FIELD: construction.
SUBSTANCE: on a profiled sheet with cyclically arranged trays and straight sections there are transverse stiffening folds arranged at the angle to the short side of the profiled sheet to form relief charts in the form of parallelograms.
EFFECT: improved sealing of sheets along an inclined coupling line, with preservation of catchwater properties of covers at minimum angles of catchwater surface inclination.
2 cl, 8 dwg
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