短 報 (Note)
小径木の根株強度について
上村巧・伊藤崇之・広部伸二・田中良明・毛綱昌弘・飯田富士雄
Stump Holding
Power of Small Trees
UEMURA Takumi, ITOU Takayuki, HIROBE Shinji, TANAKA Yoshiaki, MOZUNA Masahiro and IIDA Fujio
Abstrast
Usage of young trees as anchors of yarding operations was
discussed. Maximum stump holding power of three species (Larix kaempferi, Cryptomeria japonica and
Chamaecyparis obtusa) were measured in Yamanashi prefecture, and the
relationships between the inclining angles of the stumps and pulling power were
analyzed by a 3D motion analyzer. The stump holding power correlated closely
with square of the stump diameters. The inclination with which the stumps show
the maximum holding power ware ranged 4− 6 degrees. It was concluded that the stumps have lost the
function as an anchor when the inclinations were so large that they could be
observed.
Key words : stump
anchor, stump holding power, inclining angles of stumps
全文情報(256KB)