CARTRIDGE FOR DIRECTED BREAKING OF ROCKS Russian patent published in 2010 - IPC F42D3/04 

FIELD: blasting.

SUBSTANCE: breaking is carried out by periodic camouflet effect along charge length due to placement of explosives into water impermeable shell arranged with periodically varying diametre in the form of concave arch rotation surface in section along charge length,' besides, length of rotation arch chord ("Ш") is equal to two diametres of charge, diametre of narrow part of water impermeable shell (in m) makes where b = (21.25 ÷ 54)·D - distance between wells, m; D - diametre of charge, m; and radius of concave arch makes (in m)

EFFECT: invention makes it possible to increase efficiency of directed breaking of rocks.

1 dwg, 1 tbl