Recently，At the construction site of Tianshui Quxi Water Conveyance Tunnel Project，Accompanied by the rotation of the cutter head and the roar of rock breaking.，Jointly built by China Railway Construction Heavy Industry Co., Ltd. and the Third Hydropower Bureau“The Yangtze River”TBMBreak through the rock，Successfully helped the upstream water conveyance tunnel of Tianshui Quxi Urban and Rural Water Supply Project run through smoothly，Marked“The Yangtze River”TBMThe construction task was successfully completed.。

Equipment-assisted project through the site

The total length of the water conveyance tunnel of Tianshui Quxi Urban and Rural Water Supply Project is 21.46 kilometers，Two super-strong double shields developed by China Railway Construction Heavy Industry Co., Ltd.TBMTunneling construction。“The Yangtze River”Optimizing 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。

The equipment is offline

“The Yangtze River”TBMDepart from the inlet of the water conveyance tunnel on August 22, 2022，It took 483 days to complete the tunnel smoothly.。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 705.225 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.。