| 摘要 |
The mansard or curb roof is composed of corrugated sheets, and its ridge structure involves a raised part (1) running in its longitudinal direction, passing through the sheet flanges (2). These flanges run in an even arc over the structure where the ridge connects to a flange. This is due to a crescent-shaped fold (3) in the longitudinal direction of the side of the flange, and along the line of intersection (C) of the ridge on the flange sides. |
