METHOD TO INSTALL ANCHOR AND DEVICE FOR ITS REALISATION Russian patent published in 2011 - IPC E21D20/00 E21D21/00 

FIELD: mining.

SUBSTANCE: method of anchor installation includes drilling a blast hole in a mine wall, insertion of a spiral into it, as well as an anchor rod with a helical groove at the external surface and impression of the spiral turns into the blast hole walls. At the same time at first the spiral is inserted into the blast hole, and then the anchor rod is screwed into it, deforming the cross section of the spiral turns as they are impressed into the blast hole walls. Dimensions of the anchor rod are selected such that the cross section of the spiral turns in the initial condition is more than the distance between the blast hole walls and the bottom of the helical groove of the anchor rod.

EFFECT: increased reliability of anchor adhesion to blast hole walls.

8 cl, 3 dwg