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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
E21D11/36—Linings or supports specially shaped for tunnels or galleries of irregular cross-section
E21D11/365—Linings or supports specially shaped for tunnels or galleries of irregular cross-section for intersecting galleries