ANCHOR BOLT WITH MECHANICAL ANCHOR Russian patent published in 2012 - IPC E21D21/00 

FIELD: mining.

SUBSTANCE: proposed group of inventions refers to mining operations, and namely to anchor bolts to support the roof and walls at tunnel construction. Anchor bolt includes a shaft and anchor device containing a mandrel and at least one expanding element covering the mandrel. Besides, at least one mandrel or at least one expanding element are made so that they can be rotated about the shaft and can move axially along it. At least one expanding element is made so that it can be displaced radially outwards with specified relative movement between mandrel and at least one expanding element. Besides, shaft includes the first and the second sections to arrange the moving element. When the arrangement is performed in the first section of the shaft, rotation of the moving element relative to the shaft causes the axial movement of that element along the shaft, and when the arrangement is performed in the second section of the shaft, the moving element is installed with possibility of being rotated on the shaft without deviation with axial movement along the shaft.

EFFECT: improvement of operating reliability of anchor device and reinforcement of mine working owing to providing reliable connection of anchor to mine rock.

33 cl, 5 dwg