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Volume 29 (2003)
- Issue 6 Pages 248-
- Issue 5 Pages 192-
- Issue 4 Pages 137-
- Issue 3 Pages 90-
- Issue 2 Pages 42-
- Issue 1 Pages 2-
Volume 29, Issue 6
Displaying 1-6 of 6 articles from this issue
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[in Japanese]2003 Volume 29 Issue 6 Pages 248-252
Published: November 25, 2003
Released on J-STAGE: May 22, 2009
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Hatsuo MACHIDA, Norie MOTEKI, Hidetoshi ITO2003 Volume 29 Issue 6 Pages 253-258
Published: November 25, 2003
Released on J-STAGE: May 22, 2009
JOURNAL FREE ACCESSA deterioration survey and bending strength test were carried out on thinned softwood logs used as shock absorbing pads of a debris fall defense hedge.
As the result of the annual deterioration survey of logs measured by PILODYN, it was found that the logs greatly deteriorated for 3 to 4 years, especially in certain places where they were installed. The striking depth PILODYN value of logs placed in the third or fourth layer in the pad was almost the same as that of logs touching the steel frame of the defense hedge. Thus, the thickness direction of the pad had little effect on deterioration. On the other hand, the striking depth value of the logs was influenced by the longitudinal direction, decreasing from the butt end to the center.
The bending strength of the logs was 85% after 2 years, and 20% after 5 years. A negative correlation was recognized between the striking depth value and the gap fraction of the forest behind the defense hedge.View full abstractDownload PDF (2829K) -
[in Japanese], [in Japanese]2003 Volume 29 Issue 6 Pages 259-262
Published: November 25, 2003
Released on J-STAGE: May 22, 2009
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[in Japanese]2003 Volume 29 Issue 6 Pages 263-267
Published: November 25, 2003
Released on J-STAGE: May 22, 2009
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[in Japanese], [in Japanese]2003 Volume 29 Issue 6 Pages 268-272
Published: November 25, 2003
Released on J-STAGE: May 22, 2009
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[in Japanese]2003 Volume 29 Issue 6 Pages 273-275
Published: November 25, 2003
Released on J-STAGE: May 22, 2009
JOURNAL FREE ACCESSDownload PDF (2869K)
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