Xinhua News Agency: China Laos railway tunnel construction continues to make breakthroughs

"Yes! All right! We're through again! " In the early morning of November 8, the No.1 Tunnel in Kacun of China Laos railway, which was constructed by the No.3 bid No.2 Branch of China Railway No.3 Engineering Group Co., Ltd., was successfully completed, and there was a burst of cheers on the scene. The No. 1 Tunnel in Kacun of China Laos railway was completed 107 days ahead of the original plan, and the construction of the tunnel continued to make breakthroughs

this marks the completion of all the tunnels named "Kacun" in China Laos railway after the completion of No.2, No.3 and No.4 tunnels in Kacun The No.1 Tunnel of

China Laos railway, with a total length of 4585 meters, is located on the peninsula across the Mekong River in the Lao ancient city of Luang Prabang, which is a tropical unmanned area or a small population area. There is no highway in the area where the China Laos railway passes through the peninsula, so the living and production conditions are hard

"no matter how difficult the construction task is, it should also be completed on time." Wang Yinzhi, manager of China Laos Railway Project Department of China Railway No.8 Engineering Group Co., Ltd., said that in the early stage of mobilization, the construction environment of "five no's" is faced with no one, no water, no electricity, no road and no signal, and the construction and production are faced with many challenges due to the time of poisonous insects and beasts. The project department adheres to the working idea of "river crossing, open road, self production, self supply and mountain crossing", uses vehicles and ships to load construction materials to cross the Mekong River, builds a construction access road about 50 kilometers across the peninsula, and builds two sand and stone production lines and four concrete mixing stations to ensure the orderly tunneling of the Kacun tunnel group The No. 1 Tunnel of

Kacun is a secondary risk tunnel, which is a high-risk, key and difficult control project of the whole line of China Laos railway. The surrounding rock of the tunnel is weak and broken, the rock stratum is complex and changeable, there are many karst sections and two major faults, high temperature and high stress, which are easy to deform and collapse; during the construction, there are frequent water inrush and mud inrush, and the tunnel has more than 1200 meters of anti slope drainage section, with a height difference of 15 meters. When the rainstorm comes, the workers often go for water construction

"I'm afraid of accidents. I'm not sure if I don't go to the construction site." Yuan Rong, the project manager, recalled that during the construction period, the maximum water inflow of the construction section at the exit of the tunnel reached 400 cubic meters per hour, which once led to construction obstruction. The project department effectively avoided the risk of softening and erosion of the surrounding rock caused by the groundwater by adopting the high-power pumping equipment to discharge the water in sections and relay, sampling and testing the groundwater

hard work also requires skill. According to Peng Hebin, chief engineer of the second division project, the project department has set up a scientific research team to overcome difficulties, and each process has been strictly checked by management personnel and supervisors. The project department, design and supervision units work together to ensure the safety, quality and progress of tunnel construction

it is understood that Mengcun No.2 tunnel, another long tunnel on the peninsula under the construction of China Railway No.8 Engineering Group Co., Ltd., has a total length of 5874 meters and is expected to be completed in January next year

"must be happy! Many of us haven't been home for two years, and we are all looking forward to finishing the work early and going back to the Spring Festival. "Chen Xin, the head of the excavation team, speaks Sichuan and Chongqing dialect, smiles and excitedly says," we are proud to build the tunnel more than 100 days ahead of time in this originally desolate place, and win honor for our country! "

"I finally met manager Zhang successfully!" Lu Hongping, deputy manager of the project production department, said with a smile that he had an agreement with Zhang Yujun, deputy manager of the project department in charge of Xiang tunnelling. On the day when the tunnel is completed, they must shake hands and take photos at the junction - it's too important for them to fight for 952 days in the tunnel, and they must have a sense of ceremony Since the construction of

China Laos railway started, the tunnel construction has made continuous breakthrough. In December 2017, the No.2 tunnel of wangmen village of China Laos railway contracted by China Power Construction and Hydropower Bureau 15 was successfully completed, becoming the first tunnel through the whole line of China Laos railway project and the first modern highway and railway traffic tunnel in Laos history; in October 2018, China Railway Bureau 5 passed through the No.1 Tunnel of Nadui, the first tunnel over one kilometer of China Laos railway, and the China Laos railway in March 2019 The first long tunnel over 5 km long

China Laos railway is a strategic docking project between China's "belt and road" initiative and Laos's "transforming land locked country into land linked country". It starts from boten, the Laos China border port, in the north, and ends in Vientiane, the capital of Laos, with a total length of 414 kilometers, including 76 tunnels with a total length of 198 kilometers. The railway is constructed in accordance with Chinese management standards and technical standards, with a design speed of 160km / h. It is an electrified mixed passenger and freight railway. The project was fully started in December 2016 and is planned to be completed and opened to traffic in December 2021.