Research On The Planning And Control For Construction Process Of The Industrialized Building

The complexity of industrialized construction(IC)is refleted in the process,production system,and the social system related with IC.These kinds of complexity have significant influences on the planning and control of IC.At present,effective planning and control methods to the industrialized building projects are still undeveloped.Some new issues such as defective products,the increased construction cost,and slow productivity of assembly on site have been occurred in previous industrialized building projects.The meanings of IC to the building and construction industry were hampered by the traditional management method.In order to improve the level of planning and control of IC,this study developed the planning and control system of IC based on building information modelling(BIM),lean construction and concurrent engineering.Firstly,the history and development of lean,concurrent engineering were introduced.BIM was adopted to provide a supporting environmennt of lean and concurrent engineering.The interactions of BIM with lean and concurrent engineering were identified.The feasibility of the developed theoretical system was also analyzed and the framework for implementing this system was then presented.Secondly,the concepts of IC and the planning and control of IC were defined.The three parts of IC namely the process,the organization,and the technology and the supply chain of IC were analyzed to identify the underlying factors.The a comprehensive questionnaire was designed to analyzing the CSFs of IC in China.The mean score method and the explainary factor analysis method were adopted to ranking the importance of 23 CSFs and classified these factors into five groups.Thirdly,the lean theory was adopted in the production planning and control of prefabricated components.The mixed production scheduling problem was developed and the improved genetic algorithm(GA)is adopted to solve this problem.The lean precast concrete production system was developed to eliminate the effect of variabilities in the production.The computer simulation method was used to validate the effect of this method.The key parameters such as works in progress(WIPs)were monitored and the production performances such as the cycling time between traditional production method and the developed lean production system were analyzed.It has been proved that the lean production system of precast concrete components can reduce the cycling time of precast components,reduce the influence of variabilities in production,and save production cost.Finally,BIM based planning and control system of IC,also called Prefab-BIM system in this study was developed.The function model of IC was developed that contains the design,production,logistics,and assembly processes.The dependency structure matrix(DSM)method was used to analyze and optimize the dependency relationship of activities in IC.The concepts of upstream evolution and downstream sensitivity were used to analyze the strategies of implementing the methods of concurrent engineering into IC projects.The main scene and objects in IC were analyzed to learn the information flow in IC.The the Prefab-BIM system was developed based on the resource-oriented-architecture(ROA).The main technologies used in this system consist of the storage and transformation method of BIM model in the Web,the extented BIM database base on IFC(Industry Foundation Classes)and the JSON.The prototype of this system was realized based on a case project in China.This study improves the theoretical system of the planning and control of IC.It’s beneficial to adopt the theories and principles of the manufacturing to the building and construction industry.The developed Prefab-BIM system can facilitate the information sharing and communication based on BIM among participants in the IC,and promote the adotion of lean and concurrent engineering in IC in the future.This study also provides a valuable reference for researchers and practitioners in the field of IC.