NON-SUPPORT CONSTRUCTION METHOD USING THE DECKPLATE FOR WALL GIRDER

A non-support underground construction method is provided to omit the installation of support for wall girder construction and to reduce the construction period. A non-support underground construction method comprises following steps: (a) a step for carrying out the construction the slurry wall the shear key is embedded in junction with the wall girder to the extrusion; (b) a step for digging out slurry wall internal space; (c) a step for setting up the bracket for the deferment in the slurry wall under junction with the wall girder of the location in which the existing step is under construction; (d) a step for setting up the deck plate for the wall girder for the wall girder construction it surrounds the slurry wall; (e) a step for setting up the existing step it faces the slurry wall the end part is contained inside the deck plate for the wall girder; (f) a step for applying the concrete inside the deck plate for the wall girder; (g) a step for removing the bracket for the deferment.