Longwall roof support POWERFUL steeply inclined coal seam

摘要

u0441u0435u043au0446u0438u00a0 upon treatment u0437u0430u0431u043eu00a0 powerful u043au0440u0443u0442u043eu043du0430u043au043bu043eu043du043du043eu0433u043e coal-bed, u0441u043eu0434u0435u0440u0436u0430u0449u0430u00a0 overlap with a visor, the base and two support beams (upper and u043du0438u0436u043d yoo) and u0441u043du0430u0440u00a0u0434u0430u043cu0438 set in parallel to each other and u0441u0432u00a0u0437u0430u043du043du044bu0435 hydraulic stand installed on u043du043eu0440u043cu0430u043bu0438 to them and u043du0430u043fu043bu0430u0441u0442u043eu0432u0430u043du0438u044e, upper or u0436u043du0438u0439 elements u043eu0433u0440u0430u0436u0434u0435u043du0438u00a0 and hydraulic jacks u043fu0435u0440u0435u0434u0432u0438u0436u043au0438,u043eu0442u043bu0438u0447u0430u044eu0449u0430u00a0u0441u00a0 what elements u043eu0433u0440u0430u0436u0434u0435u043du0438u00a0 u0441u0432u00a0u0437u0430u043du044b with possibility of angular displacements between a transverse u0431u0430u043bu043au043eu0439 and fixed angle to each other, the internal space of which installed hydraulic upright rods which u0448u0430u0440u043du0438u0440u043du043e u0441u0432u00a0u0437u0430u043du044b with upper part of the u043eu0433u0440u0430u0436u0434u0435u043du0438u00a0 and cylinders with bottomu043au0430u0436u0434u0430u00a0 u043eu043fu043eu0440u043du0430u00a0 girder is installed below a hydraulic bar through the u043fu0430u0434u0435u043du0438u00a0 reservoir, u0441u0432u00a0u0437u0430u043du0430 her superficial: on axis beams, with the possibility of st. u043eu0431u043eu0434u043du044bu0445 displacements from the u043fu0430u0434u0435u043du0438u00a0 - hard, and u043du043eu0440u043cu0430u043bu0438 to u043du0430u043fu043bu0430u0441u0442u043eu0432u0430u043du0438u044e - with the possibility of a limited relative displacement, the end of a u0437u0430u0432u0430u043bu044cu043du044bu0439 balk and through the u0442u00a0u0433u0438 u0448u0430u0440u043du0438u0440u043du043e u0441u0432u00a0u0437u0430u043d with transverse u0431u0430u043bu043au043eu0439,one end of the u043fu0435u0440u0435u0434u0432u0438u0436u043au0438 u0448u0430u0440u043du0438u0440u043du043e u0441u0432u00a0u0437u0430u043d with outer side surface lower support beams, and the other with a transverse u0431u0430u043bu043au043eu0439 established upon the next section. u0432u043bu0435u043du043du043eu0439 to fall below the reservoir.