In November 26th, with the last two cycles of lining concrete pouring operation is completed, marking the Lanzhou Xining second lane tunnel main project is completed, the solid foundation for laying up on schedule in January 1, 2014.
by the China Railway five Bureau Lanzhou second double project headquarters responsible for the construction of the Xining tunnel length of 5750 meters, is located in the East District, North District of Xining City, a full set of import and export, 2 tunnels and 2 inclined shaft, a total of 10 working face at work. The entrance section of 1370 meters for the construction of the shallow buried section of tunnel under the heavy difficulty, respectively wear Lanxi highway, residential area, industrial and mining enterprises, the canal, the thickness of covering soil is 6 – 27 meters, shallow section required the demolition of more than 1 thousand and 400 households, factories and mines in 8, about 500 meters diversion drains. With a tight schedule, the task is heavy, demolition difficult, high groundwater table, groundwater rich, difficult construction, high security risks, etc., by the China Railway Corporation as a high-risk tunnel. (author: Kong Xiangrui & Yang Zhengpei)
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