METHOD FOR DRILLING AND BLASTING OPERATIONS Russian patent published in 1999 - IPC

FIELD: mining operations accomplished, for example, at destruction of oversized stones, constructions of stone, brick, concrete, breaking of block rubbles, tunnel driving, applicable in the process of mining of mineral resources. SUBSTANCE: the method consists in placement, sealing of a change containing reagents with detonationless decomposition or burning reaction in a blast-hole (well) and excitation of reaction in it accompanied by liberation of gases; prior to placement a charge, the blast-hole is hermetically sealed by placement of gas-proof material along the entire surface of the blast-hole in the form of an elastic shell, tube or other similar moulds, providing at introduction into the blast-hole for a tight fitting of material to its surface; the gas-proof material is introduced into the blast-hole by means of a pusher. Use may also be made of stiff gas-proof components, for example, in the form of hollow cylinders with a blind bottom. Rubber, latex, low-modulus polymeric material and metal, as well as materials of other similar groups may be used as gas-proof material. The main requirement to them is their gas-proofness. The material may be elastic. In this case expansion of the component made of such a material facilitates its introduction into the blast-hole. At use of elastic material the component restores its shape on completion of operation of introduction into the blast-hole. EFFECT: facilitated procedure. 11 cl, 2 dwg