METHOD FOR DETERMINING OF THERMAL ENERGY CONSUMPTION WHILE HOLDING CONCRETE IN TECHNICAL SHELTERS WHEN ESTABLISHING BY THE METHOD OF CYCLIC LONGITUDINAL PUSHING OF SPAN STRUCTURES
The erection of overpasses of transport facilities is usually carried out in conditions of year-round construction, which requires the construction of technological shelters for holding the concrete of the span structures in the cold period of the year, ensuring a favorable temperature regime for concrete hardening to gain the required strength and preventing the massive appearance of temperature cracks as at the stage of heating concrete from exotherm cement, and when cooling the erected structures. When operating greenhouses, additional costs arise for the generation of heat energy, which must be properly taken into account. In this regard, this article presents a method for calculating greenhouses and presents the results of calculating the consumption of thermal energy for structural elements of span structures, which can be used both when determining the number of heat generators or electric heaters, and when determining additional costs when performing work in winter conditions. Data justifying the duration of concrete heating in greenhouses in the winter period, including before placing the concrete mixture in the structure in accordance with the requirements of regulatory documents, as well as the data required to determine the duration of concrete care must be taken into account when developing technological regulations for production concrete work, where the results of the corresponding thermophysical calculations should be presented.