SUSPENDED BOREHOLE PLUG Russian patent published in 2009 - IPC F42D1/08 

FIELD: mining.

SUBSTANCE: suspended borehole plug is implemented in the form of cylinder, diametre of which is commensurable to diametre of well. Cylinder is implemented as solid, installed into borehole at the depth if massif with intensive cleat. Bottom butt of cylinder is implemented as inclined, and top is affixed by string to crossbeam, located over wellhead.

EFFECT: invention provides to intensify rock crushing process, to reduce unit discharge of BB, to increase quality of rock crushing, to simplify design.

1 ex, 2 dwg