| 摘要 |
The invention relates to a structural element (10), which has sectors (12 to 15) of a material layer (11) that are foldably connected to each other along joint axes (16 to 18) and that can be folded open and closed in a fan-like manner around a pivot center (19). On at least a sub-area of a broad side (20) of said material layer (11), at least one second material layer (21) is arranged, which has sectors (25 to 28) that are foldably connected to each other along joint axes (22 to 24) and that can be folded open and closed, of which sectors at least some are connected to the first material layer (11) in the area of joint axes (16, 18, 22, 24) facing each other and which can be folded closed and can be folded open in the opposite direction in the area of the joint axes (22 to 24) of the sectors when the first and/or second material layer (11, 21) is folded. |
