| 摘要 |
Drop scaffolding is formed by assemblies of drop tubes 12 and scaffold tubes 15 extending transversely between the drop tubes. Each drop tube has a top coupling secured to an upper part thereof and a bottom coupling secured to a lower part thereof, the two couplings being similar and having cradles with openings directed respectively generally downwardly and generally upwardly. Each coupling comprises an elongate body having a hollow section with a longitudinal axis extending the length of the body, in which section a drop tube is secured. A hook-like cradle 14b, 14c, 14d projects from the body away from the hollow section with an opening x between retaining walls 14c, 14d, each making an acute angle with the longitudinal axis of the section in the quadrant that includes the first end of the body. The cradle can receive a second scaffolding tube and releasable locking means 16 is movable between an open position allowing insertion of the second scaffolding tube into the cradle and a locking position wherein the second scaffolding tube is locked in the cradle. The drop scaffolding is erected by forming a trapeze-like structure of two parallel drop tubes and a lower scaffold tube releasably secured in cradles of two bottom couplings. The structure is suspended from a top transverse tube by hooking top couplings secured to the drop tubes over the top transverse tube and thereafter releasably securing the couplings to the top transverse tube. |
