A STUDY ON THE SAFETY SEPARATION DISTANCE AGAINST FALLING OBJECTS AT THE TIME OF CONSTRUCTION

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  • 建設時の落下物に対する安全離隔距離に関する研究

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 Labor safety and health regulations include provisions on preventing danger due to falling objects, and prescribe equipment to prevent objects from flying in. In particular, specific regulations are set forth in Article 136, Paragraph 5 of Enforcement Orders for the Building Standards Act. The Guidelines on Measures to Prevent Public Disasters in Construction Work (Public Works Volume) of the Ministry of Land, Infrastructure, Transport and Tourism require measures such as prohibiting entry over a range of 75 degrees or more of elevation from the location where work is done. In other words, the area outside that range is regarded as a safe separation distance. However, this distance was checked with the Technology Investigation Section, Planning Department, Kanto Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism, and, as a result, it was found that the grounds for the distance are unclear, and there is no prior research. The purposes of this paper were to carry out demonstration experiments to clarify grounds for provisions suited to the actual situation during construction, and thereby show the validity of the provisions in Article 101 of the Guidelines on Measures to Prevent Public Disasters from Construction Work, and elucidate the mechanisms of flying distance. The results clarified the following mechanism: When an object falls freely, a double-trigger effect may occur due to collision once with the scaffolding baseboard, and while it continues to fall, the force of the baseboard trying to bend back, and due to collision with the crosspiece and the force pushing out due to bending of the single pipe made of metal. In this way, a large horizontal velocity can be produced, resulting in a flying distance greater than that usually encountered.

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