Modular underground structure supported by the wall gangbim applied for pc

The present invention relates to a method of connecting underground structures and modular PC PC slab and wall construction by the top-down construction method of modular wall underground structures using a PC gangbim applied for support, the construction method. More specifically, by making the number of PC and PC wall slabs, comprising a carrying area; Comprising: digging a trench in the ground so that both sides in the width direction and spaced apart a specific distance, geonip a body of the PC on the trench walls of the excavation, respectively; Geonip gangbim by the supporting holes respectively formed in the hollow body portion of the step of supporting the PC geonip wall; Step of drilling a ground portion of the wall between the PC until the upper part of the body portion revealed; Incorporating a plurality of PC slab, the step of connecting both ends to a pair of upper side walls PC; Steps to recover the road surface and the excavation is installed inside the lower side of the PC ground slab, a lower slab casting; And to a top-down construction method of the modular ground support structure using the PC for which a wall is applied gangbim characterized in that it comprises the step of dismantling the said support for gangbim.