某“华龙一号”核电站核岛基础大体积混凝土施工裂缝控制

THE CRACK CONTROL IN MASS CONCRETE CONSTRUCTION OF NUCLEAR ISLAND FOUNDATION OF A “HUALONG NO.1” NUCLEAR POWER PLANT

"华龙一号"是中国自主创新研发的第三代核电技术。核岛基础底板是核电站反应堆主要的支承结构,对抗裂要求极高。基础底板常采取分层整体浇筑,因水泥水化热的释放,温度场、应力场互相影响,施工难度大,裂缝控制困难。对混凝土温度和应力准确推算、分析、模拟,是有效控制裂缝的前提。结合国内某"华龙一号"核电站基础底板大体积混凝土施工实例,研究了混凝土的应力状态、温度收缩机制,并很好地控制了裂缝的发生。

“Hualong No.1”is the third generation of nuclear power technique developed independently by China.The nuclear island foundation floor is the main supporting structure of nuclear power plant reactor,and the anti-cracking requirements are very high.The foundation floor is usually layered and monolithic.Due to the release of cement hydration heat,the temperature field and stress field interact with each other,so the construction and the crack control are extremely difficult.Accurate prediction,analysis and simulation of concrete temperature and stress are the prerequisites for effective control of cracks.In the paper,the stress state and temperature shrinkage mechanism of concrete were studied in accordance with the concrete construction example of the foundation floor of a“Hualong No.1”nuclear power station,and the cracks were controlled well.