Wuhan Lianghu tunnel shield machine cutter head well smoothly, is expected to the end of June

June 3, Wuhan Lianghu tunnel Province Bo working well site, about 5 stories high "Gongxun" shield machine tool plate slowly lifted down the well, the shield machine to complete the assembly of important nodes, is expected to the end of June tunneling.

The Two-Lake Tunnel project is the world's largest urban underlake, double-layer super-large diameter tunnel, starting from Qinyuan Road and East Lake Road in the north, and running through East Lake and South Lake, with a total length of about 19 kilometers. "Gongxun" shield machine is 140 meters in length and 4000 tons in weight. It will be used for the tunnel construction from The working well of Shengbo to the working well of Qinyuan East Road. The excavation length is 1690 meters, the excavation diameter is 15.094 meters, and the minimum turning radius of the initial section of shield tunneling is 600 meters, which is the first time in the same level of shield tunneling construction in China.

According to the introduction, during the tunneling process of shield tunnel in this area, it goes through Line 8, Line 4 and pipeline, and goes through the construction (structure) for many times. It goes through the complex stratum, and the layers are uneven in hardness and hardness, and the strength is different. The excavation section is soft on the top and hard on the bottom. The maximum longitudinal slope of shield tunnel is 4.5% and the maximum buried depth is 41.7m, which brings great challenges to construction.

According to the characteristics of the engineering, China railway shisiju on tunnel projects department for shield machine configuration combined with pressure cutter, high pressure main drive seal, large flow mud flushing circulation system, high precision gas-liquid pressure balance control system and application of efficient material handling and high precision synchronous assembled box culvert and wall after a number of key technologies, such as synchronous grouting compactness detection The adaptability and reliability of shield machine are greatly improved.

After the completion of the two-Lake tunnel, a north-south fast passage will be formed in Wuchang area, which can effectively relieve the traffic pressure of the second ring Road, Lhoshi South Road, Fruit Lake tunnel and other roads, and constantly improve the regional road network system to facilitate the travel of residents in the surrounding area. At present, two shield machines are being assembled for the three working Wells in the East Lake section of the Lianghu Tunnel, and they will start digging in the near future.