METHOD OF ENSURING ACCESS TO UNDERGROUND FACILITY Russian patent published in 2017 - IPC E21D9/06 

FIELD: mining engineering.

SUBSTANCE: method involves forming an oriented cavity with a screw-turning unit in the forward direction when it rotates in one direction, cutting the helical grooves and three longitudinal radial channels, evenly distributing them in the plane of the cavity cross-section, in the border zone of the cavity in a mass of surrounding rocks, maintaining the goaf by support setting with embedded elements installed in the radial channels. The cavity is fixed with an annular frame support with a lattice lacing of the interframe space. At the end of the formation of the oriented cavity, the cutting body of the screw-turning unit is dismantled and transported to the beginning of the formed cavity. One set of the ring support is dismantled and transported to the beginning of the cavity. The screw-turning unit is rotated in the opposite direction and moved backward by a support setting pitch, then, in the section of the cavity between the face and the screw-turning unit, the embedded elements are installed in the radial channels, the screw support is mounted, the elements of which are attached to the embedded elements.

EFFECT: reduction of the surface area required to provide access to the underground zone.

2 cl, 6 dwg