METHOD OF FOUNDATION BED CONSTRUCTION BY HORIZONTAL REINFORCING WITH PRECAST CONCRETE COMPONENTS Russian patent published in 2009 - IPC E02D27/01 

FIELD: construction.

SUBSTANCE: invention relates to foundation construction technologies, and particularly, to reinforcing technology used for compressible foundation sections of detached or slab-shaped foundations in building and structures being erected under severe engineering and geological and hydro-geological conditions. Method of foundation bottom construction by horizontal reinforcing with precast concrete components includes foundation pit mining and installation of horizontal stiff lengthy elements such as crossties. As soon as the foundation pit is developed to the designed depth and is bladed, the foundation pit bottom is leveled and filled with sand or crushed stone generating underlying layer with the designed thickness being no less than 0.05 m. Then this layer is leveled and compacted. After that, foundation axes and longitudinal axes of crossties are broken down regarding foundation axes and against the established construction layout depending on the foundation type of the structure being built. The crossties are laid down above the underlying layer in such a way to produce crosstie distribution element in the compressible section in accordance with the designed construction layout of longitudinal crosstie axes with regard to foundation axes. The crossties are installed so that their beds coincide with the level of underlying layer of foundation pit. In addition, crossties are installed butt to each other so that total length of each crosstie exceeds the distance between the external shapes of the utmost foundation edges of the building. The crossties are laid parallel to each other at the design distance so that the area of crosstie distributing element overlaps foundations area completely. Then, inter-crosstie space is filled with sand and buffer layer is laid from above to the level of foundation bed installation with sand, crushed stone from solid rocks or crushed stone from ferrous metallurgy wastes. The buffer layer thickness must not be less than 1/3 of crosstie width or cross section diameter. Maximum size of crushed stones must not exceed 1/5 of crosstie width or cross section diameter. The foundation pit is mined to the design depth, which is equal to sum of future foundation bed depth, buffer layer thickness, crosstie cross section height or diameter and underlying layer thickness.

EFFECT: improvement of soft ground foundations bearing capacity and reduction of material consumption.

2 cl, 4 dwg