THE TUNEL EXECUTION METHOD

摘要

PURPOSE: A trenchless tunnel construction method is provided to reducing the whole working hours and the number of required steel pipes by constructing a tunnel structure directly in the inside of a tunnel, thereby reducing costs required for the whole tunnel construction. CONSTITUTION: A trenchless tunnel construction method comprises the following steps of: the step(S10) of pushing a middle-diameter steel pipe into the upper part of a tunnel area; the step(S20) of pulling an upper slab along the area in which the middle-diameter is pushed; the step(S30) of forming a pilot tunnel hole respectively on the lower part of the side and on the lower part of the center by excavating the area composing the lower ends of both sides of the pulled upper slab, an inner wall setup as a center part and the area composing the lower end of a column part; the step(S40) of installing a tunnel support member to get closer with the side wall area of the tunnel by a line excavation respectively both sides of the area stretched from the center of the upper slave to the pilot tunnel hole and forming a pillar after excavating an area for a pillar of the cente; the step(S50) of reinforcing an excavated side after installing multi nails by the excavation to get closer to the side wall are of the tunnel; the step(S60) of excavating for the expansion of the side wall of the tunnel; the step(S70) of placing concrete to form a tunnel support and a side wall structure of the tunnel; the step(S80) of placing a foundation ground concrete and a foundation water-proofing material after the excavation of the inside of the structure; and the step(S90) of placing a lower slab. [Reference numerals] (S10) Step of inserting and propelling a middle-diameter steel pipe; (S20) Step of pulling an upper slab; (S30) Step of forming a pilot tunnel; (S40) Step of forming a pillar; (S50) Step of excavating a side wall of the tunnel and reinforcing ground; (S60) Step of excavating for the expansion of the tunnel side wall; (S70) Step of installing an upper slab support and a tunnel side wall structure; (S80) Step of earthwork in the structure; (S90) Step of placing a lower slab