EARTH ROAD BED ON PERMAFROST BASE Russian patent published in 2000 - IPC

FIELD: construction engineering; construction and reconstruction of linear structures on permafrost ground and marshes. SUBSTANCE: road bed has embankment, porous heat-insulating layer whose specific weight is lower than that of water, reinforcing coverage coarse-grain protective layer, and insulating spacer; heat-insulating layer is placed in reinforcing coverage and driven through active layer depth; protective layer is placed on reinforcing coverage for convective heat transfer; dust-proof insulating spacer is placed between protective layer and embankment. Road bed is noted for high stability ensuring that no hydrostatic water presser will be built up at its base in the course of its service due to provision for constant subzero temperature conditions. EFFECT: guaranteed safety of structure contributing to safe and uninterrupted traffic. 1 dwg