Recently，Jointly built by China Railway Construction Heavy Industry and China Railway 18th Bureau“Yuecheng Liangshan”TBMThe cutter head breaks through the rock.，It marks the successful completion of the construction task of Daliangshan No.1 Tunnel of Lexi Expressway.。

The parallel heading of Daliangshan No.1 Tunnel of Lexi Expressway runs through the site.

It is reported that，Daliangshan No.1 Tunnel of Lexi Expressway is the longest expressway tunnel in southwest China.，It is also the first one adopted in China.TBMConstruction of Expressway Tunnel with Middle Parallel Adit。Wherein, the flat pilot tunnelTBMThe construction section is 12 long.313 kilometers，Burial depth 30～1037 meters，Tunnel crossing“Three major structures+2 large faults”And a variety of strata of different properties，The crustal stress is 19.5 MPa，TBMThe construction is difficult.。

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

“Yuecheng Liangshan”Site assembly

 “Yongji”After remanufacturing, it is applied to Lexi Expressway.KLot 2，Be renamed as“Yuecheng Liangshan”，The total length of the equipment is 175 meters.，The total weight is 1400 tons。Based on the complex geological conditions of Daliangshan No.1 Tunnel，China Railway Construction Heavy Industries is right“Yuecheng Liangshan”TBMTargeted optimization and transformation have been carried out.，Advanced pipe shed support is loaded、Reinforcement row instant support、Mechanical emergency spraying and mixing system、Cutterhead real-time expansion and other key technologies，TBMDuring the period of tunneling construction, it has successively created domesticTBMSingle Head Day Excavation 49.12 meters、Monthly excavation 723.82 meters、3680 meters of continuous excavation in 6 months、6387 meters of continuous excavation in 12 months、Continuous excavation of 8825 meters in 18 months and many other national records，And refresh the national highway many times.TBMFastest tunneling construction record，Realize the completion of the whole tunnel 2 months ahead of schedule。

Adopted by Daliangshan No.1 TunnelTBMSuccessful Application of Parallel Adit in Construction，It fills in the technical blank of the same type of expressway construction in China.，It is a milestone for the construction of highway tunnels in China.。After the completion and opening of Lexi Expressway，Will be with Chengdu and Chongqing、Jing Kun、Rongli and many other national trunk lines are connected.，To consolidate and expand the achievements of poverty alleviation in Liangshan Prefecture、It plays a very important role in promoting rural revitalization.。