张泾河泵闸大体积混凝土精细化温控研究

Study on Fine Temperature Control of Mass Concrete for Zhangjing River Pump and Sluice Project

以上海市张泾河泵闸工程为例,从材料性能、通水冷却及保温、温控监测等方面探讨了泵闸工程大体积混凝土施工期精细化温控防裂技术。通过室内试验及现场大体积混凝土试验获得仿真分析所需的材料热力学参数及表面散热系数,并用于现场混凝土温度场的反馈分析。最后对比分析了通水流量及冷却水管规格对混凝土温度场的影响,结果显示管材及管径对混凝土最高温度及温降速率有较大影响,建议早期采用管径40 mm以上钢管及4 m^(3)/h以上冷却水流量。

Taking the Shanghai Zhangjing River Pump and Sluice Project as an example,the fine temperature control and crack prevention technology of mass concrete of pump and sluice project in the construction stage is discussed from the aspects of material properties,water cooling and thermal insulation measures,and temperature monitoring.The material thermodynamic parameters and surface convection coefficient required for simulation analysis are obtained from the laboratory test and on-site mass concrete test,and then are used for feedback analysis of on-site concrete temperature field.Finally,the effects of water flow and cooling water pipe specification on the concrete temperature field are compared and analyzed.The results show that the material and diameter of pipe have a great impact on the maximum temperature and temperature drop rate of concrete.It is suggested that more than 40mm diameter steel pipe and more than 4m^(3)/h cooling water flow are used in the early stage.