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      Tunnel Boring Machinery

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      Tunnel boring machines are those machines that are used for excavating tunnels of circular cross section of different diameters. Through tunnel boring machines (TBM), tunnels are excavated in different types of geologies. It is alternate to blasting and drilling, which without disturbing the surroundings produces a smooth tunnel wall. Tunnel boring machines (TBM) generally has protective shield for the tunneling purpose. The machines consists of either single shield or double shield depending upon the nature of the topography. Various types of tunnel boring machines that are used for the purpose of excavation are :
      Tunnel Boring Machinery

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