Method for conducting preparatory works in a thick bed of coal under the fall of roof

摘要

the application concerns a method of preparatory works in thick board coal cave in, when the upper layer is selected without collateral with the stroke beams.this is,that excavation paving (4 ') is under the bracket (6), with przypinanej shelf carbon and / or lower zone workings zawau0142owego (with) by injection of progressively to progress ancestor (4") mixture of binding short holes iniekcyjnymi.in addition, with the workings chodnikowego (4 ') iniekcyjnymi long holes (10) zatu0142acza in upper zone gruzowiska zawau0142owego () neighborhood keystone mixture binding measures of time binding regulowanym according to capacity gruzowiska zawau0142owego (with).advantageously wyrobisko paving (4 ') is carried out after upadzie,and injection of long holes iniekcyjnymi (10) pursues acting successively wzniosie workings chodnikowego (4 ') in mutual distances (l1) dependent on the capacity gruzowiska zawau0142owas (with).