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 de fixation du bord d'une nappe tendue, applicable notamment à la fixation du bord inférieur d'une toile de tente et abri léger pourvu d'un tel dispositif
Ensemble de joints adaptes pour assurer l'etancheite entre deux cadres de panneau photovoltaique se chevauchant partiellement et cadre equipe de tels joints