| 摘要 |
<p>A set of tunnel-type greenhouses can be assembled so that they intercommunicate. The top assemblies are joined by means of links and braces to channels securing the covering film material and for drainage, and then secured to the lower anchoring arches by clamping collars. Each top assembly can comprise two top links hinging at one end on a strut supporting a drain channel and channels securing the film material edges, and at the other on collars enclosing the top part of an arch.</p> |
