CRIB FOR PROTECTION OF STOPES Russian patent published in 1997 - IPC

FIELD: mining industry; applicable in protection of stopes on flat and inclined mineral seams up to 2 m thick. SUBSTANCE: the offered crib includes column from oblong bars installed by pairs over periphery of crib with binding at right angle of each pair at edges with two adjacent pairs. Crib in its central part has hollow into which internal forms is introduced, for instance, in form of flexible inflatable shell. External shell has holes to receive pipe union. Only empty spaces between wood members and empty space corners are filled with cementing material by means of hose connected to pipe union. EFFECT: higher efficiency. 2 dwg