METHOD AND DEVICE FOR GROUND CRUSHING FOR OUTBURST Russian patent published in 2007 - IPC F42D3/00 F42B3/08 

FIELD: blasting operations, in particular, methods and devices for ground crushing for outburst for extraction of objects.

SUBSTANCE: a charge chamber is installed in the ground above the object to be extracted so that the end of the elongated shaped charge located in the charge chamber composes an angle of 3 to 15 deg with the ground surface, the charge hollow is directed towards the ground surface. The elongated shaped charge in the form of an opened tore with a mean diameter of 1 m is placed in the charge chamber. Initiation is accomplished from the elongated shaped charge side opposite the charge hollow with the aid of an initiation unit that consists of a low-voltage electric detonator and an intensifying charge made of a plastic explosive compound. On the side of the charge hollow the charge chamber wall is installed with a clearance with respect to the end face of the shaped charge, and the wall thickness on this side is minimum. Clearance δ is selected from the following relation 1.5 d≥δ≥0.9 d, where d - the diameter of the shaped charge.

EFFECT: enhanced efficiency of crushing, simplified extraction of the object by producing the directivity of the ground outburst at simultaneous reduction of the negative affect of the explosion products of the object being extracted, reduced cost of the equipment at a safe handling.

4 cl, 3 dwg