouring with advanced technology should also be "technology first". Learning in practice and gnawing at expert papers, he and his team plunged into the topic and used platform resources to open up new battlefields again.

Today, the Wudongde Dam, which stands proudly in the turbulent Jinsha River landscape, is the thinnest 300-meter super-high arch dam in the world and the first super-high arch dam with low-heat cement concrete pouring. The height of the whole dam is 270 meters, the bottom thickness is 5 1 m, the arc length of the upstream surface of the dam crest is 326.95 meters, and the thickness-height ratio is only 0. 19. It is conceivable that a curved eggshell is gently stuck in the V-shaped valley of Jinsha River.

"The Wudongde Dam is like a work of art. It is not' piled' with concrete in the traditional sense, but a water retaining structure designed completely according to the terrain, using the most cutting-edge technology." Zhao Xian 'an's words are full of excitement and pride. According to him, Wudongde Dam applied low-heat cement to the whole dam for the first time, and applied many innovative technologies such as intelligent grouting, intelligent vibrating, intelligent temperature control, automatic formwork climbing, and uncovered consolidation grouting of the whole dam to create a truly seamless hyperbolic arch dam and a truly mirrored concrete cavern.

Witness China hydropower from shoulder to shoulder to intelligence.

Zhao Xian 'an is a native of Yichang, Hubei Province, where the Gezhouba Water Control Project, the first dam of the Yangtze River, is located. As a child, Zhao Xian 'an witnessed his parents' participation in the construction of Gezhouba. As an adult, Zhao Xian 'an invested in three landmark hydropower projects for more than 20 years. It can be said that Zhao Xian 'an's career development is in the same frequency as China's hydropower development history.

In his view, Gezhouba is the initial stage of hydropower industry, which more embodies the spirit that people can conquer nature and shoulder to shoulder. After entering the Three Gorges Project, China hydropower seeks standardization and pays attention to refinement. "It can be said that the strict attitude of the Three Gorges Project to quality tempered a group of hydropower people later." Xiangjiaba project means diversification and contact with RCC. Wudongde dam has more obvious characteristics of modernization and is moving towards intelligence.

Zhao Xianan gave an example. In the past, it was entirely up to people's conscience whether the interior of concrete works was dense and safe. But now, with intelligent vibration equipment, we can clearly see where there are loopholes or need to rework through satellite images.

Today, Zhao Xian 'an has invested in Wuzhong Expressway project, and his department is mainly responsible for the construction and operation of all precast beam factories and steel bar factories in the project.

He said that he is studying the construction of an intelligent beam factory to realize a fully intelligent precast beam production line and provide high-quality precast beams. "We must truly integrate the positioning system, visualization system and material system into the construction of Changliang, and do a good job in this piece, so that we can build China at the forefront of science and technology and liberate the labor force to the greatest extent." Zhao Xianan said.