head office building (Steel structure).First, we will create a closed space that can be dismantled by effectively utilizing the structure on the top floor without breaking it. Then, a temporary pillar with a built-in jack is installed, and the dismantling floor is automatically lowered by the jack for each floor. By making the demolishing space a closed space, improvements can be made in terms of scattering/ falling parts, scattering of dust, noise, and vibration. A slide type overhead crane for horizontal transportation is installed on the top-floor frame, and the telpher for vertical transportation is installed on the floor opening, and the disassembled members are unloaded by the crane. In addition, the free fall energy of the dismantling material that occurs during unloading is used to generate electricity to achieve a thorough energy reduction. This method was first applied at the Otemachi Financial Center (Steel structure) in Tokyo in 2011, and subsequently applied at the Akasaka Prince Hotel New Building (Steel structure) in Tokyo in 2012, which became a sensation in Japan as a demolished skyscraper. It has also been announced that the Taisei Ecological Reproduction System, known as “Tecolep-Light system” in Japan is applicable to the super high-rise buildings made by reinforced concrete. This “Tecolep-Light system” was applied in 2019.This method was originally named as “the block Fig. 1 Practical Use of Kajima Cut and Down Method（2008）Fig. 2 Taisei Tecolep System─ 30 ─3. Taisei Corporation “Taisei Tecolep System” : Fig.24. Shimizu Corporation “Shimizu Reverse Construction Method” : Fig.3
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