SUSPENDED WELL STEM Russian patent published in 2011 - IPC F42D1/08 

FIELD: mining.

SUBSTANCE: suspended well stem is arranged in the form of a solid cylinder, diametre of which is approximated and comparable to the well diametre to the maximum. The cylinder is installed at the depth of the massif with intensive cracking. Between a charge and a stem there is an air gap. The upper and lower ends of the cylinder are arranged as truncated in parallel to each other, besides the length L of the large axis of the formed ellipse equals 1.15-1.25 of the well diametre, besides, the upper end is fixed to the crosspiece arranged above the well head with a rope fixed near the lower edge of the truncated part of the stem.

EFFECT: invention makes it possible to use the energy of explosion products to the maximum, to intensify the process of rocks grinding, to reduce the specific weight of explosives, to increase quality of rock mass grinding, to increase reliability of the well stem, to simplify its manufacturing.

3 dwg