METHOD OF REDUCING EFFECT OF TANGENTIAL FROST HEAVING FORCES ON PILE FOUNDATIONS Russian patent published in 2024 - IPC E02D27/35 

FIELD: construction.

SUBSTANCE: invention relates to construction, namely to foundations and supports of various structures erected on thawed soils with an upper seasonally freezing layer of heaving soil and on permafrost soils with an upper seasonally melting layer of heaving soil. Method of reducing the effect of tangential frost heaving forces on pile foundations by slowing down the process of freezing of soil around the pile is characterized by the fact that the pile is made as a tubular metal hollow for the entire height or as a composite with a tubular upper part within the heaving layer. Cavity formed by pile walls and strong partition, which is arranged inside the pile at the level of the boundary of seasonal freezing or seasonal thawing, is filled with fresh water to the level of the day surface through the filling nozzle with a cover, located on the side surface of the above-ground part of the pile, and the required water level in the cavity is controlled and maintained by means of a control nozzle with a cover located on the pile wall at the level of the day surface. After establishment of negative temperatures of external air in process of water freezing in cavity heat of phase transition of water is released, which along the pile walls, having high thermal conductivity, continuously enters the soils surrounding the foundation, as a result, the boundaries of water freezing in the cavity and the surrounding pile soil lag behind the boundary of the natural freezing of the soil, moisture migration from the thawed zone to the freezing front reduces the heaving of soils in the layer adjacent to the pile surface, and maintaining a higher temperature of the wall of the pile and adjacent soil reduces the forces of freezing of the soil with the surface of the foundation, wherein the above-ground part of the pile is thermally insulated to slow down the process of freezing of the soil.

EFFECT: reduced effect of frost heaving on pile foundations as a result of reduction of soil heaving, adjacent to the pile surface, and forces of adfreezing of this layer with the side surface of the pile.

1 cl, 1 dwg