METHOD TO WIDEN ROAD STRUCTURE (VERSIONS) Russian patent published in 2015 - IPC E01C3/04 

FIELD: construction.

SUBSTANCE: invention relates to the field of road construction, in particular, to construction of road structures with an asphalt-concrete coating of non-stiff type. The method to widen a road structure includes arrangement of a roadside soil horizontal cut along the coating edge for the depth equal to thickness of the existing coating with its simultaneous removal to the slope of the road embankment, cutting of the edge perpendicularly to the coating plane or vertically at the value of not more than 100 mm, removal of fragments into a truck bucket for reuse, erection of a vertical slurry wall from extracted metal sheet piles, tightly adjacent to the upgraded edge of the coating, at the same time the lower ends of the piles are embedded into the active layer of the compacted soil base for sufficient depth, and upper ends of piles with holes rise above the level of the horizontal bottom of the roadside soil cut by minimum height sufficient for placement of a lifting mechanism grip. Then along the slurry wall they remove roadside and embankment slope soil removal to the bottom of the road surface, and here they arrange the active layer of the soil base of recommended thickness for the rated value of widening with layerwise compaction of soil to maximum density at optimal moisture. On the active layer they arrange all structural layers of the road surface from materials that are similar to materials of the old road surface by quality, thickness and extent of compaction. Then a new coating is arranged, which adjoins along the plane to the old coating, similar to it, and then a protective layer of the asphalt-concrete layer along the complete width of the strengthened surface with displacement of the road axis, if necessary, by profiling. The process is completed with soil filling to the roadside and its compaction. In the second method of road structure widening they use non-removable reinforced concrete sheet piles for erection of a slurry wall in the same place without their stagewise removal in arrangement of road surface layers, leaving upper ends of piles at the level of the horizontal bottom of the roadside soil cut, and then they are coated by coating layers.

EFFECT: guaranteed preservation of bearing capacity of existing road surface and provision of possibility to let through traffic along the road without construction of a roundabout route helping to lower cost of road and repair works, increased overhaul periods with preservation of its high transport-operation indices for a long period of time.

2 cl, 6 dwg