Results of the pulling down test of small SUGI (Cryptomeria japonica) trees

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  • スギ小径木の引き倒し試験の結果
  • スギ ショウケイボク ノ ヒキタオシ シケン ノ ケッカ

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Abstract

Small standing trees are often used for the spar or anchor of logging cable way especially in thinning operation. It is necessary to know the strength and rigidity of standing trees beforehand for safe setting of the cable way. For this purpose we carried out the pulling down test of small SUGI (Criptomeria japonica) trees and obtained the relation between moment of pulling force and stem inclination. 1) The magnitude of moment of pulling force about point 0 can be calculated by formula (1). 2) The moment reaches maximum where stem inclination is about 10 degrees. 3) The maximum moment is approximately proportional to the cube of D.B.H. 4) In case of larger tree the moment decreases rapidly after passing its peak. On the other hand, the moment of small tree keeps rather high value at larger inclination angle.

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