FIELD: mining, particularly methods to fill slope secured with roof bolting.
SUBSTANCE: method involves drilling-out massif area around each roof bolt to be removed. For massif area drilling-out runner rod and grilled lagging are taken away in roof bolt removal zone. Then guiding bush is screwed on rod end projected in mine and freed of fastening nut and support member so that the guiding bush is restricted from rotation. Drilling tool, namely drill-rod made of pipes with annular crown, is advanced along guiding bush side up to crown resting against rock. Then annular slot about rod to be removed is created for rock massif breaking along with core forming inside the pipes. After that rod is disintegrated from rock massif and core with rod is removed from annular slot under the action of external force. Rod is released from core rock by core rock breakage.
EFFECT: possibility to remove roof blots having different structures.
3 cl, 7 dwg
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