SINGLEARCH SHED GREENHOUSE

单体拱棚俗称冷棚，是一种简易实用的保护地栽培设施，由于其建造容易、使用方便、投资较少，随着塑料工业的发展，被世界名国普遍采用。利用钢材等材料,并覆盖塑料薄膜,搭成拱形棚,供栽培蔬菜,能够提早或延迟供应,提高单位面积产量,有得于防御自然灾害特别是北方地区能在早春和晚秋淡季供应鲜嫩蔬菜。一般为拱形，主要以镀锌钢为主材，以塑料薄膜为透光覆盖材料，内部无环境调控设备的单跨结构设施，称为塑料棚。塑料棚根据跨度和脊高的尺寸大小分为塑料大棚和中小拱棚。大棚跨度一般为 8~ 25m，脊高 2.4~7m，长度 30 ~ 200m。该温室主副拱、拱杆、横梁等均热镀锌圆管，侧面通风采用手动或电动卷膜器卷帘通风，卷膜高度 1.5 米左右。薄膜由镳锌或铝合金卡槽和包塑卡丝固定，美观适用且耐腐蚀。覆盖材料采用塑料薄膜，其造价低。项目前期投入较小。北方地区多为双层充气膜，透光率(双层)75%左右;南方地区多采用单层膜，透光率(单层)80% 左右。

Commonly known as a cold shed, it is a simple and practical protective ground training faciity. Due to its easy construction convenient use, and low investment,it has been widely adopted by countries around the world with the development of the plasticindustry, Using steel and other materials, covered with plastic flm, to build an arched shed for cultivating vegetables, can advanceor delay supply, increase unit area yield, and defend against natural disasters, especially in northern regions where fresh and tendervegetables can be supplied in early spring and late autumn off-season. A single span sructural faciity that is generally archedmainly made of galvanized steel as the main material, covered with transparent plastic film, and without environmental controequipment inside, is called a plastic shed. Plastic sheds are divided into plastic sheds and small arch sheds based on their span andridge height dimensions. The span of the greenhouse is generally 8-25m, the ridge height is 2.4-7m, and the length is 30-200mThe main and auxiliary arches, arch rods, crossbeams, etc. of the greenhouse are all hot-dip galvanized round pipes. The sideventilation adopts manual or electric film roling shuter ventilation, with a flm rolling height of about 1.5 meters. The film is fixed bygalvanized or aluminum aloy card slots and plastic coated card wires, which are beautiful, suitable, and corrosion-resistant. Thecovering material is made of plastic film, which has a low cost. The initial investment in the proiect is relatively small. in northernreaions, double-laver infatable membranes are commonly used, with a light transmitance (double-layer of about 75%; Single layelfilms are commonly used in southern regions, with a light transmittance (single-layer) of about 80%。