3.2 De-fuming, Mucking and Scaling

• It takes about 30 minutes to expel the fumes out of the tunnel. All the workers and engineers are supposed to move out of the tunnel during this process.
• After De-fuming, mucking operation starts. Mucking is the operation of removing the blasted rock from the tunnel face.
• In Rohtang tunnel, a conveyor belt is used to convey the Muck out of the tunnel. The conveyor mechanism has been installed by ROWA Tunneling Logistics.
• The facilities are designed in such a manner, so that muck volume of 600 tons per hour can be effected.
• The removal of loose rock which has not been removed during blast is called as Scaling. Usually this operation is done using Hydraulic hammer.
  
   
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