FIELD: road building machinery; truck cranes, road levelers and other machines. SUBSTANCE: proposed frame has cross beams and longitudinal beam carrying base unit made in form of truncated pyramid whose height is equal to height of longitudinal beam. Longitudinal beam is made in cross section in form of trapezium. Invention is aimed at further increasing rigidity of lower frame, including rigidity over perimeter of slewing gear at minimum weight of frame. EFFECT: increased service life, improved reliability of frame, simplified manufacturing. 2 cl, 3 dwg
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