Analysis And Control Of Construction Accuracy Of Steel Concrete Containment Vessel On Nuclear Island

Under the background of increasing energy demand,decreasing conventional energy reserves and increasing environmental pollution,nuclear energy,as a new and efficient clean energy,has obvious advantages,so it is imperative to develop nuclear energy.CAP1400 nuclear power is a new type of three-generation nuclear power technology with independent intellectual property rights in our country.The construction precision of containment structure is high.This paper mainly studies the construction accuracy and control of the outer containment structure(SC structure)of the CAP1400 pile core island by finite element simulation analysis,and provides the theoretical basis for the construction plan.Based on the design features of the SC structure,this paper compares and analyzes the block hoisting scheme with the whole hoisting scheme,and selects the whole hoisting scheme with the whole ring module,According to the different hoisting methods of slings and trusses,several possible lifting schemes of different lifting points are proposed.The ABAQUS finite element software is used as the analysis tool to establish the finite element model and define the relevant model parameters.Firstly,the deformation characteristics of the SC structure are quantified and analyzed when the sling is directly hoisted and the hanger is hoisted,and the structural stress and cable force are checked.In the same way,the non-standard layer(18 and 19layers)module structure is simulated and analyzed under the condition of sling hoisting.Through the optimization and comparison of the number and position of the lifting points,an economical and reasonable number of lifting points and the layout of the lifting points are put forward on the premise of ensuring the construction accuracy.The final standard layer structure selects the scheme of hanger hoisting,and the non-standard layer structure selects the scheme of sling hoisting.By using the finite element software,the deformation and internal force of the standard and non-standard layers of the SC structure under the action of the concrete side pressure are simulated and analyzed.The results show that the maximum deformation position of the module is approximately the same as the joint action position of the concrete side pressure.According to the results of finite element numerical analysis,the corresponding SC structure hoisting implementation scheme and self-compacting concrete pouring scheme are worked out respectively.After on-site testing,the construction accuracy can meet the standard requirements and the construction deviation meets the expected value,which shows the correctness and validity of the theoretical analysis in this paper.