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The continuous snow-capped mountains, holy lake water, green grass, running Tibetan antelope… This is the first impression given by the beautiful Tibet. But what people don’t know is that for a long time, the Tibet power grid has been in an isolated grid operation state, the grid structure is weak and the regulation capacity is poor, and when encountering dry seasons, it faces serious power shortage. Power outages are common, and some areas even have no electricity to use.

Tiangzhong Network Engineering is by far the most complex and challenging plateau power transmission and transformation project in the world. The world’s highest altitude 500 kV transmission tower – the 8L196 Tower, known as the “Tower King”, is the largest and most powerful “big brother” in the project, connecting 3,410 surrounding towers together. Its pagoda base is located on Dongdashan Mountain in southern Tibet, with an altitude of 5,295 meters, nearly 100 meters higher than the base camp of Mount Everest. This “China’s height” can be regarded as the peak of world power construction.

The story behind this peak is even more touching.

Power workers are performing spacer installation operations. Photo provided by State Grid

endured altitude sickness, and they worked for more than 500 days and nights. Due to the constraints of the natural environment, economic and social development status, and the cost of power construction, by the beginning of this century, many places in the Tibet Autonomous Region have been using the traditional pine lamp or ghee lamp lighting methods. As soon as he entered Tibet, Zhang Bo, who was then deputy manager of the Power Transmission Construction Branch 4 of Gansu Power Transmission and Transformation Engineering Co., Ltd. and executive deputy manager of the Tibet-China Internet Engineering Package 5 project, was thinking that he must do this project well so that the herdsmen can live a life with electricity.

Zhang Bo is at the construction site. Photo provided by me

“The first challenge we encountered was altitude sickness. The construction site of the 8L196 tower is more than 50 kilometers away from the project department. For every 1 kilometer of the vehicle travels, the average change of the altitude pressure difference reaches 50 meters, and the change of the altitude pressure difference reaches 2,500 meters.” Zhang Bo Yongsheng could not forget the first time the convoy felt when he was on the “Devil’s Highway” of Jueba Mountain: his head was swelling, his chest was stuffy, his heart was squeezed strongly, his lips were purple, and beads of sweat were flowing down his cheeks… Despite constantly sucking oxygen, he still couldn’t breathe. The “buzzing” roar sounded around the ears, and even if he spoke face to face, it was difficult to hear the sound.

If you only stay for a few days, you can still bear it. But 50,000Many builders of China National Electric Power have worked here for more than 500 days and nights!

The decisive battle against some of the builders of the 8L1Babaylan96 Tower. Photo provided by State Grid

Every morning, young commandos carry dry food and instruments weighing about 10 kilograms, and rushed to the construction site of Dongdashan Pass to investigate the foundations of towers under construction. In order to inhale a little more oxygen, they endured chapped lips and sore throat and breathed with both mouth and nose. In order to save their physical strength, they climbed up with their hands and feet, and their arms and knees were damaged. Zhang Bo joked, “We’re four-wheel drive!”

The higher they climbed, the steeper the slope. In some places, the slope was even close to 90 degrees, and there were gravels that kept rolling down under their feet. A slightly larger movement would cause people to feel strong physical discomfort. Safety officer Xiao Lei recalled the thrilling scene of hypoxia due to altitude sickness. Once, the temperature in Dongdashan was as low as tens of degrees below zero. A comrade was working on the tower. He suddenly felt dizzy and lost consciousness with his hands, so he was ready to get down as soon as possible. However, during the process of getting off the tower, he failed to catch it due to lack of oxygen. When he was still 2 meters away from the ground, he fainted and fell down! “At that time, I was in front of the tower and hugged him and quickly inhale oxygen. My hands were frozen and could not be roasted with fire, so I could only warm his handbag with a cotton coat. After a few minutes, the descendants woke up and slowly took off their gloves and rubbed their fingers to feel it.” Shi Xiaolei once had altitude trembling with his arms, a blue face, and a breathless altitude sickness at an altitude of 4,700 meters. Everyone advised him to return to Lanzhou, but he insisted on staying. He said, “I am the first batch of Tibet personnel in our project, so how can I leave at will!”

Shi Xiaolei was at the construction site. Photo provided by me

Hail clattered on the safety helmet, and each bolt was tightened in my hand.

If altitude sickness can be adapted slowly, then the extremely harsh weather and fragile ecological environment are a bigger “stumbling block” that hinders the progress of the project.

“A mountain has four seasonsBabaylan, ten miles and different skys.” The terrain and landforms along the Tibet-China Internet Project are complex and diverse, with a changing climate and effective year.The construction period is only 6 months. The project crosses the core area of ​​the Hengduan Mountains and the hinterland of the Qinghai-Tibet Plateau, and is located in the “Three Rivers” fault zone with the most complex geological structure and the widest distribution of geological disasters in the world. Among them, Dongdashan is located in the watershed between the Lancang River and Nujiang River. The air pressure is very unstable, and blizzards, hail and strong winds often come without warning.

Dongta Mountain in the Snow. Photo provided by State Grid “It’s different from in plain areas where it rains and hails. I usually dig holes and do it all morning, and I have to change people in half an hour in Dongdashan. The work efficiency is too low.” Zhang Bo said.

Before departure, the project team held a meeting to prepare a customized version of the “Single-Based Construction Plan” in response to the special circumstances of the high altitude of the Tibet-China Internet Project. But they actually arrived at the construction site and found that the project was much more difficult than they thought. Under the vegetation of Dongdashan, there is hard granite. In order to avoid damage to the vegetation, they can only give up advanced mechanical equipment and use primitive manual excavation to excavate the foundation pit. At first they could dig 0.5 meters a day, but when they dig more than 3 meters, a large amount of water gushed out from the foundation pit dominated by weakly weathered rock layers and granite. In addition, the rock layer became harder, so they could only dig 10 cm a day.

One 10 cm, and the other 10 cm… The project department continuously organized special seminars to adjust the construction plan. At this “commandering height”, they worked overtime to dig 4 foundation pits more than 10 meters deep!

Foundation pit. Photo provided by State Grid

On the night of May 7, 2017, just as everyone returned to the station with joy after finishing the foundation for replenishment, a blizzard suddenly hit and the temperature dropped sharply to minus 17 degrees Celsius. The sudden cooling will affect the strength of cast-in-place reinforced concrete, and the insulation work of tower foundations is urgent!

The strong wind swept over with hail in an instant, hail the size of a pigeon egg hit the safety helmet, and the cotton coat was instantly soaked. The hail in the sky turned into dense snowflakes again, and the mist, snowflakes and cold wind mixed together, turning into a vast white patch of night. On this night when the young commandos were out of sight, they stepped on the dark slime stones covered by snow and climbed up the construction site of the top of Dongda Mountain with blizzards. The team members who were trembling with cold set up insulation tents for the tower foundation and raised coal stoves. The temperature in the tent slowly rose. Everyone kept the tower foundation like a child who cared for their own children and guarded it until dawn.

Although they were exhausted, everyone really felt the warmth and happiness of the sun when they saw the sun rise. Afterwards, the project chief engineer Zhang Yijun wrote on the “Qingmushi”: “Looking back, on Dongda Mountain, at an altitude of 5,295 meters, the deep footprints on the snowy night are actually me.The coolest selfies and perfect life! ”

The “coolest selfie” in a snowy night. Photo provided by State Grid

In order to allow the public to use power, the “loss business” must also be done

Because the construction environment is complex, each base tower material of the Tibet-China Internet Engineering is specially customized and needs to be transported from Shandong, Guangdong, Hubei, Zhejiang and other places thousands of miles away.

In order to ensure the safety of vehicles and personnel, the Tibet-China Internet Engineering Department has set up four checkpoints and medical points along the way, and will only be released after confirming that the status of vehicles and personnel is normal. Rumei Checkpoint is the busiest one. Not long after we set off here, we arrived at the Juebashan Highway at an altitude of 3,940 meters. Along the highway, there are cliffs and rushing Lancang River below. There are neither guardrails nor road signs, and it is common to encounter rockfalls or landslides. The most difficult thing is to pass the “72nd turn” of the Nujiang River on the Sichuan-Tibet Line, because the tower materials are longer and the transportation vehicles are larger, Once these fast and steep U-shaped bends encounter a car coming from the opposite side, the master who transports tower materials must stop first and let the other party pass before going back on the road.

The “72nd Turn” of Nujiang, known as “one of the most dangerous highways in the world”, is called “72nd Turn” of the Sichuan-Tibet Line, Nujiang, known as “one of the most dangerous roads in the world”. Picture source: CCTV.com

Most of the “last mile” of tower materials transportation is mostly too slow and not suitable for cableways. The mule and horse team who have been walking on the ancient tea and horse road in Yunnan for a long time will be “invited” by the builders. If transported by car, the tower materials can be transported to the construction office in one day, but the mule and horse team will take three to five days, and the transportation cost is 10 times that of car transportation. Why do they have to do such a loss-making business? Fang Renting, an employee of the State Grid Tibet Power Transmission and Transmission Company, explained, “As long as you can get CinemaThe transportation cost is high, and that is worth it! “

Even when mules and horses couldn’t even provide physical strength. Shi Xiaolei recalled, “When the grounding and guidance of the 8L196 tower was grounded and pulled down the line, it was necessary to transport a generator weighing about 120 kilograms. We specially picked a very strong horse. Unexpectedly, at an altitude of 5,200 meters, the horse suddenly foamed at the mouth and could no longer climb. In this harsh environment, the horse’s physical strength could not reach the level of the plain. The last 95 meters were lifted up in turn. ”

On July 10, 2017, the tower formation entered the final stage of attack. The youth commando team once again climbed the tower with oxygen cylinders on their backs, firmly tightening the last arm of the “Tower King” to the torso of the tower. When the last bolt was tightened and the last high-altitude operator came down safely, the “Tower King” with a total weight of 55 tons and a height of 58.5 meters was finally built.

“The world’s highest altitude 500 kV transmission tower was born by your hands! “The commander-in-chief announced this excitementWhen the news came from the hearts of the people, “We succeeded, we won!” Everyone present cheered and hugged each other tightly, tears of joy flowed freely.

The builders took a photo in front of the “Tao King”. Photo provided by State Grid

After the establishment of the tower foundation, Zhang Bo was deeply moved: “After two years of generator life, Rumei Town is about to be powered on, it can be said that ‘the electricians will bring the light wherever they go’. Maybe in the future, they will travel on the Sichuan-Tibet Line, and you will truly feel the light you bring! This light is a gift we give to the Tibetan mothers! Komiks“

Zhang Bo’s circle of friends. Photo provided by me

When the founding of New China in 1949, the national installed capacity was only 1.85 million kilowatts, which was only equivalent to the current two units. Before the reform and opening up, 330 kV was the highest voltage level of the power grid. Today, my country has the highest voltage level of ±1100 kV DC transmission and 1000 kV ultra-high voltage AC transmission lines in the world. Compared with the founding of New China, my country’s power generation increased by more than 2,000 times. At present, the average annual household electricity consumption in the country is about 695 kilowatt-hours, and the electricity consumption problem of the population without electricity has been solved.

Whether the mountain canyons or snowy plateaus, the “electric power sky roads” have given the wings of taking off for economic and social development. Whenever the lights on the snowy plateau are on at night, the transmission lines are running steadily, and generators are roaring thousands of miles away. That is the most magnificent sound of the forging China. (China Youth Network reporter Yang Yue Yang Weiqiong Intern reporter Cao Ruohong)