The first "yellow crossing" subway construction in China, to overcome the complex geology, overcome the difficult problem of wearing yellow
In January 30th, China's first in Lanzhou Metro Line 1 the Yellow River subway tunnel project to Ma Ying door Beach Beach interval left line tunnel to the South Bank of the Yellow River River, following last year's right line tunnel across the Yellow River for the first time, the successful implementation of double line tunnel through yellow interval operation.
The right line tunnel is about 1906 meters long, and the left line tunnel is about 1908 meters long. The length of the left and right lines below the the Yellow River section is 404 meters. In November 1, 2014, Ma Ying interval officially started construction, developed by our own Jincheng slurry shield machine production "No. 5" from the north the Yellow River yingmen Beach Station of origin; last April, "Jincheng No. six" slurry shield machine from the same yingmen Beach Station of origin, direction of the heading to the horse Beach station.
It is reported that the left line tunnel has already passed through the Yellow River, the shield is above the South Binhe road. Extension of subway tunnel is not completely, but there is a moderate bend, launched the speed to facilitate the train, "Jincheng No. six" shield current position, just the lowest point that the curved tunnel, tunnel through here will set a pumping station, used to extract sediment slurry.
Ma Ying long distance interval shield construction across the upper reaches of the Yellow River high water, large size, high hardness of sand gravel stratum, there exist a large number of boulders, shield method by the underlying conditions and hydrological conditions, as well as the tunnel inflow of water, sand and other risks, through construction of shield segment has been well-known experts Huang in China is defined as "technical problems of the world".
In the face of difficulties, the basic construction unit and the parties participating in the construction of Lanzhou Rail Transit Co., prepared in the early, conducted several rounds of technical seminars and expert argumentation, completion of the Yellow River River and the surrounding geological exploration, technical program and equipment materials and other preparatory work. In the process of tunneling through the Yellow River, the project organization of the sixteen Bureau of the Railway Bureau of the construction unit is scientifically organized and constructed. According to the geological conditions, groundwater conditions and hydrological conditions in the Yellow River, a scientific and reasonable shield tunneling parameter is set up, and the driving control is strengthened.
At the same time, in view of the risk of easy instability in the Yellow River, timely underwater grouting reinforcement, advance support in the cave and other measures to ensure the safe, stable and controllable tunneling process.
Through the joint efforts of all parties, "Jincheng No. five", "Jincheng No. six" slurry shield machine has to wear silver Road, north the Yellow River, North Riverside Road, the middle shaft wetland park. Following the December 31, 2015 "Jincheng five" shield machine successfully through the the Yellow River River, "Jincheng six" shield machine in January 30th this year also successfully completed in the Yellow River Ma Ying interval task, thus Ying Malaysia in the Yellow interval successfully double lane tunnel across the Yellow River, provide a lot of successful experience for the first phase project of line 1 and subway construction project in yellow.
According to the next construction plan, "Jincheng No. six" shield machine will continue to the station after the arrival of the South Bank of the Yellow River, and it is expected to be completed in October this year to meet the cross section of the double track tunnel.
