Abstract
Growing vegetables in cultivation facilities can significantly increase the yield of products compared to open ground. Information data on greenhouses offered by producers for farms is summarized. The main types of farm greenhouses are identified, and they are compared for possible heat losses during the cold period of the year. It is established that with an equal building area, the area of enclosing structures of multi-span greenhouses is less than that of single-span frame and arch type. The formula for the minimum coefficient of fencing for a multi-span greenhouse, which provides a minimum of energy costs during the heating period, is derived. The structural scheme of the steel frame of a multi-span greenhouse of construction production from rolled profiles is proposed. It allows to significantly reduce the cost of construction of the structure in comparison with the cost indicators of greenhouses of factory delivery. The dependences of steel consumption for structural elements of the frame as a function of load and its construction parameters are obtained. Based on the obtained dependencies, the rational values of the span and step of the block greenhouse racks for snow loads specified in the building design standards of greenhouses are established. For rational values of planning parameters of the cultivation structure, specific indicators of steel consumption and cost per greenhouse frame are given.
Highlights
Прогиб стержня при продольно-поперечном изгибе определяется по формуле [19]: f fП, (8)
Теплицы для фермерских хозяйств ООО «Агрисовгаз» [Электронный ресурс]
Growing vegetables in cultivation facilities can significantly increase the yield of products compared to open ground
Summary
Где q1 – расчётная равномерно распределённая нагрузка на 1 м2 наклонной поверхности остекления; С – пролёт стекла (расстояние между шпросами); b, h – соответственно ширина и толщина стекла; RИ – расчётное сопротивление стекла на изгиб по СП107.13330.2012. Связь между нагрузками на 1 м2 наклонной (q1) и горизонтальной (q) поверхности может быть выражена формулой: q1 q cos 2 , где α – угол наклона кровли теплицы. Определяющим для подбора сечения шпросов является второе предельное состояние, их прогиб не должен превышать 1/150 пролёта Установим закономерность изменения расхода стали на шпросы из прокатных уголков. Прогиб стержня при продольно-поперечном изгибе определяется по формуле [19]:. 4. Принятая расчётная схема шпросов: qш – снеговая нагрузка на горизонтальную проекцию кровли; l – расстояние между точками опирания шпросов, принятое равным пролёту теплицы; с – расстояние между шпросами
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