What is the sign that No.2 inclined shaft of Yiliang Tunnel of Chongqing-Kunming high-speed railway enters the main tunnel? Anything else?

On September 13, the construction of Kunming-Chongqing High-speed Railway Line 2 officially started. The official technology of this tunnel is that it will form the longest tunnel in the world. It will also promote the construction of some projects in Yunnan-Guizhou area, so that these projects will enter the stage of comprehensive promotion. This high-speed rail line is built in the mode of full-line control, and it is also the longest tunnel in the world, and its speed is set at 450 kilometers per hour. It belongs to a double-track tunnel, and the two openings are built separately. The length of the left and right tunnels is more than 24 kilometers.

The tunnel was built in two counties in Yunnan. As we all know, the landform of Yunnan is very rugged. Yunnan is full of mountains and dense vegetation. And there are many canyons here, and the depth of the canyons is very long, and some can reach more than 900 meters at the highest. For the topography of Yunnan, as long as it rains, mudslides and landslides are prone to occur, and Yunnan is also an earthquake plate, which is prone to earthquakes. Moreover, Yunnan's landform belongs to soft rock, and the ground temperature in Yunnan is also very high. This is also very difficult for tunnel construction, and many unfavorable factors will also lead to the progress of the construction team. But in order to complete the tunnel in the expected time, will it be used in the later construction? 2+2+2? Tunnel construction model.

For such a difficult construction process, the construction team has been facing many problems in the construction process. The construction team also carried out some simulation schemes for these problems, and made innovations in the process, applying the latest technology to the construction of this tunnel. Moreover, in order to speed up the construction, the local transportation department also sent many mechanized machines to blast the difficult areas in the tunnel, which can ensure the overall construction quality and the safety of construction workers.

After the completion of this railway, it will promote the economic development of relevant areas in the western region and open a new pattern in the western region. The formation of the economic circle between the two regions can further improve the national transportation network, enhance the mass communication between the two regions, and ensure the travel quality of the people in the two regions.