近年来，塑料大棚不仅在种植业而且在养殖业等领域都得到了广泛的应用。但是，目前大棚骨架材料有不少缺陷：一直广泛应用的竹木结构，寿命短，棚顶低，空间小，尤其是那无数支柱，象一片树林，给作业管理带来诸多不便，难于使用机械作业，限制了空间的充分利用；使用钢铁骨架? In recent years, plastic greenhouses have been widely used not only in crop farming but also in aquaculture and other fields. However, at present, there are many defects in the framework materials of greenhouses: the bamboo and wood structure that has been widely used has a short life span, a low roof, and a small space. In particular, the numerous pillars, like a piece of woodland, bring a lot of inconvenience to the operation management, making it difficult to use machinery. Homework limits the full use of space; use steel skeletons?