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
E21D11/22—Clamps or other yieldable means for interconnecting adjacent arch members either rigidly, or allowing arch member parts to slide when subjected to excessive pressure
DISPOSITIF D'ACCOUPLEMENT A 90 degres AU MOYEN D'UN CROISILLON, D'UNE PATTE D'ARTICULATION ET D'UNE PATTE DE FIXATION DESTINEE A ETRE FIXEE SUR UN VANTAIL