特大桥承台大体积混凝土初期温度场研究

STUDY OF THE INITIAL TEMPERATURE FIELD OF MASS CONCRETE FOR A SPECIAL BRIDGE BEARING

以重庆龙溪嘉陵江特大桥为研究对象,对9号承台大体积混凝土温度场开展了仿真分析和现场实测研究。结果表明,9号承台冷却水管按5层设计的要求布置,浇筑后温度采集数据正常,混凝土浇筑后通水降温与表面养护都基本满足大体积混凝土的要求。混凝土在浇筑完成后温度升值为47.0℃,混凝土温降过程相对平缓。混凝土表层与芯部的温差满足相关规定要求,现场温控效果良好,无可见裂缝产生,结构处于可控状态。

Taking Jialing river bridge in Longxi,Chongqing as the research object,the temperature field of mass concrete of No.9 bearing platform is simulated and measured.The results show that the cooling water pipe of bearing platform No.9 was arranged according to the requirements of the 5-layer design,the temperature collection data after pouring was normal,and the water cooling and surface maintenance after concrete pouring basically met the requirements of large volume concrete.The temperature rise of the concrete was 47.0℃at the end of the pour and the temperature drop of the concrete was relatively gentle.The temperature difference between the surface layer and the core of the concrete meets the requirements of the relevant regulations,the temperature control effect on site is good,no visible cracks are produced and the structure is in a controlled state.