＊ Professor, Department of Architecture and Architectural Engineering, College of Industrial Technology, Nihon UniversityKeywords: Demolition, Reinforced Concrete Structure, Techniques, Transition, JapanWhen considering the history of demolition, we have to accept that there are very few written records regarding demolition until about 1965, except for summarized stories of those affiliated with an architectural job. Contrary, there is a long-written history of wooden construction as well as records of the application of reinforced concrete on newly built constructions. In addition, it was after 1955 (Showa Year 30) when the full-scale demolition of a reinforced concrete construction was carried out.The demolition of reinforced concrete structure started with the use of chipping method in the 1950s. Although demolition of chimneys was carried out during the World war II, the demolition of reinforced concrete structure started much later than the new constructions that were built after World War II. A chipping hammer in Japanese is called, Gen-no which is a large hammer with both hands that weights from 5 to 20kg. Fig. 1 Transition in Reinforced Concrete Structure Demolition Method（Received February 27, 2021）─ 35 ─日本大学生産工学部研究報告Ａ2021年 12 月 第 54 巻 第 ２ 号1. Introduction2. Outline of Demolition for a Reinforced Concrete StructureDocumentNoboru YUASA＊The Transition of Demolition Techniques for Reinforced Concrete Structure in Japan
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