BUILDING METHOD OF WATERTIGHT SCREEN IN BUILT-UP AREAS Russian patent published in 2009 - IPC E02D29/00 

FIELD: construction industry.

SUBSTANCE: method of building the vertical injection watertight screen under available structures involves building of vertical injection wells. In the built-up area there made are horizontal wells that are located in one vertical plane with a pitch height-wise which is set depending on permeability of rocks being plugged. Length of horizontal wells exceeds width of the structure crossed with screen so that they can go beyond the contours of structure and can ensure attachment of screen to its continued part. Horizontal injection wells are made of a vertical shaft arranged at the depth that exceeds the depth at which there are rocks being plugged, which is required for building of a water collector. Curing mixtures with various viscosity degrees, which are chosen considering filtration characteristics of water-saturated rocks and corrosive nature of ground water, are used as fixing agents. In order to prevent underflooding process in the built-up area on the outside of screen, radial drain wells are arranged from the shaft having been installed in the direction of structures being protected, and water entering the shaft is pumped over to collecting system.

EFFECT: preventing the processes of ground backwater on the outside of screen and underflooding of the object, preventing softening and reduction of strength performance of load-carrying soils of soil foundation of the structure in the area of watertight screen construction.

1 dwg