TOP-DOWN CONSTRUCTION METHOD USING A BRANCH-TYPE STEEL FRAME WITH CHANNELS FOR THE CONTINUOUS CONSTR

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The present invention relates to a top-down construction method which directly withstands earth pressure by means of an underground part (beam, slab) of a building while excavating, to construct the underground part of the building. More particularly, the present invention relates to a method for constructing the underground part of the building in a top-down method and continuously constructing an underground retaining wall in a bottom-up method using a branch-type steel frame with channels. The top-down construction method according to the present invention is technically characterized in that the branch-type steel frame with channels assembled thereto is installed between an earth-retaining wall and a slab in the construction of the underground part of the building so as to effectively transfer earth pressure, and the underground retaining wall is continuously constructed in a bottom-up method after ensuring the space for construction of the underground retaining wall.