TUBING RING FOR ATTACHMENT OF VERTICAL SHAFTS OF MINE WORKINGS Russian patent published in 2011 - IPC E21D5/10 

FIELD: mining.

SUBSTANCE: device consists of number of metal tubings made in the form of cylindrical segments connected to each other through vertical sealing gaskets and holes along vertical edges by means of bolt connections to waterproof and hold-down washers. On outer surface of back of each segment there made are external circular and vertical stiffeners, and on inner surface there made are internal circular stiffeners forming internal caissons. In upper caisson of each tubing along central axis there made is backfill hole with reinforcement for threaded blanking plug. In lower stiffener of the above caisson there are two pairs of hoisting holes equally spaced from vertical symmetry axis of tubing, in the lower horizontal edge of which and inclined filling hole is made in triangular inset and coaxially to backfill hole. Threaded blanking plugs are installed in working position in backfill and filling holes.

EFFECT: higher speed and improved reliability of assembly process of support; strength under conditions of high rock pressures.

12 cl, 19 dwg