Communication: China-Laos Railway Tunnel Construction continues to make Breakthrough
Xinhua News Agency, Luang Prabang, Laos, November 14, by wire: China and Laos continue to make breakthroughs in railway tunnel construction
Xinhua News Agency reporter Zhang Jianhua
"Yes! It's through! We got through again! " On the morning of November 8, there was a cheer at the scene when the No. 1 tunnel of the Kacun Railway, which was constructed by the third Standard and second Division of the China Railway eighth Bureau and third Company, was constructed smoothly. The No. 1 tunnel in Kacun, the China-Laos Railway, was completed 107 days ahead of schedule, and the construction of the tunnel between China and Laos continued to make a breakthrough.
This marks that after the opening of tunnels No. 2, No. 3 and No. 4 of Jika Village, the tunnel group named after "Kacun" of the China-Laos Railway has been fully connected.
Kacun No. 1 Tunnel on the China-Laos Railway, with a total length of 4585 meters, is located on the peninsula on the other side of the Mekong River in Luang Prabang, an ancient city of Laos. The peninsula is a tropical uninhabited or minority area. The China-Laos Railway has no roads in the area passing through the peninsula, and the living and production conditions are difficult.
"No matter how difficult the construction task is, it has to be completed on schedule." Wang Yinzhi, project manager of the China Railway eighth Bureau, said that at the initial stage of entering the venue, he was faced with a "five no" construction environment with no people, no water, no electricity, no roads, no signals, and when poisonous insects and beasts were present, construction and production was faced with great challenges. The project department adhered to the working idea of "crossing the river, opening the road, self-production, self-supply, and crossing the mountain," using vehicles and boats to load construction materials across the Mekong River and build a construction access road about 50 kilometers long across the peninsula. Two sand and gravel production lines and four concrete mixing plants are built to ensure the orderly excavation of Kacun tunnel group.
Kacun No. 1 tunnel belongs to the second-class risk tunnel, which is a high-risk, heavy and difficult control project of the whole railway line between China and Laos. The surrounding rock of the tunnel is weak and broken, the rock strata are complex and changeable, there are many karst sections and two major faults, high geothermal, high stress, easy deformation and collapse; During the construction, water gushing and mud gushing frequently, the tunnel has a reverse slope drainage section of more than 1200 meters, the height difference is 15 meters, when the rainstorm comes, the workers often wade in the water construction.
"if you're afraid of an accident, you won't be safe if you don't go to the construction site." Yuan Rong, project manager, recalled that during the construction period, the maximum water inflow in the construction section of the tunnel exit construction area reached 400 cubic meters per hour, which once led to construction hindrance. The project department adopted high-power pumping equipment for stage relay drainage through the site. Sampling and testing of groundwater can effectively avoid the risks of groundwater softening and erosion of surrounding rock.
Hard work requires skillful work. According to Peng Hebin, chief engineer of the second division, the project department has set up a scientific research group to overcome difficulties, and each process has been strictly checked by managers and supervisors. The project department has made joint efforts with the design and supervision units to ensure the safety, quality and progress of tunnel construction.
It is understood that another long tunnel on the peninsula, Mengcun No. 2 Tunnel, which is responsible for the construction of the China Railway eighth Bureau, is 5874 meters long and is expected to be completed in January next year.
"I must be happy! Many of us haven't been home for two years, and we're all looking forward to going back to the New year early. "Chen Xin, the monitor of the excavation squad, spoke a Sichuan-Chongqing dialect with a smile on his face, and said excitedly," Chen Xin, the monitor of the excavation squad, spoke in a Sichuan-Chongqing dialect. "We are also proud to have won glory for our country when we built the tunnel more than 100 days ahead of schedule in this otherwise uninhabited place!"
"I finally joined up with Manager Zhang!" Lu Hongping, deputy manager of the project production department, said with a smile that he and Zhang Yujun, deputy manager of the project department in charge of tunneling, had an agreement that on the day the tunnel was opened, they must shake hands and take pictures together-this was too important for the two of them who had been fighting in the cave for 952 days. You have to have a sense of ritual.
Since the start of the China-Laos railway, tunnel construction has continued to make breakthroughs. In December 2017, the Wangmencun No. 2 Tunnel of the China Electric Power Construction and Hydropower Bureau was successfully completed, becoming the first tunnel in the whole line of the China-Laos railway project, and the first modern highway and railway traffic tunnel in the history of Laos. The China Railway Fifth Bureau opened the first tunnel of the China-Laos Railway, more than a kilometer, in October 2018, and the first long tunnel of more than five kilometers on the China-Laos Railway in March 2019.
The China-Laos Railway is a strategic docking project initiated by China's "Belt and Road Initiative" and Laos to "change the land-locked country into a land-linked country." from the Laos-China border port Moding in the north to Vientiane, the capital of Laos in the south, the total length of the railway is 414km, including a total of 198km of 76 tunnels. The railway is built with Chinese management standards and technical standards and is designed to travel at a speed of 160 km / h for electrified passenger and cargo mixed transport. The project was fully started in December 2016 and is scheduled to be completed and opened to traffic in December 2021.