MULTIPLE-CORE PANEL Russian patent published in 1997 - IPC

FIELD: construction of industrial, civil and agricultural buildings. SUBSTANCE: panel has upper flange 1 and lower flange 2, side walls 3 and intermediate ribs 4. Longitudinal hollows between them are made with various configuration as to cross section of hollows and ribs in panel length. Intermediate ribs, upper and lower flanges and side walls are increasing in thickness in direction from end faces towards center of panel, and intermediate ribs additionally are increasing in thickness and height in direction from middle of panel towards side walls relative to each other. Number of intermediate ribs is dictated by requirements that distance between them is not larger than 4-6 minimal thicknesses of upper flange. Intermediate ribs are located at distance reducing from center of panel towards its side walls. EFFECT: increased rigidity and resistance to cracking. 2 cl, 3 dwg