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E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
E21D21/008—Anchoring or tensioning means
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Mining & Mineral Resources
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FR783231A1959-01-051959-01-05Boulon d'ancrage à expansion, plus particulièrement destiné au soutènement suspendu des toits de mines
ExpiredFR1221659A
(fr)
Perfectionnements apportés aux dispositifs de soutènement de toits de mine, ou de souterrains ou analogues, comportant au moins un boulon d'ancrage