Ningzhi peach blossoms bloom in the snowy "Jiangnan". Zhang Jingshe
Before and after the Ching Ming Festival, peach blossoms bloom in full bloom, and a train travels through the sea of flowers ... when the "train to spring" meets the snowy plateau "drunken Linzhi", what kind of human story?
Electrified construction was carried out on the Lalin section of the Sichuan-Tibet Railway. Photo by Wang Baocheng
On April 7, the last tunnel from the Lhasa to Nyingchi section of the Sichuan-Tibet Railway ("Lalin Railway" for short) was opened, furthering the vision of enjoying the peach blossoms by train in 2021.
Peach blossoms in Nyingchi Bomi Peach Valley are in full bloom. Photo by He Penglei
Peach blossoms bloom in Linzhigala Peach Blossom Village. Zhang Jingshe
Tourists enjoy watching flowers at the Peach Blossom Village in Linzhi Gala. Photo by He Penglei
Tourists enjoy watching flowers at the Peach Blossom Village in Linzhi Gala. Photo by He Penglei
The first electrified railway in the snowy plateau brings Tibet closer to you
Electrified construction was carried out on the Lalin section of the Sichuan-Tibet Railway. Photo by Wang Baocheng
"The first electrified railway for Tibet means that high-speed trains with a speed of 160 kilometers per hour can run on the snowy plateau."
According to Liu Hao, the deputy manager of the project manager of the Lalin Railway Fourth Electric Power Engineering Project Group (referred to as "Lalin Railway Fourth Electric Power Engineering Project Department") of China Railway Electrification Bureau Group, compared with diesel locomotives, Electric locomotives are more environmentally friendly while increasing speed and capacity.
Lalin high-grade highway. Photo by He Penglei
It is reported that the opening of the Lalin high-level highway will shorten the distance of more than 400 kilometers from Lhasa to Nyingchi to 4 hours, and the opening of the Lalin Railway will be reduced to less than 3 hours, which will further promote exchanges and coordinated development between the two places.
National Highway 318 is called "China's most beautiful highway", and the 16th crossing of the Yarlung Zangbo River, along the Lalin Railway, which can enjoy the Huahai and Linhai, will become a scenic avenue.
Lalin Railway in paving. Photo by He Penglei
In addition, the tunnel penetration of the Lalin Railway also means that the Sichuan-Tibet Railway's Ya'an to Linzhi section, which is very similar to the natural environment, geological conditions and construction difficulties, is also not far away. Many mature constructions have been verified in the Lalin Railway construction Technical and management experience can speed up the progress of subsequent projects.
Passengers took the Qinghai-Tibet Railway train to Lhasa. Photo by He Penglei
After the Sichuan-Tibet Railway is opened to traffic, the operating time of the railway from Chengdu to Lhasa is expected to be shortened from the current 36 hours to 13 hours, becoming the main channel for passenger and freight transportation between Tibet and Sichuan, Chongqing, Central China, and East China. The spatial and developmental distance between Tibet and the interior will also narrow the psychological distance between each other. "Tibet will not be mailed" will become history.
The picture shows that on the National Highway 109, trucks entering Tibet are crossing the Tanggula Pass at an altitude of nearly 5,200 meters. Photo courtesy of Public Security Bureau of Anduo County, Tibet
By then, the regional railway network structure will be further improved, the transportation infrastructure conditions along the route will be improved, and the transformation of local resource advantages into economic advantages will be of great significance to the promotion of Tibet ’s economic and social development, national unity, and national defense transportation support capabilities.
In recent years, the transportation infrastructure conditions in Tibet have continued to improve. Photo by He Penglei
"Tianlu" 2.0 Chinese engineering personnel create a miracle in the plateau
Under the fragile ecological environment of snowy Tibet, the snowy "Tianlu" 2.0, which has been built by railroad tracks over the past five years, is an advanced road for Tibet engineering technology.
Lalin Railway in paving. Photo by Zhao Lang
More than 90% of the Lhasa-Ningzhi section of the Sichuan-Tibet Railway under construction is located in a plateau area above 3000 meters above sea level. It is cold and hypoxic, with inconvenient transportation, poor natural conditions, and unusually complex geology. 14 of the 47 tunnels on the entire line are high-risk tunnels Among them, 7 of them are extremely high-risk tunnels, with the longest tunnel Dagala having a total length of 17.31 kilometers.
On the 7th, the key control project of the Lalin Railway, the Milin Tunnel, was successfully opened. Photo by He Penglei
On the 7th, the key control project of the Lalin Railway, the Milin Tunnel, was successfully opened, and the Zangga Tunnel was opened on the same day. So far, the 47 216.5-kilometer tunnels on the entire Lalin section of the Sichuan-Tibet Railway have been completed.
The Milin Tunnel, located in Milin County, Nyingchi City, is one of the six 10,000-meter long tunnels with the most difficult construction on the entire line. The average altitude is 3100 meters, the total length is 11560 meters, and the maximum buried depth is about 1200 meters. It is called by railway builders. The hardest bite is the "hard bone" and the most dangerous "blocker".
The builders of China Railway 19th Bureau Group, which is in charge of the Milin Tunnel, operate in the tunnel. Photo by He Penglei
According to He Xu, the commander of the Lalin project of China Railway 19th Bureau Group Co., Ltd., the construction of the aeolian sand section of the Milin Tunnel is like drilling a hole in an hourglass. Successfully locked the sand layer that is easy to leak and slip, making the soft "sand mountain" hard, and it passed the 76-meter aeolian sand section smoothly for 4 and a half months.
Through the Milin tunnel. Photo by He Penglei
At the same time, there is a 7,500-meter rock burst section in the Milin Tunnel, accounting for 64.88% of the total length of the tunnel. The security risk is extremely high. Especially in the construction of the strong rock burst section of more than 5000 meters, the rock mass of the tunnel is like a loaded gun, and it is easy to eject the block.
The prediction of rockburst is a worldwide problem. Builders use two methods of strength-stress ratio and microseismic monitoring to predict rockburst. The effective accuracy of the two methods can reach more than 70% after the combination of the two methods. The forest railway rockburst prevention provides an effective basis.
In the Sangzhuling tunnel, the key control project of the entire Lalin Railway, the person in charge of technology detected the rock temperature in the tunnel as high as 60 degrees Celsius through electronic equipment. Zhao Yanshe
On the same day, the geology of the Tibetan-Garlic tunnel, which runs through the same day, is also very complicated, with large water influx, frequent changes in formation lithology, and poor self-stability of surrounding rocks. The moraine layer with a total length of 960 meters is the first in the history of national railways.
To this end, the construction unit has overcome multiple geological difficulties by means of a variety of scientific and technological means such as a three-arm rock-transformer trolley, pre-fabricated ice blocks outside the cave to cool the cave, and the use of geological radar to detect geology in advance.
Thousands of miles of "green" traffic artery
The Lalin section of the Sichuan-Tibet Railway has crossed the Yarlung Zangbo River 16 times in succession, digging holes in every mountain, and crossing bridges in water. "Environmental Protection Bridge".
The Zangmu Bridge uses a 430-meter half-through concrete-filled steel tube arch with a height of 112 meters. The bridge spans the Yarlung Zangbo River Canyon and the water depth is 66 meters.
Zangmu Bridge. Photo by He Penglei
Due to the high altitude of 3300 meters, the bridge is very difficult to maintain and maintain in the later stage, coupled with the high cold, large temperature difference, strong ultraviolet rays, dry climate and ecological fragility in the area.
Therefore, the main material of the bridge is made of paint-free weathering steel for the first time, so that the bridge manufacturing does not require paint coating, which not only reduces construction time and maintenance costs, but also extends the service life of the bridge and is more conducive to protecting the ecological environment in Tibet .
Gongga Yarlung Zangbo River Bridge in the track. Photo by Zhao Lang
In the production and construction of steel tube arches, the China Railway Baoqiao Project Department adopts the three-site manufacturing mode of "Linzhi processing-plus inspection and assembly-bridge installation in the canyon", that is: the completion of the manufacture of dumbbell-shaped string units at the Linzhi processing plant. Then transported by car to the site of the General Assembly of Jiacha for assembly, and finally transported to the bridge in the canyon to complete the installation, fine adjustment and girth welding of the beam section, and the transfer distance of the rods was shortened to more than 300 kilometers.
In this way, the construction work on the Yarlung Zangbo River is minimized, which not only meets the needs of the production period, but also meets the requirements of ecological and environmental protection, making the Zangmu Super Bridge truly a "nature bridge" and "environmental protection bridge".
The 2020 Tibet Eco-environmental Protection Working Conference pointed out that Tibet ’s average air quality quality rate has exceeded 95 for seven consecutive years.
In addition, the Lalin Railway has also given full consideration to the environmental protection of construction. The construction sewage will be discharged into the Yajiang River after three precipitations. There are specified accumulation points for the waste residue. Trees along the railway have been transplanted instead of felled.
Liu Hao told reporters that electrification construction belongs to the project behind the Lalin Railway Station, which has a smaller impact on the ecological environment along the line. They started from the subtleties and focused on resource protection, dust control, harmful gas emission control, engineering waste control, water and soil pollution Control, light pollution control, noise and vibration control have formulated a series of measures to ensure that the nature reserves and landscapes along the route are not damaged.
Linzhi Ni Yang River scenery. Photo by He Penglei
Liu Hao said that with the completion of bridges, tunnels, roadbeds and other projects, the Lalin Railway has entered the stage of large-scale power construction on the entire line, which also indicates that the project has entered the "fast lane" of full construction.
Peach blossoms bloom in Linzhigala Peach Blossom Village. Zhang Jingshe
The Lalin Railway will be completed by the end of 2020, and will be operational in 2021. By then, Nyingchi will be blooming again and again, it will be the most beautiful spring in the snowy "Jiangnan".
Author: Ho Peng Zhang Lei