| 摘要 |
FIELD: construction. ^ SUBSTANCE: on a corrugated sheet there are transverse stiffening folds arranged at the angle to a short side of a shaped sheet to form embossed maps 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 |
