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business TBM
Mechanical excavation method that escabates a rock not by previous explosives blasting method but by crushing or cutting a rock for the rock tunnel, utilized surrounding rock as a sub-timer. It is mechanically stable round strcuture. Therefore, the construction time is short because of largely reduced timbering materials such as SHOTCRETE or ROCK BOLT and especially, in terms of the construction cost and period for longitudinal tunnel it is fairly superior method than previous one.