For electric heating, the steps of the operating voltage were taken: during the period of laying the concrete mixture and isothermal withstanding of concrete 51 and 52 V; during the period of concrete heating (until the temperature of isothermal heating) is 88 and.91.5 b, c. Shields are included in the line in sequentially groups of 3 pieces. The temperature of the concrete mixture before laying into the formwork should be at least +10 °, and the outer air is not lower than -20 °. The heating temperature of concrete is accepted no higher than +60 °.
When erecting a gradirny in winter conditions using the unit, transformer installations are located at the base of the gradirny.
Monolithic reinforced concrete tower hyperbolic gradins are built on a number of thermal power plants. Experience in the design and operation of hyperbolic gradiles in domestic practice does not exceed 10 years.
The shell of the tower of hyperbolic gradirny with walls with a thickness of 350-100 mm is in severe operating conditions.
Water cooling in the gradirn occurs due to evaporation and direct heat transfer to air. During the operation of the gradirny on the inner surface of the shell wall, the condensate of vapors formed during the evaporation of part of the cooled circulation water. The condensate flowing on the surface of the shell dissolves the lime released during hardness of concrete. The outer and inner surface of the walls of the shell (especially in the upper part) is in variable moisture conditions periodically moisturized and dries, and under winter conditions the shell is subjected to alternating freezing and thawing when the outer temperature changes.
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