METHOD OF FORMATION OF HAULAGE RAMP Russian patent published in 1998 - IPC

FIELD: mining; applicable in formation of haulage berms. SUBSTANCE: the offered method includes excavation of inclined permanent trench with its passing into working trench, widening it in retreat with preliminary sloping of bench, formation of flank on the given level and completion of all members of transverse profile. Beginning of permanent trench is displaced for the value of lead of cutting-in of new level. After formation of flank on the given level, rock protective pillar is outlined on the side of roadway, and muck is cleaned through the design depth. EFFECT: reduced labor input in formation of haulage ramp due to decrease of its width. 3 dwg