China Railway Construction Heavy Industry Co., Ltd. Two Super TBM Helps Tianshui Quxi Urban and Rural Water Supply Project Diversion Tunnel Complete

Two dragons join forces to split the mountain and divert water。Recently，Slowly rotate with the cutter head，AtTBMIn the roar and the breaking of the rocks.，Downstream section of headrace tunnel“The Yellow River”TBMGet out of the hole smoothly，It marks the completion of the 22 km diversion tunnel of the urban and rural water supply project in Quxi, Tianshui, Gansu.。

The diversion tunnel of Tianshui Quxi Urban and Rural Water Supply Project adopts two super-strong double shields jointly built by the Railway Construction Heavy Industry and the Third Hydropower Bureau.TBM“The Yellow River”And“The Yangtze River”Tunneling construction。From twoTBMMobilization and assembly、Debugging、Since the excavation，The project team of Railway Construction Heavy Industry and the Third Hydropower Bureau overcame the difficult working environment.、Complex geological conditions and many other difficulties.，Successfully crossing 19 major faults，A series of unfavorable geological problems such as fault fracture zone and convergence deformation of surrounding rock have been solved.，Create small diameters at home and abroadTBMPrecedent of disposal of similar works。

Wherein the upstream segment“The Yangtze River”TBMDepart from headrace tunnel inlet on August 22, 2022，It took 483 days to complete the tunnel on December 18, 2023.。Good results have been achieved repeatedly during the excavation period.，Created a 4-meter double shieldTBM（Slag tapping mode of mine car）Maximum monthly footage 705.23 meters、Maximum daily footage 31.21 meters of tunneling record，It has achieved excellent results of breaking through 600 meters in tunneling footage for four consecutive months.。

“The Yangtze River”And“The Yellow River”TBMOptimizing the structural design、Ensure small diameterTBMOn the basis of space requirements，It is the first time to adopt the cutter head with adjustable slag feeding amount、Small diameterTBMThe hydraulic motor gets out of trouble、New design such as advanced grouting hole preposition，Greatly improves this type of dual shieldTBMThe ability to get out of trouble，Provide strong guarantee for efficient and safe construction。

Tianshui Quxi Urban and Rural Water Supply Project is a major construction project in Gansu Province.，It is also a key livelihood project of Tianshui Water Conservancy.，The completion of the diversion tunnel also marks that the project has achieved phased results.。Railway Construction Heavy Industry will continue to develop and manufacture high-performance equipment to help major construction projects。

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