FIELD: construction; shipbuilding; flying vehicles. SUBSTANCE: arch has strakes 1 and 2 and wall 3 with transverse corrugations. Angle α at vertex of each corrugation is no less than 120 deg. These members form l-section. Arch is bent longitudinally at curvature radius of 6 to 8 m. Wall is provided with transverse corrugations whose faces are fitted with lugs rigidity connected with strakes in overlap and bent perpendicularly to plane to one side and to opposite sides for adjacent corrugations in turn. Thickness of strakes is equal to 4-4.5 of thickness of wall and width is equal to 30-40 thicknesses; height of wall is equal to 50-60 of its thicknesses. Slots are provided between bends; their lateral walls are engageable over circle at radius corresponding to hold the width of slot. EFFECT: enhanced reliability. 5 dwg
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