| 摘要 |
<p>An extensible structure designed to be covered by a flexible roof and applicable to the construction of roofs, tunnels and the like comprises a plurality of U-shaped profiles (1,11) hinged together (5,14) and provided at their lower ends with wheels (6,14) and covered at their upper ends by a canvas (7,16) with the interposition of stress absorbing bands (8, 9, 10). <IMAGE></p> |
