三洋港水闸底板水管冷却温控措施优化研究

混凝土初期通水冷却可以起到削峰控温作用,但可能造成水管附近混凝土开裂。本文结合三洋港闸底板通水冷却措施,应用冷却水管有限元直接算法,通过调节通水流量、温度及时间,分析闸底板混凝土温度场和应力场的变化趋势。结果表明:通水流量越大、通水水温越低及通水时间越长均使冷却效果越好。建议可以通过减小冷却水温与混凝土温差,延长通水时间来降低混凝土温度峰值,同时这也可以避免水管附近混凝土产生裂缝。

Study on optimization of temperature control measure with pipe cooling for floor slab of Sanyanggang Sluice

The water cooling can play a role of temperature peak clipping for the temperature control during the early-stage of concrete，but it can possibly cause concrete cracking near the cooling water pipe. In accordance with the water cooling measure for the floor slab of Sanyanggang Sluice，the changing tendencies of both the temperature field and the stress field of the floor slab concrete are analyzed through adjusting the cooling water flow rate，temperature and time. The result shows that lager cooling water flow rate，lower cooling water temperature and longer water cooling time can make a better cooling effect. Therefore，it is suggested that the peak value of the concrete temperature can be lowered through reducing the temperature difference between cooling water and concrete，which can simultaneously avoid the creation of concrete cracks near the cooling pipe as well.