Construction method for underground tunnel using guiding shape steel

The present invention is possible to precisely construct the underground tunnel by using the guide-shaped steel formed in the steel pipe and bonded to the housing when pushing the concrete enclosure after pressing the protective steel pipe to reinforce the ground and to minimize the impact on the upper ground It relates to a ship propulsion method using a guide section steel. Such a method of propulsion includes: a) constructing a propulsion base in front of a section in which an underground tunnel is to be constructed and a reaching base behind it; b) forming a steel pipe composite by forming a plurality of steel pipes in accordance with the position where the outer wall of the enclosure and the upper slab will be constructed, and removing the earth and sand inside the steel pipe; c) inserting a guide section steel into the steel pipe composite; d) fabricating the enclosure at the propulsion base, such that the end of the guide section is joined to the enclosure; e) pushing the enclosure while removing portions of the steel pipe that interfere with the enclosure and soil in front of the enclosure; f) disengaging the enclosure and the guide section steel ends; g) filling the mortar between the outer surface of the enclosure and the inner surface of the steel pipe.