METHOD TO REPAIR ROAD SECTIONS FROM PULVERESCENT, WATERED SOILS Russian patent published in 2012 - IPC E01C3/04 

FIELD: construction.

SUBSTANCE: method of repairing road sections from pulverescent, watered soils relates to repair of roads, takeoff and landing strips from water-logged, pulverescent soils, and may be used in northern regions characterised by availability of soils with deep seasonal freezing or permafrost soils, high levels of ground waters, arrangement of road works preferably in summer periods of the year. The invention provides for reinforcement of pulverescent watered soils with "heavy" oil while maintaining industrial and environmental safety of developed routes and adjacent natural facilities. When repairing the roads after melting of an earthfill, subsidence of a gravel layer, an asphalt concrete (concrete) cover, using a portable drilling rig, wells are tunnelled with depth of 0.7…1.2 m, diameter of 63…108 mm. Low-viscosity "heavy" oil is injected into wells under pressure exceeding the regular one by 20…80%, gravel is added, and the asphalt concrete cover is restored. When repairing road sections damaged by frost heaving (heaving mounds), using a portable drilling rig, wells are tunnelled with the depth exceeding seasonal freezing of road earth fill soils. Then heated oil is injected into wells under excessive pressure, and the gravel layer is restored, as well as the asphalt concrete cover.

EFFECT: reduced costs for repair of roads, higher quality and timing of repair works during operation of roads under complicated natural and climatic conditions.

2 cl