collapsing ensures the safety of the cut parts against earthquakes during demolition work.This is a construction method in which a mobile demolition factory “hat” that covers the surrounding area is installed at the top of the building and the buildings are demolished sequentially while moving to the lower floor. Inside the hat, demolishing equipment including an overhead crane is installed integrally, and it descends without a gap while wrapping the building frame to be demolished. All demolishing materials are lowered through the inside of the building. Therefore, it is safer and more environmentally friendly compared to the conventional method.Since the cutter and wire saw are used to cut into blocks in the hat, diffusion of dust and noise can also be reduced. The demolished block is taken down from inside the building by an overhead crane, so there is no risk of parts falling down to the surroundings, which is effective for construction in urban centers. In 2012, this method applied to the demolition of former hotel plaza in Osaka (1st-4th floor SRC construction, 5th- 23rd floor S construction, RC construction underground, height 88m (289 ft)). It is also applicable when the high-rise part is made of RC. The photographs, original drawings in Japanese, and contents in this document have been approved by the proposing company. I would like to thank each company.This paper is an extended version of published without examination in Japanese1)1) Noboru YUASA: Demolition of Skyscrapers in japan, Summary of research reports related to demolition work, Japan Demolition Contractors Association, PP.17-18, 2020.8Fig. 5 Takenaka Hat Down Method ─ 32 ─6. Takenaka Corporation “Takenaka Hat Down Method” : Fig.5AcknowledgmentsDisclosureReferences
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