某斜拉桥承台大体积混凝土水化热温度场研究与关键施工技术应用

Study on the Hydration Heat Temperature Field of Mass Concrete and the Application of Key Construction Technologies for a Certain Cable Stayed Bridge Cap

依托某双塔双索面梁斜拉桥,基于有限元软件MIDAS/Civil对大体积混凝土承台的水化热温度场进行了仿真模拟,详细研究了水化热温度场及混凝土内外温差等变化规律。并基于有限元研究成果,采取了大体积混凝土配合比优化设计、原材料预冷、预埋水管冷却、优化浇筑顺序及养护等多个温度控制措施。实践证明,上述措施可以有效控制混凝土水化热,提高混凝土施工质量,降低施工成本,从而获得良好的经济及技术效益。

In this paper,based on a double-tower double cable plane cable-stayed bridge,based on the finite element software MIDAS/Civil Engineering,the hydration heat temperature field of the mass concrete pile cap was simulated.The temperature field of the hydration heat and the temperature difference between the inside and outside of the concrete were studied in detail.And so on the law of change.Based on the results of finite element research,a number of temperature control measures,such as optimum design of mass concrete mix,precooling of raw materials,cooling of pre-buried water pipes,optimization of pouring sequence,and maintenance,were adopted.Practice has proved that the above measures can effectively control the heat of concrete hydration,improve the quality of concrete construction,reduce construction costs,and thus obtain good economic and technological benefits.