Tubular hoop for supporting plastics greenhouse tunnels - has oval cross-section with curved upper and lower parts joined by large area flats

摘要

The tubular hoops are arranged to have two straight sides (3, 4) parallel with each other and two curved sides (1) and (2) at the opposite ends. The hoops are inserted at regular intervals under a plastics sheet to form a tunnel which can be supported at the ends by anchorages and along the sides by vertical supports.