Recently，Composite type remanufactured jointly by China Railway Construction Heavy Industry and China Railway 20th BureauTBM“Flame 7”Zhuyuancun Station, Phase I of Chongqing Rail Transit Line 24—Bid section of Chongqing East Railway Station started smoothly，Start digging。

“Flame 7”Compound typeTBMExcavation diameter after remanufacturing 6.86 meters，Length of complete machine: 82m，The installed power is 1750 kW，It is the first composite type of super-large slope construction in China's urban rail transit industry.TBM，The maximum construction slope is 43‰。

“Flame 7”Compound typeTBMOriginating

Chongqing Rail Transit Line 24 Phase I Bid 1 Project is located in Banan District and Jingkai District of Chongqing.，Three stations and three sections in total，Antler North Station、Kuangjiatang station、Chuk Yuen Tsuen Station、Antler North Station—Kuangjiatang station section、Kuangjiatang station—Zhuyuancun station section、Chuk Yuen Tsuen Station—Chongqing East Railway Station section，The total length of the line is about 5.Four kilometers。“Flame 7”Zhuyuancun Station where the excavation started—Chongqing East Railway Station section，Tunnel length approx. 2.Five kilometers，The main geology of the interval is miscellaneous fill.、Sandy mudstone、Sandstone。Burial depth of tunnel roof 71.7—72.95 meters，Present“V”Zi Po，Make a turn after 500 meters horizontally，Maximum gradient up to 43‰，Tunneling turning with super-large gradient、Uneven hardness of the formation，Shield construction is difficult.。

According to the engineering characteristics of the project,，China Railway Construction Heavy Industry and China Railway 20 Bureau have overcome many technical difficulties in equipment.。In order to better control the tunneling attitude of the equipment,，Adapt equipment to steep turn、Tunneling in uneven hard and soft strata，China Railway Construction Heavy Industries is right“Flame 7”Compound typeTBMA series of adaptive upgrades have been carried out.，The risk of shield construction is effectively reduced.。

“Flame 7”Compound typeTBMConstruction site

After the completion of the project, the north-south transport capacity of Chongqing rail transit can be effectively improved.，Enhance the radiation range of Chongqing East Railway Station，Provide convenience for citizens to travel，Providing Prerequisites for Building Future Industrial Clusters。