METHOD FOR FORMATION OF ARTIFICIAL PILLAR AND DEVICE FOR ITS REALIZATION Russian patent published in 1994 - IPC

FIELD: mining industry. SUBSTANCE: roof rocks are caved by making undercut hollows, filling material is supplied with delay when driving hollows. Supply of filling material and driving of undercut hollows are discontinued when longitudinal displacement of material of pillar mass is detected, and the operations are resumed after pillar pressing. Device has guard shield with deflecting plate, filling material supply mechanism with unloading head. Deflecting plate is made with unloading port and inclined at angle for creeping of filling material prism. Filling material supply mechanism is installed for arrangement of said head in unloading port during its motion. EFFECT: higher efficiency. 4 cl, 2 dwg