GROUND ANCHOR AND PENETRATION METHOD THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a ground anchor capable of securely penetrating into a ground without disturbing the ground due to the rotary force and obtaining a large reaction. SOLUTION: A spiral blade 3 is attached to an anchor shaft 2 so that the angleαcrossing a plane P orthogonal to the axial line of the anchor shaft 2 ranges 90 deg.>α>45 deg..