PURPOSE: To simply reduce frost heaving forces at low cost by a method in which a solid film is formed on the surface of a pile, and a part to reduce frost heaving forces acting on the pile by freezing of the active layer and seasonal frozen layer is additionally provided to the pile.
CONSTITUTION: A solid film 1a of uniform thickness is formed on the surface of a pile 1 over a longer range than the thickness of an active layr 6 preferably. A covering part 11 of the pile 1 is provided with a bellows-shaped expandible part 12 on its intermediate portion, and cylindrical portions 13 and 14 on its upper and lower parts. The upper cylindrical portion 13 is fixed to the pile 1 by a fixer 15 above the ground as much as possible and also the lower cylindrical portion 14 is fixed to the pile 1 by a fixer 16 in the boundary between the active layer 6 and the permanent frozen layer 5 or below the boundary in a water-tight manner. A fluid substance 17 is packed into the space between the solid film 1a of the pile 1 and the covering part 11.
NAKAGAWA SHIGERU
TAKEDA TAKASHI
OOMORI KATSUMI
OOKUMA TOSHIYUKI
| JPS608728U | 1985-01-22 |