THERMAL PILE Russian patent published in 1995 - IPC

FIELD: civil engineering. SUBSTANCE: thermal pile is made of upper section 1, medium section 2, and lower section 3. Diameter of medium section 2 is less than ones of the upper and lower sections by a factor of 2 3. Upper section 1 is dipped into soil up to the level of active layer 11. Height of lower section 3 equals 0.3 0.5 one of the medium section. Medium section 2 has external ribs 10 and butted to upper section 1 through ring 4 with distributor of coolant liquid phase, and to lower section 3 through ring 6 with internal conical surface. EFFECT: increased work efficiency. 3 cl, 4 dwg