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为研究塑料波纹管道作为冷却管的降温效应,以望东长江大桥索塔下横梁为研究对象,对传统金属冷却管降温措施进行了改进,提出采用空气压缩机向波纹管道内压“水雾”的降温措施。并通过试验测试了波纹管道内的“水雾”降温效应及热导性。在此基础上,采用桥梁商业程序MIDAS.FE建立下横梁实体有限元模型,并对其进行水化热仿真分析,结果表明:冷管对混凝土水化热降温效应明显,有无冷管混凝土最高温度相差12℃。该降温措施构思新颖、就地取材,为大体积预应力混凝土温控提供了一种全新的解决办法。
In order to study the cooling effect of plastic corrugated pipe as a cooling pipe, taking the lower beam of the pylon of Wangdong Yangtze River Bridge as the research object, the cooling measures of the traditional metal cooling pipe were improved. The air compressor was proposed to compress the internal pressure of corrugated pipe Cooling measures. And tested through the test corrugated pipe “water mist ” cooling effect and thermal conductivity. On this basis, the finite element model of the lower crossbeam was established by bridge commercial program MIDAS.FE, and the hydration heat simulation was carried out. The results showed that cooling pipe has obvious cooling effect on concrete hydration heat, The temperature difference of 12 ℃. The cooling measures innovative ideas, local materials, for large volume prestressed concrete temperature control provides a new solution.