Abstract: Combined with the Caijiazhuang super major bridge engineering project, according to the preliminary calculation of cap hydration heat and cap shape, the cooling water pipe is scientifically arranged. According to the regulations of mass concrete specifications, MIDAS software is used for hydration heat simulation analysis, and the temperature field inside the cap and the concrete stress distribution cloud map are obtained. According to the calculated temperature field distribution, a miniature wireless temperature sensor is arranged inside the cap, and the number of sensors is appropriately increased in the high temperature area and low temperature area. Through continuous data observation for 5 days after the cap pouring, the maximum temperature difference of measuring points is 23.6 degrees, which is highly consistent with the simulation results and meets the requirements of the specification. After testing, no cracks appeared in the cap, which indicates that the hydration heat simulation analysis can reflect the actual situation and ensure the construction safety, which provides references for similar cap reinforcement construction hydration heat control.

Key words: mass concrete, heat of hydration, simulation analysis, monitoring

摘要： 结合蔡家庄特大桥工程项目,根据承台水化热初步计算和承台形状,科学布置了冷却水管。依据大体积混凝土规范的规定,采用MIDAS软件进行水化热仿真分析,得到了承台内部的温度场和混凝土应力分布云图。根据计算得到的温度场分布情况,在承台内部布置了微型无线温度传感器,并在温度高区、温度低区适当增加传感器的数量。通过对承台浇筑后5天的连续数据观测,测点的最大温差为23.6℃,与仿真计算结果高度吻合,且满足规范要求。经过检测,承台未出现任何裂缝,这表明水化热仿真分析能够反应实际情况,保证了施工安全,可为相似的承台施工时水化热控制提供参考。

关键词: 大体积混凝土, 水化热, 仿真分析