METHOD FOR RECOVERY OF EXHAUSTED OPEN PITS FOR CONSTRUCTION OF STRUCTURES Russian patent published in 2010 - IPC E21C41/32 E02D17/08 

FIELD: mining.

SUBSTANCE: invention relates to mining and processing industries and may be used to recover disturbed lands in agriculture, construction and power engineering industry. Method consists in the fact that after open pit has been exhausted, its space is filled in layers first with construction waste, and then filled with overburden to the elevation of pit bottom for foundation of future structure, at the same time layer of overburden is leveled with a layer of sand having medium size with further compaction. Then future structure foundation axes are laid, as well as future solid reinforced concrete elements according to accepted design structural scheme relative to axes of foundations. Along each of laid longitudinal axes of future solid reinforced concrete elements, at the pit bottom panel forms are erected, evenly filled with concrete mix of grade not less than B 15 by quarter of panel form height, laid concrete mix is compacted by rodding, then reinforced frames are installed onto freshly laid concrete mix, and panel forms are fully filled with concrete mix. After concrete mix poured into panel forms gains strength, panel forms are removed, and space between produced longitudinal solid reinforced concrete elements is filled with crushed slag. Afterwards soil foundation is filled, which includes two layers: intermediate layer of dry mix of soil and crushed slag, and above a layer of crushed stone from solid rocks of medium size to the elevation of foundation level of constructed structure, besides soil foundation thickness equals height of cross section of longitudinal solid reinforced concrete elements, and thickness of intermediate later from mix of soil and slag stone makes one third of foundation level thickness, besides, the last level is flattened and compacted, and then foundation is erected.

EFFECT: reduction of labour expenses and cost of recovery works.

2 cl, 3 dwg