华龙一号核电站内层安全壳穹顶施工技术

Construction Technology of Inner Containment Vessel Dome for HPR1000 Nuclear Power Plant

华龙一号核电站安全壳采用双层钟罩形结构,由反应堆底板、内外筒体、内外穹顶组成。针对内层安全壳穹顶施工难点,对施工段进行优化,对钢筋绑扎、模板支设、混凝土浇筑与养护等关键技术进行研究。通过施工段优化,避免穹顶施工对核电站冷试和热试造成影响。穹顶区域钢筋种类多、形状复杂,利用BIM技术进行钢筋三维放样排版,检查是否存在冲突点。为适应穹顶坡度变化,采用多种形式模板,并改变操作平台节点连接方式。对混凝土水化热、养护温度与时间等进行控制,保证混凝土浇筑质量,避免开裂,使结构具有防辐射性。

The containment vessel of HPR1000 Nuclear Power Plant adopts a double-layer bell-shaped structure,consisting of the reactor bottom plate,inner and outer cylinders,inner and outer domes.In view of the construction difficulties of the inner containment vessel dome,the construction section is optimized,and key technologies such as steel bar binding,formwork support,concrete pouring and curing are studied.Through the optimization of the construction section,the impact of the dome construction on the cold and hot tests of the nuclear power plant can be avoided.There are many types and complex shapes of steel bars in the dome area.BIM technology is used to carry out three-dimensional layout of steel bars to check whether there are conflict points.In order to adapt to the change of the dome slope,various forms of formworks are used,and the connection mode of the operation platform nodes is changed.The control of concrete hydration heat,curing temperature and time can ensure the quality of concrete pouring,avoid cracking,and make the structure radiation resistant.