FIELD: mining industry. SUBSTANCE: lower working end face bottom hole part of penetrator is made in form of lengthened rock breaking cone heat-insulated from main part of penetrator. EFFECT: high penetration rate due to exclusion of formation of strong interlayer of melt in hole bottom zone, with simultaneous formation of hole walls having strong layer of thermally transformed rock which fulfil role of casing that cuts down material expenses and reduces time for hole making. 2 dwg
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