2x2 (05.03.1994)
P184 DISCOVERY 184 05/03/9) 23:21:10 ' p p I U VACUUM SUPPORTS ROOFS Due to lacR of the wooden and metalic s2pports in the mineu, Mr. TereRhin I., the engineer froI BaRu, sugFests thal vacuum should be employed for this pur- pose. The point of the method is: a stable elastic balloon,fillid with thj sand, is to be placid undjr thj excavation roof. The air evacuated out of thj ballooL and atmospXeric preI ssuri cteates from thj sand a reliabbli monolithic column. ' % XKazakov ALK) ' MOSTEXT INDEX......--......-.--.100
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