THRUST STEMMING Russian patent published in 2006 - IPC F42D1/08 

FIELD: drilling and blasting operations in hard rocks at open pit mining, applicable in various branches using spare blasting operations and blasts under a shelter in hard rock masses.

SUBSTANCE: the thrust stemming is made in the form of a metal cylinder having a tapered expansion with several rows of shoulders from the outside in the lower part and at least three longitudinal slots inserted in which is a metal thrust cone with an inner cavity, provided with a tubular tie-rod with a thread on the upper end, freely passing through the axial channel of the bearing ring positioned above the cylinder.

EFFECT: enhanced efficiency of blasting crushing of rocks due to locking of the detonation products in the charge cavity of the thrust stemming up to the moment of complete destruction of the environment.

2 dwg