【摘要】 大垸泵站进水流道底板各部分结构尺寸差异大,最薄处厚度0.8 m,不便于布置冷却水管,浇筑时间又安排在1月初,环境温度低,混凝土温升温降快,导致结构尺寸变化大的部位温控防裂很难满足要求。经有限元方法反复计算和方案比较,采用控制混凝土入仓温度17℃,前10 d搭设保温棚提高环境温度,后期采用单层保温被表面保温,有效解决了泵站流道底板混凝土浇筑的温控问题。更多还原

【Abstract】 In Dayuan Pumping Station, the structural dimensions of the concrete bottom plate of the inlet channel vary greatly in different parts. The thickness of the thinnest part is only 0.8 m, where the water cooling pipe is difficult to arrange. In addition, the concrete pouring work is scheduled in early January. Due to the low environment temperature and the rapid change of the concrete temperature, it is difficult to fulfill the requirements of the temperature control and crack prevention work for parts with large structural dimension variations. Finite element simulations are thus carried out to compare the effects of different temperature control schemes. An effective scheme is finally selected. In the scheme, the concrete pouring temperate is controlled at 17 ℃. For the first 10 days, thermal insulation shed is set to increase the environment temperature. In the later stage, single layer thermal insulation quilt is adopted for surface insulation. It effectively solves the temperature control problem in the concrete bottom plate pouring of the inlet channel.更多还原