METHOD FOR DRIVING UNDERGROUND WORKING AND ITS FRAMED SUPPORT Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: according to method, contour of cutting face is formed. Rectilinear part of cutting face is located over loosened contact and occupies not over 1/2 of width of underground working. Position and dimensions of rectilinear and curved parts are determined experimentally. Framed support for realization of method has side members 1, 2. They are of curved-rectilinear configuration and are connected together by rectilinear parts 5 for forming of rectilinear section. Length of this section is no less than 1/3 of underground working width. One of upper beam members at side of seam rising is provided with clamps 6. Side members are installed in working at incline relative to its longitudinal axis. EFFECT: high efficiency. 2 cl, 4 dwg