METHOD FOR BLASTING OF BENCHES IN HINDERED CONDITIONS Russian patent published in 2008 - IPC F42D5/05 F42D1/08 

FIELD: mining industry, in, development of hard rock masses in hindered conditions, when the throw-off of the exploded rock mass only under the high wall is probable and it is necessary to prevent the spread of pieces upward and on sides, at separation of the flanks of deep rock extraction in highway engineering, blasting operations near electric power lines, etc.

SUBSTANCE: the method for blasting of benches in hinged conditions consists in drilling of blast bore-holes, charging of them, placing of a mat composed of interconnected automobile tires on the bench surface, fastening of it to tie rods installed in not deep bore-holes with the aid of rope or thin chains, and blasting of the rocks. The shelter is placed on the bench surface only and made of two layers, to this end, the mat is composed of worn-out automobile tires with a shift of adjacent rows by half of their diameter, it is placed on a metal net, and the bore-hole charges are made with an air cushion in the lower part, for example, of foam polystyrene.

EFFECT: enhanced safety of blasting operations due to prevention of spread of the rock pieces at blast loosening of rocks in all directions, except the high wall, due to the use of a shelter and a special explosive charge construction.

4 dwg