Journal of The Japan Forest Engineering Society
Online ISSN : 2189-6658
Print ISSN : 1342-3134
ISSN-L : 1342-3134
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Volume 26, Issue 1
Displaying 1-10 of 10 articles from this issue
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  • A study on methods for removing a hung-up tree by skidding at its butt end(<SPECIAL ISSUE>Work environment and safe management in forestry)
    Shiro TATSUKAWA, Shintaro ASOU, Isao SAWAGUCHI
    Article type: Article
    2011 Volume 26 Issue 1 Pages 15-20
    Published: January 31, 2011
    Released on J-STAGE: April 04, 2017
    DOIhttps://doi.org/10.18945/jjfes.KJ00007112672
    JOURNAL OPEN ACCESS
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    We investigated the effectiveness of methods for removing a hung-up tree by skidding at its butt end from measurements of tensile force that were taken during skidding in a 25-year-old Cryptomeria japonica stand. Three methods were examined: skidding on the ground (method A), skidding with a small metal sled (method B), and skidding on bamboo logs (method C). The average tensile force required to skid the butt end was 349N for method A, 320N for method B, and 172N for method C. Thus, tensile force was 49-53% lower for method C than for methods A and B. There was little difference among the average values of the maximum moving distance, which were 3.0m for method A, 2.5m for method B, and 2.6m for method C. The force required to remove a hung-up tree was 1,107N to push it down in the felling direction and 69N to rotate down the tuck. In contrast, it was 88N for method A, 78N for method B, and 39N for method C. It was concluded that method C was effective for reducing physical work load.
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