Research on Ventilation Technology Scheme and Equipment for TBM Construction of Long Tunnel
In order to effectively solve the ventilation problem during the construction of long tunnels,based on the excavation of the diversion tunnel of a water conservancy project in Xinjiang,based on the calculation of the air volume and air pressure of the two construction sections of TBM1 and TBM2,the appropriate fans and ducts are selected,and the ventilation scheme during tunnel construction is determined:the fan is SWEDFAN/Swedish brand,the duct is Kodifa brand,and the TBM construction ventilation adopts a one-stop forced ventilation system.Two sets of axial flow fans are arranged near the portal of the 1 # branch tunnel.Among them,a model 3 × AVH-R140.132.4.8 fan is arranged in the TBM1 excavation section.A 3 × AVH-R140.160.4.8 fan is arranged in the TBM2 tunneling section,and the diameter of the soft air duct is 2.2 m.Fans and ducts send fresh air into the tunnel through smoke exhaust,exhaust and ventilation.At the same time,the gas in the tunnel is discharged from the hole to form a smooth circulating respiratory system.The conclusion can provide technical support and valuable construction experience for tunnel safety ventilation.
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