SPACED-FILLED TAMPING Russian patent published in 2010 - IPC F42D1/08 

FIELD: mining.

SUBSTANCE: spaced-filled tamping consists of section above charge of ES (explosive substance) or air interval filled with loose material; metal spacing tamping is located above this section; tamping is made, for example in form of hollow cylinder cut along axis wherein hollow spacing cone is inserted from beneath. The tamping out of inert material is filled from top onto the metal spacing tamping at height not less, than three diametres of a borehole. The section above charge or air interval is filled with loose material at height of diametre of the borehole.

EFFECT: increased efficiency of explosive rock breaking due to blockage of products of detonation in charge cavity and elimination of metal tamping escape from borehole after destruction of rock around it.

7 dwg