关键词: 严寒地区, 碾压混凝土坝, 温控, 水管冷却, 保温

Abstract: A water conservancy project in Xinjiang is located in a cold and arid area. The water retaining structure is a RCC gravity dam with a maximum height of 75.5 m, and the total storage capacity is 294 million m3. The unfavorable climate, namely cold, hot, windy and dry in typical severe cold region and the intermittent construction method have increased the difficulty of temperature control and crack prevention of dam concrete. By taking a series of temperature control measures from design to construction, including pouring temperature control, pipe cooling optimization, permanent thermal insulation of dam surface, temporary thermal insulation in spring and autumn and overwintering thermal insulation of the lift surface and other exposed surfaces, and pouring plan optimization, the cracking risk of dam concrete has been substantially reduced, and the temperature cracks of dam concrete have been effectively controlled.

Key words: severe cold region, RCC dam, temperature control, pipe cooling, thermal insulation