CABLE ROOF BOLTING OF HIGH LOAD-BEARING CAPACITY Russian patent published in 2014 - IPC E21D21/00 

FIELD: mining.

SUBSTANCE: there proposed is an anchoring rod that consists of three cables, each of which in its turn consists of several strands twisted between themselves. Note that inside the rod along its whole length between the cables there are mounted bracings, above which there fixed are the bands pressing the cables to the bracings. At the bottom-hole end of the anchor rod there made is an expansion unit. At the tail end of the anchor there is a shank with three holes of cylindrical shape becoming conical at the bottom, in which there attached are the cables in cutting wedges manner, and at the external surface of the shank there is a thread for tension nut. There is a binding mixture supply tube passing through the shank centre, and at the shank top there is a supporting washer. The supporting washer has a side hole, through which there supplied is a sealer and air discharge tube goes out; the air discharge tube also goes between two cables of anchor rod up to its top part. Between the tension nut and supporting washer there is an insert of semi-spherical shape without internal thread.

EFFECT: increase of stability and safety of mine workings fixing.

3 dwg