Open AccessRATIONAL PARAMETERS OF A MULTI-SPAN GREENHOUSE OF BUILDING PRODUCTION FOR SMALL FORMS OF MANAGEMENT
Author(s) -
А. Блажнов
Publication year - 2020
Publication title -
vestnik bgtu im. v.g. šuhova
Language(s) - English
Resource type - Journals
ISSN - 2071-7318
DOI - 10.34031/2071-7318-2020-5-11-41-47
Subject(s) - greenhouse , span (engineering) , agricultural engineering , frame (networking) , fencing , production (economics) , environmental science , engineering , structural engineering , computer science , agronomy , mechanical engineering , macroeconomics , parallel computing , economics , biology
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.