The Study On Large Nuclear Power Plant Dome Lifting Construction

In pressurized water reactor nuclear power plant, nuclear reactor plantcontainment with large tonnage prestressed concrete cylinder structure, the wallhas sealed steel lining. Steel lining is the last barrier of nuclear power plant safetysystem which plays a decisive role. And the vault is the head part of the steellining; Its whole structure is one and a half elliptical shell. Angle iron and thespray system device along the radial and ring to decorate with the radiation shape.Reactor dome is not only the largest and heaviest component in nuclear powerplant construction of lifting, but also affect nuclear power plant constructionquality and schedule.Nuclear island dome works as the most cores and one of the key componentsin nuclear power facilities, the construction security requirement is extremelyhigh and the requirements to the lifting system are demanding. The thickness of6mm steel plate was welded into diameter37m steel lining to achieve docking, thehi-lo deviation not allowed more than1.5mm. In the industry they weredescribed as "blade to blade" splicing. There are many difficulties in the liftingwork such as the weight is so big, leveling difficult (center of gravity and thecensorial deviation), the area is large, lifting height in place, butt precision high.This passage is based on the nuclear plant fangchenggang dome lifting toactual engineering. In the lifting process each link was on research and discussion.All kinds of factors and control and solution methods that will influence thesafety and quality of the dome lifting is discussed in detail. From fangchenggang nuclear power plant reactor building dome before integral hoisting constructionpreparation, dome precast and assembly, sling selection, lifting size control, try tohang, officially lifting, to dome upper splicing of dome overall construction, weelaborates the lifting comprehensively and introduces the key points from precastto whole lifting process.