FIELD: mining.
SUBSTANCE: in the course of roof early attachment at pillar extraction between workings filled with concrete first the cuts of the first turn are done through the pillars the width of which is equal to one working span. Then they are filled with concrete. The second turn cuts are done with the following concrete filling. After the cutting of the first turn there mounted is an advance support installed in the pillar from the cuts of the first turn at the level of second turn cut dome at an angle 60-70° against cut axis with pitch 0.5-1.0 m.
EFFECT: increase of works safety.
2 cl, 3 dwg
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