ANCHOR (VARIANTS) Russian patent published in 2007 - IPC E21D21/00 

FIELD: mining industry, possible use for strengthening mines.

SUBSTANCE: anchor includes destructible bushing consisting of particles of given dimensions, shape and strength, connected by linking substance, strength of which is less than strength of aforementioned particles. Destructible bushing is reinforced with rods. An end cap is mounted on the end of destructible bushing. Hollow of destructible bushing is filled with hardening substance, which expands during hardening. In second variant, as opposed to first, a pipe made in form of sheet, convoluted to a spiral, is positioned inside destructible bushing. An end cap is mounted on the end of pipe. Pipe is filled with hardening substance, which expands during hardening. In accordance to third variant, anchor includes destructible bushing. Its components are connected along longitudinal planes by linking substance, strength of which is less than strength of material of parts of destructible bushing. An end cap is mounted on the end of destructible bushing. Hollow of destructible bushing is filled with hardening substance, which expands during hardening.

EFFECT: increased efficiency due to lower laboriousness of installation and increased reliability of connection due to even engagement with well walls along whole length.

3 cl, 8 dwg