ROAD STRUCTURE Russian patent published in 2009 - IPC E01C3/06 

FIELD: construction.

SUBSTANCE: invention is related to structures for protection of road carpet soil foundations against overwetting. Road structure including coat, foundation, draining layer, earth bed, lean-to cross catching drain installed on concave section of vertical curve, top of which is located on project line of earth bed, comprising perforated drain tube with tubular extensions to slopes of earth bed, and filtering coarse-grain material installed within the limits of draining layer and below by foundation width. Interruption of filtered water is done by arrangement of catching drains at borders of sections with slopes, which provide for efficient drying of draining layer on top sides, and distance from curve top to borders of sections is defined by product of curve radiuses to border slopes.

EFFECT: preservation of stable strength in period of structure thawing in sections of concave vertical curve, top of which is located on project line of longitudinal profile of road, and sections are limited by opposite slopes of at least two ppm, and also prevention of water supply to concave section, and therefore, provision of stable strength of structure.

3 dwg