The construction of large surface a double wall, with at least one wall bombee

摘要

P element of construction of large area with a double wall, in which at least one of the walls is curved in order to increase the rigidity of the warping. / p & & p & the space between the two walls is filled by the formation of a rigid foam of expanded polyurethane. The crown is preferably produced by the pressure of the foam during the expansion. / p & & p & application to the manufacture of elements of the body of the trucks, receptacles or the like. / p