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Publication of FR1248149ApublicationCriticalpatent/FR1248149A/fr
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
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FR812068A1958-12-051959-12-04Cadre articulé pour soutènement d'excavations souterraines, notamment pour soutènement de galeries
ExpiredFR1248149A
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