FIELD: construction.
SUBSTANCE: method of making three-layer ribbed construction element is made flat sheet workpieces of different width. Workpieces are connected to each other by attaching discretely pieces smaller width on surface of wide workpiece. Workpiece is connected with help of glue to form ribbed plate. Arranged on both sides of plate carbon layers with bend behind the edge. After adhesion of layers is deformed workpiece feeding compressed air between them. During deformation simultaneously form longitudinal hollow ribs and cylindrical shape element. Reduced material consumption.
EFFECT: higher bearing capacity and corrosion resistance.
1 cl, 9 dwg
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