FIELD: road building and construction facilities; truck cranes and levellers. SUBSTANCE: frame has cross beams and longitudinal beam carrying base unit. Longitudinal beam is made in form of trapezium in cross-section, and base unit is made in form of truncated pyramid with height equal to height of longitudinal beam. Invention provides increased rigidity of lower frame, including rigidity over perimeter of slewing gear, at minimum weight of frame. EFFECT: increased service life and reliability of frame, simplified manufacturing. 2 cl, 3 dwg
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