In the heart of the world cultural heritage Badaling Great Wall and the old Beijing-Zhangjiakou Railway, a project that shakes the world is quietly advancing. Located 102 meters underground, the rising Beijing-Zhangjiakou High-speed Railway Great Wall Station connects Beijing and Zhangjiakou. It is not only one of the important transportation facilities for the Beijing Olympic Winter Games in 2020, but also an important part of the Beijing-Pinglan high-speed passenger transportation corridor, connecting the northwest and north China.
The reporter recently walked into the construction site to unveil the underground high-speed rail station that opened up many of the world's most.
The Badaling Great Wall is 102 meters underground and there is a huge change you don’t know
â–³ Great Wall Subway Station Simulation
Standing at the position of the inclined shaft of No. 2 Badaling Tunnel of the China Railway 5th Bureau, you can clearly see the beacon tower of the Badaling Great Wall opposite Shantou. Outside the construction site, a small station on the old Beijing-Zhangjiakou Railway quietly reclined on the hillside. Occasionally, a train with only a few cars passed, slowing down the time.
â–³ Construction of the Beijing High-speed Railway Badaling Great Wall Station
In this silence, there has been a dramatic change that has shocked the world. There is a high-speed railway station with a total length of 470 meters, a underground building area of ​​36,000 square meters, and a rail surface located 102 meters underground.
Why is it so deep?
Experts stated that the site selection of the station is a comprehensive consideration of the needs of serving Yanqing, serving the Winter Olympics, serving the Badaling scenic spot and protecting the Qinglongqiao station and the Badaling Great Wall. The reason why the depth is so deep is to protect the Cheonggye Bridge Station herringbone line.
â–³ High-speed rail station sand table
How do passengers ride?
The high-speed rail station is divided into three levels, the first level from the bottom to the top is the platform level, the second level is the entrance path, and the third level is the exit path and equipment level.
From the ground station, the elevator descended 62 meters to reach the platform floor. This elevation is also the highest in the world.
â–³ passenger transfer
The part of the green light is the passage for passengers entering and exiting the station. It can be seen that the entrance and exit passages of this high-speed rail station are separated.
Can you guarantee safety?
â–³ Red pipe for survival
The red tubular gallery in the picture above is now a construction corridor. In the future, a three-dimensional annular rescue corridor will be formed. Passengers can reach the survival path within 50 meters at any position of the station.
How to change the underground?
â–³ 4 vertical pipes for ventilation shaft
The above figure shows that there are 4 ventilation shafts in the center of the third floor of the station, and fresh air can enter from here.
â–³ ventilation duct
Ventilation during construction is blown into the face of the hand through 4 fans at the inclined wellhead. The large orange-colored pipe at the top of the tunnel in the figure above is the ventilation pipe.
What about earthquakes and other disasters?
Experts told the reporter that the entire tunnel was designed in accordance with the high-level seismic requirements. It is no problem to resist an earthquake with an intensity of 8 degrees.
How many challenges and hardships behind the world's greatest
The face is bigger than the basketball court
From the second inclined shaft down, came to a broad face. This is the largest single-arched tunnel in China with a span of 32.7 meters and a height of 19.5 meters. The entire area is larger than a standard basketball court. The large construction span and the tunnel crossing the Jundu Mountain mean that the terrain is undulating and it is impossible to use shield tunnelling machines. Only the blasting method can be used.
â–³Construction site
Construction site like a maze
The underground construction area of ​​Badaling Great Wall Station is 36,143 square meters. There are a total of 78 various types of caverns in the station. There are as many as 88 types of cross-sections. The cross-nodes are dense, the structure is extremely complex, and the construction is very difficult.
â–³ more cave construction site
Geology will change with construction
At the same time, the Great Wall Station needs to pass through the granitoid strata. There are many types of lithology and large variations in composition, with obvious differences in weathering and very complicated geological conditions.
â–³ granite mountain
Underground traffic scheduling is also a challenge
During the peak construction period, 13 working surfaces are operating at the same time in the forced underground. Only No. 2 deviated wells have 8 sub-channels. Underground logistics, transportation and other organizations are also a challenge.
â–³Construction site
Blasting is difficult
There are world cultural heritage on the ground and the old Beijing-Zhangjiakou Railway. The impact of blasting on the mountain must be strictly controlled during construction. In addition, underground caverns are dense, and blasting cannot cause loosening of surrounding rock and support deformation of adjacent caverns, which is very difficult.
"Without diamonds, we don't use ceramics."
In the course of interviews by reporters, the first time in the world and domestically created these words appeared frequently in the mouth of experts. China's high-speed rail mileage has exceeded 20,000 kilometers, and technology has gradually matured and continued to innovate.
Innovative "product" method
According to experts, the Great Wall Station Tunnel is designed with large spans. If traditional Norwegian law is used, there are many steps and construction time is longer. After thorough study, the experts put forward the “product character†construction method, advance the exploration of geological geology, greatly reduce the excavation of the division, reserve the core to provide support, and the construction method is simple and transformable. It can be used safely and quickly and is also convenient for large machinery. Expand.
â–³ character construction method
Electronic detonation
By using electronic detonators for fine segmentation and detonating one by one, the vibration speed can be controlled within a safe range, and the protection of cultural relics also ensures construction quality. Since the start of construction in March 2016, it has exploded more than 4,500 times and it has been blasted more than a dozen times a day.
â–³Electronic detonator
At present, the overall project has already completed about 40% of the overall project, and the Beijing Zhangjiakou high-speed rail will be completed and opened to traffic before the end of 2019.
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Source: Xinhua Viewpoint (ID: XHSXHSD)
Reporter: Ding Jing Liang Saiyu Li Wen Xie Yu
Editor: Yan Huan
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