2-Arch Tunnel with Extension Tunnel and Method for Constructing The Same

摘要

2 arch tunnel construction method and its extensions expanded tunnel having a tunnel to the outside of the ship are provided. 2 arch tunnel having a main road tunnel extended in accordance with the present invention is provided with the main left and right sides at the top of the central support wall and the central support wall having a second main line tunnel arch of the pair to form a continuous surface with the center support wall tunnel portion and the second arch is provided at the outer side of the main road in a tunnel wall separating the support and the separating wall forming a continuous support surface and the second main line tunnel arch outward expansion to form a continuous main line tunnel side wall and the separation support the extension comprises a tunnel having .