论文部分内容阅读
一、塑料大棚的结构和性能。塑料大棚的方位以南北延长为适,可使通风透光条件较好,棚内外小气候局部差异减小。大棚的大小以全长40—60米,宽16米左右,中高1.8—2.2米,每棚面积在1—1.5亩较好。面积过大,长度过长,管理不便,例如放风、下瓜、运输等都会增加困难。宽度过宽,棚顶坡度就小,这样,下雪下雨时雪、水不易顺畅流下,易压损棚架。 (一) 大棚结构。目前我市主要是竹木结构和水泥柱结构。它的主要组成部份有立柱、拱杆、拉杆、压杆及压杆拉线等。在建棚时要注意选料适当,施工严格,重视防风防雨和通风换气问题。
First, the structure and performance of plastic shed. The orientation of plastic greenhouses extended to suitable for the north and south, the ventilation and light conditions are better, local differences in microclimate shed shed. The size of the greenhouse to full-length 40-60 meters, 16 meters wide, 1.8-2.2 meters high, each shed area of 1-1.5 acres better. The area is too large, the length is too long, and the management is inconvenient. For example, the wind, the melon and the transport will all increase the difficulty. Width is too wide, the roof gradient is small, so that snow and snow when it rains, the water is not easy to flow down, easy to damage the scaffolding. (A) shed structure. At present, our city is mainly bamboo structure and cement column structure. Its main components are columns, arch bars, rod, the pressure rod and the pressure rod cable. In the construction of sheds should pay attention to the proper choice of materials, construction is strict, pay attention to wind and rain and ventilation problems.