To put it bluntly, China's infrastructure technology is the strongest in the world, after all, the mainland has single-handedly created many "miracle" projects, such as the Three Gorges Dam, the Hong Kong-Zhuhai-Macao Bridge, etc., in addition, we also have the world's highest extra-long tunnel, the world's longest lake tunnel and other infrastructure, and these are the most powerful proof of the mainland's infrastructure strength.
It stands to reason that if you want to build a tunnel with the infrastructure technology mastered by the mainland, it is absolutely hand-to-hand and can be built successfully without spending too much time, but there is a tunnel in China called China's "devil" tunnel, and the construction period once changed from 5 years to 8 years, and then it was delayed to 13 years before it was successfully built! Do you know what this tunnel is called?
I believe many people have guessed that this tunnel is the Dazhushan Tunnel, its construction is mainly to strengthen the connection between the east and west of Yunnan, open up the passage between the southwest of the mainland and Southeast Asia, because of the great significance, the mainland decided to build a railway from Dali to Ruili, however, this railway needs to pass through the Hengduan Mountains, so a tunnel must be dug through.
According to the data, Dazhushan started construction in 2008, and the initial construction period was set at 5 years, but because the difficulty of the project construction was too high, the construction period was later changed to 8 years, I thought that the time was enough, but I never thought that this was still not enough, and in the end, it took 13 years for the mainland to build it successfully, and it is also known as "the world's most difficult tunnel".
It is understood that the mainland has invested 280 billion yuan in the construction of this tunnel, do you know what this concept is? You must know that Kunming, Yunnan Province's annual finance is only 63 billion yuan, and the investment in the project is as much as 4 times that of the finance, which is enough to show how difficult it is to build this tunnel!
Why is the Dazhushan Tunnel so difficult to build? There are many reasons, first of all, this tunnel is located in the Hengduan Mountains, the geological conditions in the area are very complex, everywhere is densely covered with dark rivers, karst caves, crustal fault zones, and secondly, the water system here is very developed, workers often encounter water permeability, mud inrush and other phenomena during construction, which will cause life danger if not careful, and finally the temperature in the tunnel is extremely high, and the workers have to work at a high temperature of more than 40 degrees, which is a huge challenge to the human body and willpower.
It is reported that when the project was at its most difficult, the workers dug for 26 months to complete the task with a short 156-meter schedule, and the amount of water gushing out here during the construction process could fill 10 West Lakes.
What is proud is that although the construction of the Dazhushan Tunnel is very difficult, the workers did not give up, and finally it took 13 years to complete the construction of the tunnel in April 2020 in the mainland, and announced the opening of the whole line, and now, it takes only 7 minutes to cross the 14.5-kilometer Dazhushan by train, which is very convenient. Finally, I would like to say that the successful construction of this tunnel is inseparable from the efforts of the infrastructure projects, so we should regard them as idols, and they deserve the respect of each and every one of us. Is there anything you would like to say about this?