The demolition of high-rise buildings has thus far been carried out by starting from the upper stories and working downward to the lower stories. In the newly developed "jack-down method," jacks are installed just beneath the lst-floor columns, and the building is demolished beginning from the lowest story. Continuing upwards, the columns of each floor are cut and the floors are successively jacked down. In order to secure seismic safety during demolition, a reinforced-concrete "core wall" and a steel-structure "load transfer frame" are newly installed inside the building.
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