China News Agency, Linzhi, April 8 Question: Overcoming many world-class engineering problems, Lalin Railway construction enters the "fast lane"

Author Zhang Wei He Penglei

The Milin tunnel of the Lhasa-Linzhi section of the Sichuan-Tibet Railway in Linzhi, Tibet ("Lalin Railway" for short) has recently been opened, marking the end of the entire tunnel of the Lalin Railway. The construction side Luo Zhenping, executive deputy commander and chief engineer of the Lalin Railway Command of China Railway 19th Bureau Group Co., Ltd., described the construction difficulties as follows: "Excavating in the aeolian sand section of the tunnel is like making a hole in the hourglass."

"The aeolian sand formation with a length of nearly 100 meters is located at the exit of the Milin tunnel, and its self-stability is extremely poor, and it will collapse when touched." Luo Zhenping said that the construction personnel combined the specific causes and engineering of the aeolian sand tunnel in the plateau area Geological characteristics, trial and error exploration, and innovative craftsmanship have successfully "locked" the soft sand layer.

As the key engineering project of China's "Thirteenth Five-Year Plan", Lalin Railway is the first electrified railway in Tibet, with a design speed of 160 kilometers per hour. The total length of the bridge and tunnels accounts for nearly 75% of the total length of the line. It is expected to open in 2021. Of the 47 tunnels on the whole line, 14 are high-risk tunnels, and 6 are long tunnels of 10,000 meters. Since the construction started at the end of 2014, construction personnel have overcome world-class rock burst predictions, crossing moraine layers and aeolian sand layers. Tunnel construction problems.

Zhu Jintang, the owner of the Lalin Railway Project and the deputy general manager of Tibet Railway Co., Ltd., told reporters that the builders of the Lalin Railway have obtained 32 patents and formed many mature construction technologies and management experience. "In addition to the entire line of tunnels running through the Lalin Railway, 120 bridges have also been built and 119 have been completed, laying nearly 120 kilometers of track, laying the foundation for the smooth progress of the entire line and the completion of scheduled quality assurance."

According to Liu Hao, the deputy manager of the Lalin Railway Power and Electric Traction Power Supply Project and the China Railway Electrification Bureau Group ’s Lalin Railway Fourth Electricity Project Manager Department (referred to as “Lalin Railway Four Electricity Project Department”), with the Subgrade and other projects have been completed one after another, and the project behind Lalin Railway Station will also be fully launched. "Because the cross-interference with the project in front of the station is greatly reduced, the Lalin Railway has entered the stage of large-scale construction of power across the entire line."

"In order to deal with the impact of the high-altitude environment on reducing the efficiency of inland construction workers, we actively promote the concept of 'mechanical substitution'." Liu Hao said that there is no mature plateau construction experience at home and abroad for reference, and there is no similar Under the conditions of engineering equipment selection and process standards, only relying on collective wisdom, the first-line workers put forward needs and ideas, and then the scientific research team tackles the problem.

After repeated attempts, the project department innovated and developed a number of new technologies and new equipment such as a rigid hanging string automatic processing platform, a pillar assembly automatic decoupling device, a mobile working platform truck in the tunnel, and a dual-purpose working platform truck for highway and railway. Report the project of "Key Technologies and Construction Equipment for Construction of Sichuan-Tibet Railway Traction Power Supply System".

Liu Yuxiang, chief engineer of the 4th Engineering Project Department of Lalin Railway, said that the above-mentioned innovative craftwork method not only guarantees the safety of construction personnel and saves costs, but also benefits the ecological protection along the Lalin Railway. "At present, our workforce is less than that of the same size project in the Mainland, and the construction processes such as anti-corrosion of materials that may affect the environment can also be completed before entering the site."

Liu Yuxiang said that more than a thousand construction workers in Lhasa Railway Station, Linzhi, Shannan and other places have all arrived at the post, and the related materials and equipment will be available soon. "Now the operation area is fully spread out. By the end of this year, the entire track can be laid. It can be said that the Lalin Railway is now entering the "fast lane" of full construction. "(End)