Recently，By China Railway Construction Heavy Industries、Small-diameter exploratory tunnel jointly built by China Power Construction Vibroflotation and the Sixth Hydropower Engineering BureauTBMOvercome all obstacles，Refresh the progress in the construction of an exploration tunnel project in the southwest region，Single-head tunneling breaks through the 2000 meter mark。TBMIn December 2023, he created a record of 617 meters per month.，Refreshed the small diameter in the southwest regionTBMConstruction records，Continuous footage breakthrough of 1180 meters in two months，New breakthroughs have been made.，Speeding up the progress of the project。

Equipment shaped exploration hole

The geology of the project area is complex.，Large burial depth、The ground stress is high、The fracture zone is uncertain.，TBMThe construction is faced with less geological data、There is little experience for reference.、High engineering risk and difficult construction。

TBMExcavation diameter 3.53 meters，Equipment R & D and manufacturing team for safety、Reliable、Efficiency and adaptability are the primary criteria，Key breakthroughs that may occur in the construction“Long distance fault fracture zone”“A big gush of water”“Rock burst”And other industry problems。TBMComplete rebar rows are provided、Steel Arch、Anchor Rod、Shotcrete support system and advanced geological prediction system，It provides an effective guarantee for the safe and efficient excavation of the exploration tunnel.。

Equipment commissioning in workshop

FromTBMSince the beginning of excavation，TBMEncountered 50 cubic meters of water per minute.、Long distance fault compresses fractured zone formation，In the Sixth Bureau of Water and Electricity、Sincere cooperation between China Power Construction Vibroflotation and China Railway Construction Heavy Industry Co., Ltd.、With joint efforts，Conquered“A big gush of water”“Large burial depth”“Long distance crushing”Small diameter under equal formationTBMA Worldwide Difficult Problem in Tunnel Construction，It overcomes the difficulty of transportation in snowbound mountains.、Frequent rain and communication failure、Natural and objective difficulties such as cutting off water and electricity，Safely pass through the fault zone and the affected zone for more than 100 meters。