E04C3/00—Structural elongated elements designed for load-supporting
E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
E04C3/26—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members prestressed
Principe de mise en compression mecanique des produits verriers utilises comme composants de la construction pour constituer des structures porteuses principales et des systemes constructifs applicables dans la construction
Procede de fabrication de structures mises sous contrainte,telles que des poutres,des profiles et des treillis,ainsi que les structures ainsi realisees