| 摘要 |
<p>The greenhouse has a covering of sheeting (3) which can be rolled on and off, is permeable to light and u.v. rays, and can be evenly stretched over a supporting structure (1), by means of weights (6). The support structure (1) consists of a curved hot-galvanized steel grille (1) over a base (2), giving a tunnel shape. A gable (4) made of the same material as the support structure, stands at each end of the tunnel, at least one of the gables (4) having a door (7). Lengthwise girders (2') are joined to crosswise ones by means of hot-galvanized screws, and are inserted in U-shaped clamps (9). The roof sheeting (3) is also held in place by brackets (8) suspended from the mesh of the support structure.</p> |
