TECHNOLOGY OF ERECTION OF PRECAST FRAME BUILDINGS AT NEGATIVE TEMPERATURES

In the article, the author describes the technological peculiarities of erection of frame buildings at negative temperatures. The author also demonstrates structural and technological peculiarities of prefabricated frame elements. The author also speaks about the technology of prefabricated production of stacked columns, pre-stressed girders, beams and hollow core slabs. It is proven that the frame system is applicable for the construction of industrial, residential and office buildings that may have different numbers of storeys and that are flexible in terms of design concepts. Besides, the author describes the technological peculiarities of the assembly of structural elements, their temporary and permanent fixing. The author also provides basic requirements applicable to the technology of grouting of column-to-girder joints and hollow slabs designated for a cased frame. The article also contains an analytical solution of the heat conductivity equation that describes the period of heating of connected elements. The solution makes it possible to use numerical methods to identify the depth of heating of girders and columns, depending on the ambient temperature and the duration of exposure to the heat. The author has also analyzed the technology of grouting of precast structure joints at negative temperatures in the event of pre-heating of structural elements to be connected and the heating of the concrete mix with heating wires. The author has identified the range of rational heating modes for structural joints on the basis of the parameters of negative temperatures