Top-down construction method for underground structure with slurry wall retained by slab diaphragm effect

The present invention relates to a construction method of the underground structure to be constructed in a way to build a basement of a building structure, especially using a slurry month (Slurry Wall) as a ground retaining wall and backhand (TOP DOWN) method. Building underground structure construction method provided by the present invention comprises (a) a structure is inserted into the digging a trench in the outer border region to be installed, and the filler is attached to the place to be cheolgolbo location reinforcement mesh in the trench in the following, inside the trench, a step of pouring concrete construction of the underground slurry January; (B) forming a steel column to position the column is to be installed in the building installation driving vertically from the ground and, based on the lower end of the steel column portion; (C) the step of throwing up roll the inside of the slurry month, form a mounting space for the slurry cheolgolbo month wall by removing the filler from the wall of the slurry month; (D) the step of installing the side not to receive the earth pressure, but through the end of the cheolgolbo the filler is removed portion of the slurry month, to space the side end of the month cheolgolbo from the slurry; (E) the step of casting slab concrete and connecting the slurry month to an upper portion of the cheolgolbo; And in that it comprises a basic technical feature; (f) performing repeatedly to the base level of the step (c) to (e) step of the process. In accordance with the present invention as described above, since the lateral soil pressure acting on the slurry month in the basement construction in the structural support surface by gangmak action of the slab structure effectively as well as to further improve the resistance to soil pressure than the conventional method, in terms of ease of installation through the cheolgolbo simply mounted in a space defined in terms of the slurry month and only by placing the slab construction is completed, so there is an effect that the workability can be further improved compared to the conventional method. May slurry, underground continuous wall, backhand, top-down permanent struts, fillers