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
Profile, notamment metallique, destine a permettre une fixation d'un film sur une structure de serre et systeme de fixation d'un film sur une structure de serre comprenant un tel profile
Ferrure angulaire a boulon de serrage de deux elements en forme de barre qui se croisent l'un l'autre, en particulier serrage d'une dent de herse sur une barre de support