FIELD: construction.
SUBSTANCE: invention relates to structures of perforated beams. Perforated beam includes upper and lower belts of constant cross section from shaped rolled metal interconnected by means of welding with plates from sheet metal, installed with some periodic pitch. At the same time upper belt is made of double tee, and lower one is made from brand. Planks from sheet metal have shape of plates expanding at points of welding to belts, and having smaller width in the middle of height of section of wall.
EFFECT: technical result consists in reduction of beam weight and increase of its bearing capacity.
1 cl, 4 dwg
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