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Tunnel construction by means of road headers. Performing underground mining in solid and standing ground the stage face method is used. In this case The face is opened for full section in two stages and after that the permanent lining is raised.

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Road header machine in Construction - Basic Civil Engineering

A road header machine called a boom type road header. Road headers are advanced, self forced and extremely powerful rock cutting machines are designed to excavate roadways, tunnels and compartments continuously without using volatile.

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