FIELD: construction.
SUBSTANCE: rib comprises a substantially flat circular main part. The main part comprises the first sets of unidirectional fibres, forming an angle that is substantially within 25° - 35° relative to the circumferential axis of the rib, and the second sets (35) of unidirectional fibres, forming an angle that is substantially from -35° to -25° relative to the circumferential axis of the rib. Besides, the first and second sets are evenly distributed along thickness of the main part.
EFFECT: invention provides for high mechanical characteristics of a rib with simplification of its manufacturing process.
20 cl, 5 dwg
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