Method and a device for the manufacturing of a lightweight structure, and also a lightweight structure

A method for the manufacture of an integrally reinforced lightweight structure with a fiber-reinforced plastic by a molding tool, the structure having stiffening ribs crossing one another at node points and a skin attached to the stiffening ribs. The molding tool has channel-type depressions for creating the stiffening ribs. The steps include laying down into the depressions at least one intermediate layer and at least one reinforcement layer, repeating the laying down until the depressions are at least partially filled with intermediate layers and reinforcement layers to form the stiffening ribs with integral connecting feet, populating the molding tool with intermediate layers and reinforcement layers for manufacturing the skin, and curing and/or solidifying the intermediate layers and reinforcement layers. A resulting lightweight structure and a device for the manufacture of the lightweight structure are also disclosed.