Recently，China Railway Construction Heavy Industry Co., Ltd. is the first one applied to the auxiliary construction of expressway in China.“Yuecheng Liangshan”TBMThe cutter head breaks through the rock.，It marks the longest expressway tunnel in southwest China.——Daliangshan No.1 Tunnel of Lexi ExpresswayTBMThe construction task of the contract section was successfully completed。

Daliangshan No.1 Tunnel of Lexi Expressway is the longest expressway tunnel in southwest China.，It is also the first one adopted in China.TBMAuxiliary construction of expressway tunnel。Wherein, the flat pilot tunnelTBMThe construction section is 10 long.68 kilometers，Burial depth 30～1037 meters，The bedrock is mainly silty mudstone.、Fine Sandstone、Limestone, etc，ⅣClass、ⅤClass II surrounding rock accounts for about 93 percent.5%，The saturated uniaxial compressive strength is mostly 8.3-61.3 MPa，Mainly low gas、Karst、Unfavorable geology of tunnel such as soft rock deformation，TBMThe construction is difficult.。

Those involved in the construction of the tunnel“Yuecheng Liangshan”Its predecessor is the first domestic open type used in Jilin Songhua River Diversion Project.TBM，Has created the highest daily footage of 86..5 meters、Maximum monthly footage 1208.A record of 6 meters.。

After this remanufacturing, it is used in Lexi expressway.KLot 2，Named as“Yuecheng Liangshan”，The total length of the equipment is 175 meters，The total weight is 1400 tons，China Railway Construction Heavy Industry、Jointly built by China Railway 18th Bureau，Optimized design scheme according to geological characteristics of Lexi expressway;，Advanced pipe shed support is loaded、Reinforcement row instant support、Mechanical emergency spraying and mixing system、Cutterhead real-time expansion and other key technologies。

As the long-awaited line of getting rich for the Yi people in Liangshan、Connecting line，Railway Construction Heavy Industry promotes related work with a high sense of mission and responsibility.。The equipment will be transported back to the factory on March 10, 2020.，During the period of maintenance and renovation, the problems such as tight construction period were successfully overcome.；Successfully offline on July 10, 2020，Transportation、The assembly took only two months.；It was officially launched on October 20, 2020.，During the excavation, the expressway in China was created.TBMDaily driving footage 49.12 meters、Monthly footage 723.The fastest record of 82 meters.，The national expressway has been refreshed many times.TBMFastest tunneling construction record，The total excavation mileage is about 26 kilometers.。