| 摘要 |
<p>PURPOSE: A method for constricting a tunnel using a perpendicular hall is provided to reduce civil application by reducing the period and cost for construction. CONSTITUTION: A vertical shaft is constructed to an underground area(t) in which a tunnel is formed to a lower part from an upper part. An inner tunnel is constructed to the outside from the bottom of a perpendicular hall. An outer tunnel is constructed to the outside from the side. A tunnel is passed through by the encounter of the outer tunnel and inner tunnel.</p> |
