Journal of Japan Society for Safety Engineering
Online ISSN : 2424-0656
Print ISSN : 0570-4480
ISSN-L : 0570-4480
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Volume 61, Issue 1
JOURNAL OF JAPAN SOCIETY FOR SAFETY ENGINEERING_2022_1
Displaying 1-18 of 18 articles from this issue
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PROPOSAL FOR SAFETY
REVIEW
ORIGINAL PAPER
  • Fundamental Analyses on Industrial Accidents in the Construction Industry
    Satoshi Tamate
    2022 Volume 61 Issue 1 Pages 35-44
    Published: February 15, 2022
    Released on J-STAGE: February 15, 2022
    DOIhttps://doi.org/10.18943/safety.61.1_35
    JOURNAL FREE ACCESS
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    This study summarizes recent records of labor accidents in the construction industry as well as all industries. The number of occupational accidents in the construction industry had decreased to 1/10th between 1961 and 2020. In addition, accident frequency rate in the construction industry shows a drastic decrease of 1/60 between 1954 and 2018. Since the value of the fatality ratio in the construction industry reaches 4.5 times to that in all industries, however, problem of high fatality still exists in construction industry. From analyses of fatal accidents in construction industry between 2014 and 2018, a category of temporary facilities, buildings, structures, etc shows a high ratio of occurrence in cause of accident in comparison with all industries. Moreover, similar accidents induced by construction machineries and mobile cranes were distributed in several categories of falling to a lower level, falling on same level and being struck by object. This study indicates that a several sets prevention measures should be carried out together to reduce the potential risk of reaching damage to personnel.

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  • Measurement of Spray Electrification of Acetic Esters and Investigation of Antistatic Method
    Yuta Endo
    2022 Volume 61 Issue 1 Pages 45-52
    Published: February 15, 2022
    Released on J-STAGE: February 15, 2022
    DOIhttps://doi.org/10.18943/safety.61.1_45
    JOURNAL FREE ACCESS
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    Electrostatic charging during handling of liquids can be a cause of fire in hazardous material facilities. IEC TS 60079-32- 1:2013 points out that ethyl acetate and isopropyl acetate are strongly charged. Other acetic esters similar in structure to these can be strongly charged as well. In this study, we measured the charge generated by the spray electrification of four types of acetic esters （methyl acetate, isopropyl acetate, ethyl acetate, and butyl acetate） and evaluated these hazards. As a result, the specific charges of the four acetic esters were more than 5 µC/kg, which is larger than the specific charges of various liquids in previous studies. It was also confirmed that these liquids can cause fires even with small amounts of spray. We also confirmed that the charge of the highly conductive liquid with conductivity 10-6 S/m or higher was greatly reduced when electrodes were attached to the spray nozzle and a voltage was applied to the electrodes.

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TECHNICAL REPORT
SAFETY MANAGEMENT AND PROVISIONS IN THE CORPORATION
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