The longest and most difficult "hard bones" under the ""!Chengkun -Kun Railway Reunion Line realizes the entire line of tunnels

Kawaguan News reporter Wang Meiling

On June 21, after more than 2,200 days of hard work, the longest tunnel of the Chengkun Railway's energy expansion and renovation project (hereinafter referred to as the "Chengkun Railway Reunion Line"), the Xiaoxiangling Tunnel. The tunnel is nearly 22 kilometers long, and it is also the first long single -hole double -line mountain railway tunnel that has been built in my country.

The Chengkun Railway Reuntelle Line Xiaobailing Tunnel is realized. Photo by Liu Zhongjun

Chengkun Line's geology is complicated and is known as the "World Geological Museum". More than half a century ago, the builders of Lao Chengkun Railway relying on the sledgehammer and shoulder -to -back, creating a miracle in the history of the world railway construction. It is known that the survey designer of the Lao Chengkun Railway has made a 18 -kilometer tunnel plan. The site selection is near the current Xiaosanling Tunnel, but it is trapped in the construction and equipment level at the time. On the paper. Today, under the support of modern construction technology, it has been conceived to become a reality in the past.

With the opening of the Xiaosanling Tunnel, all the tunnels of the Chengkun Railway Line are all connected, and the goals are steadily advanced towards the entire line. After the faster speed and shorter mileage, the Chengkun Railway Reunion Line is completed and opened to traffic. The running time of the Chengkun Line passenger train will be shortened by 12 hours, becoming a "accelerator" for the people along the line.

Too difficult--

The construction encounters the rock -dissolved dark river, and the amount of water flow is equivalent to 15 West Lakes

The Xiaosanling Tunnel is located in Xidis County and Yuexi County, Liangshan Prefecture. It crosses 10 broken layers and 2 folds. The maximum burial depth is 1350 meters. "Hard bone".

Why is the most difficult?

The Chengkun Railway Reproduction Line is more than 860 kilometers in length, and it is implemented in sections and sections. Only the Emei to Mianning section where the Xiaosanling Tunnel is located is under construction. This is also the most difficult and most complicated area of ​​the entire line.

"The difficulty of the construction of the new Sung -Kunkun Railway is in the Emeneu section. Snow Mountain and Da Liangshan and Xiaoshanling Mountains. The area of ​​the tunnel site is long, gully and horizontal. During the construction of the tunnel construction, it is faced with Yongshui, Sand, collapse, activity breaks, fault crushing bands, soft rock deformation, rock explosion, highland temperature, etc. Many engineering geological difficulties are facing great difficulties and challenges.

Water damage is the largest "blockbuster" in the construction of the Xiaosanling Tunnel. "October 7, 2018!" Liu Zhiwei, the head of the Xiaoxiangling Tunnel of the Second Court of China Railway, clearly remembers that on the night of the night, the water of Xiaosanling Tunnel 2 appeared in water, which took 8 months of drainage treatment. The scene was on the spot. The construction has only entered the right track; in less than 1 month, since July 2019, there have been many large -scale surging sands in Pingguodong and positive caves. According to statistics, during the construction of the Xiaosanling Tunnel, the rock -dissolved dark river was encountered.

There are 15 West Lakes in the surging water volume of the Chengkun Railway Reuntelle Line. Photo by Liu Zhongjun

Difficulty in the difficulty

Promote the spirit of Cheng Kun and vigorously carry out technical research

In order to overcome the problem of tunnel construction, it is safe and high -quality to build a new Cheng Chengkun Railway. The Chenggui Railway Corporation is led. More than 30 experts from more than 30 experts from designing, construction, supervision, and consulting units have created the "Railway Tunnel Construction Technology Innovation Studio" The construction of the Kun Railway Tunnel construction technology has summarized the geological changes, grasped the trend and law of changes, found the crux of problem, and promoted the progress of the project in an orderly manner.

Wang Yangyang, a senior engineer of the studio, introduced that in order to overcome the problem of water damage in the Xiaobailing Tunnel, members of the studio repeatedly discussed on -site, determining the principle of "treating the water first, the first drainage of the water, and the drainage of the water first", and the water detection, leaking water, leaking A variety of measures such as water, drainage, and water division have improved the geological conditions of surrounding rocks and greatly reduced the frequency and scale of risks. At the same time, the China Railway Tunnel Bureau adopted large -scale mechanized configuration facilities, improved construction efficacy, quickly opened up the auxiliary construction flat -guided hole, realized drainage and water leakage, greatly improved the construction progress, and ensured that the construction of the Xiaoshanling Tunnel was promoted at high quality.

During the construction, the spirit of Cheng Kun, who was not afraid of difficulties and struggling, shone. In the past, the builders of the Chengkun Railway completed the spirit of "the sacrifice aspirations and dared to teach the sun and the moon to change the new heaven", and completed the mission that foreign experts believed "impossible to complete"; The spirit of water, adhere to dedication, and innovation ", fight the front line, and overcome difficulties. Coincidentally, among the thousands of builders of the China Railway Tunnel Bureau of the Xiaobuxiangling Tunnel, many of the parents and ancestors of many people have also fought the Samura Tunnel -the first long tunnel of Laichengkun Railway.

During the construction of the Xiaosanling Tunnel, every time the water was rushing, the survey designer had to "get out of the scene" to consult the pulse in time and take out the water treatment strategy. On October 31, 2020, the horizontal passage of the 36th passage was out of water, and the bottom of the pit was drowned for about half a meter. The car could not pass through. Liu Zhiwei sat in the fighting machine about 6 kilometers before reaching the water point. Because the bottom of the pits was uneven, it almost fell into the water during the journey. He Yatao, Minister of Engineering of the Nine Standards Projects of the China Railway Tunnel Bureau, said that there are dozens of large and small rock -soluble pipes encountered during construction. On -site operators are wearing raincoats and jumpsuits to excavate operations under the waterfall, and young technicians are under the waterfall. Strict quality acceptance and on -site technical guidance.

The Chengkun Railway Reunion Line Xiaosanling Tunnel penetrated the scene. Photo by Liu Zhongjun

better--

Crossing straight through, the tunnel is longer, but the mileage is shorter

About 30 kilometers on the southeast side of the Xiaosanling Tunnel, is the Samura Tunnel. Under the technical conditions at that time, the length of more than 6,000 meters was already limited. To this day, the excavation length of the Xiaobailing Tunnel has changed by nearly 4 times. The survey designer of the Lao Chengkun Railway and the predecessors of the second hospital of the China Railway have left a draft, similar to the existing Xiaosanling Tunnel. Just stay on the design drawing. Today, with the leapfrog development of China's railway construction technology and construction equipment, this idea has become a reality.

The tunnel is long, but the mileage is short. The area where the Xiaosanling Tunnel is located, from Tiexi Station to Mianshan Station, from the joint point of the new and Laicheng Kun line to the end point, the Lao Chengkun line has a mileage of 145 kilometers and the new line is only 70 kilometers.

Zhang Tao introduced that under the support of modern technology, the Chengkun Railway Reproduction with the basic parallel line with Lao Chengkun Railway, a large -scale interception straight straight along the line, adopting a large radius line to take a straight plan, set up high bridges and long tunnels through the mountains. The gorge, the bridge -tunnel ratio reached 88%, the line length was shortened by 236 kilometers compared to the Laicheng Kun Railway. After the opening of the traffic, the train running from Chengdu to Kunming will shorten 12 hours compared to the old line.

The new steel dragon has successfully crossed the "Geological Museum", and it is expected that the end of this year will be achieved. The Chengdu -Kun Railway Reunion Line will be completed and opened to traffic. It will travel through the hinterland of Liangshan and Panxi, and set up a new steel channel between Sichuan and Yunnan. At that time, the new and old Cheng Kun Line will separate passenger and goods. The Lao Chengkun Line, which is 80 kilometers per hour, is mainly cargo. The Xinchengkun Line, which is 160 kilometers per hour, is mainly passenger. Increasing income will also drive local economic development along the route, consolidate the results of poverty alleviation, and achieve rural revitalization.