The world's most difficult super project, the Sichuan-Tibet Railway running through the Hengduan Mountains, allowing the train to go to the top of the world
In China, there is such a road, which is hailed as a miracle by the West and the whole world. At the beginning of its construction, almost everyone thought that building such a road was comparable to reaching the sky, but China relied on extraordinary perseverance to successfully complete the Western What I think is impossible, this road is the Sichuan-Tibet Railway with an investment of 319.8 billion yuan, which is a real super project! So why does China have to build such a railway, and how difficult is it to build?
The Sichuan-Tibet Railway is a high-speed railway connecting Sichuan and the Tibet Autonomous Region in China. It starts from Chengdu, Sichuan in the east and ends in Lhasa, Tibet in the west. The whole line runs from east to west. An important railway line in southwest China, the Sichuan-Tibet Railway is mainly divided into three phases, namely the Chengdu-Ya'an section, the Lhasa-Nyingchi section, and the Ya'an-Nyingchi section, with a total length of more than 1,700 kilometers. Previously, the Lalin and Chengya sections were It has been opened to traffic one after another, and the Yalin section is still under construction.
The picture shows the Sichuan-Tibet Railway
As China's second railway entering Tibet, the Sichuan-Tibet Railway not only needs to pass through the western edge of the Sichuan Basin, but also through the entire Hengduan Mountains, through the collision zone between the Asian plate and the Indian Ocean plate. Only seven rivers and eight snow-capped mountains can reach the final destination of the Sichuan-Tibet Railway, Lhasa. The extremely complex terrain makes it very difficult to build such a railway.
The picture shows the Sichuan-Tibet Railway under construction
The first test to be faced in the construction of the Sichuan-Tibet Railway is the huge terrain height difference along the line. When driving out of the Western Sichuan Canyon and the Western Sichuan Plateau and entering the Hengduan Mountains, the altitude climbed from more than 600 meters to more than 2,700 meters. Under such a huge drop Traveling through is even more exciting than riding a roller coaster. In the face of such difficulties, the relevant construction personnel adopted a Z-shaped construction method according to the trend of the mountains and rivers along the line, so that the rails could circle up the mountain, and at the same time, in order not to consume a lot of financial resources In addition to manpower, the Sichuan-Tibet Railway also avoided crawling around the mountains as much as possible during its construction, and instead chose to build bridges and dig tunnels. The terrain problem faced was successfully resolved.
After the first problem has been solved perfectly, the construction of the Sichuan-Tibet Railway is faced with more difficult challenges. Due to the high altitude of the Qinghai-Tibet Plateau and the low temperature all year round, there are permafrost layers in some areas where the line passes. The thawing of the frozen soil will cause the road to collapse and damage the rails. In order to solve this problem, the relevant construction personnel use the thermal pile subgrade structure, which uses sealed iron rods with heat-dissipating substances such as ammonia freon inserted on both sides of the road. The rapid heat distribution of the permafrost layer has greatly ensured the safe passage of trains.
The picture shows the radiator of the Sichuan-Tibet Railway
Since the construction of the Sichuan-Tibet Railway needs to face so many difficulties, what is the significance of building this railway in China? With the economic development of Tibet, when the entire railway line is successfully opened to traffic, the time from other cities in China to Tibet will be greatly shortened. At the same time, this will also speed up the efficiency of the export of mineral resources in Tibet, which will not only effectively solve the employment problem, but also It can also improve people's travel, and more importantly, the completion of the Sichuan-Tibet Railway can further strengthen the exchanges and integration between various ethnic groups. Therefore, although the construction of the Sichuan-Tibet Railway is very difficult, it is of great significance to the rise and development of western China.