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E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
E21D11/14—Lining predominantly with metal
E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
E21D11/20—Special cross- sections, e.g. corrugated
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FR1066245D1951-08-161952-08-12Cadre de soutènement pour galeries de mines, conduites d'eau souterraines, tunnels et ouvrages analogues
ExpiredFR1066245A
(fr)
élément de soutènement flexible et freineur, tel qu'étançon flexible pour l'exploitation minière souterraine, le soutènement de tunnels ou de galeries