CONSTRUCTION METHOD OF UNDERGROUND STRUCTURE

PURPOSE: A construction method of an underground structure is provided to improve constructionability by using a temporary facility as the wall of a soil retaining structure and a target structure and to minimize traffic congestion by restoring a road surface during the construction of an underground structure. CONSTITUTION: A construction method of an underground structure comprises the following steps: constructing a plurality of overlap type peristyle piles (100) on a road surface; excavating gaps between the overlap type peristyle piles to a predetermined depth; installing a precast beam (210) on the excavated surface between the overlap type peristyle piles, pouring concrete to the upper part of the precast beam, and constructing an upper slab (200); restoring a road surface (300) to the original state by backfilling the upper surface of the upper slab; excavating the lower part of the upper slab by using the upper slab as a strut; and constructing a lower slab by applying reinforced concrete on a bottom surface where the excavation is completed.