EXECUTION METHOD OF TUNNEL

摘要

PURPOSE:To form a continuous lining by forming a channel parallel with the direction of the excavation of a tunnel along the outer circumferential surface of the tunnel to be excavated in a method of pre-lining construction. CONSTITUTION:A drilled pit 19 along the internal surface of a tunnel 10a is formed to the surface of a facing 18 at the front end section of a tunnel 10 during excavation. The drilled pit 19 is expanded to the outside of a tunnel 10b to be excavated. A first chain saw 14 is arranged in parallel with the direction of the excavation of the tunnel 10b at a place on the outside of the tunnel 10b in the drilled pit 19. The first chain saw 14 is moved along the outer circumferential surface of the tunnel 10b, thus forming a channel 12. The inside of the channel 12 is impregnated with mortar, thus forming a lining 11 parallel with the direction of the excavation of the tunnel along the outer circumferential surface of the tunnel to be excavated.