Research On Hoisting Sequence Planning And Controlling Of Prefabricated Concrete Structure Buildings

With the development of prefabricated concrete structure buildings,they are having higher prefabrication rate,larger size,and more complex structure.These make their hoisting sequence planning more difficult.Besides,as some influencing factors are not easy to control during the construction of prefabricated concrete structure buildings,the hoisting sequence scheme that has been made is changed constantly so as to reduce the utility of hoisting sequence planning.It is also not conducive to the standardization,normalization and lean of assembly construction.At present,these problems are gradually being taken seriously,and the related research has a certain degree of newness.Under this background,this dissertation studies the hoisting sequence planning and controlling of prefabricated concrete structure buildings,and it has certain theoretical and practical significance.Taking prefabricated concrete structure buildings as the research object,and the problem of their hoisting sequence planning and controlling is discussed.The scattered related knowledge is systematically collected,combed,tested,revised and summarized for rising to the level of theoretical method model by the literature research,project survey,and expert consultation.Then,this dissertation introduces and explains some theoretical methods supporting the research on hoisting sequence planning and controlling for prefabricated concrete structure buildings,namely hierarchical tree model(HTM)technology,building information modeling(BIM)technology,improved genetic algorithm(IGA),influencing factor analysis method s,and radio frequency identification(RFID)technology,especially elaborates on the improved genetic algorithm.On this basis,this dissertation further estalishes the BIM-IGA-based hoisting sequence planning and optimization model,the identification and analysis model of influencing factors for hoisting sequence scheme change based on influence factor analysis methods,as well as the BIM-RFID-based hoisting sequence dynamic controlling model.In the BIM-IGA-based hoisting sequence planning and optimization model,a tree diagram of hoisting sequence information is designed,and a hoisting sequence scheme evaluation index system for similar precast components is established.These indexes are quantified,and a unified evaluation objective function is setted.The improved genetic algorithm is used to solve the optimal hoisting sequence scheme,and the scheme is further visually tesed by BIM technology.Case-based reasoning method is introduced to further improve IGA.In the identification and analysis model of influencing factors for hoisting sequence scheme change based on influencing factor analysis methods,the identification method of influencing factors based on literature-survey-consultation is proposed,and an influencing factor system of hoisting sequence scheme change for prefabricated concrete structure buildings is established according to the method.The influencing factor analysis method based on ISM-MICMAC-DEMATEL is used to carry out the hierarchical structure analysis,classification analysis and importance analysis of the influencing factors,and the corresponding suggestions are given.The method integrating the solution results of ISM-MICMAC-DEMATEL and the probabilities of occurrence and condition of various influencing factors into the interpretive structural model is proposed.In the BIM-RFID-based hoisting sequence dynamic controlling model,the dynamic controlling mechanism of influencing factors for hoisting sequence scheme change based on BIM-RFID is proposed and elaborated.The mechanism uses building information modeling technology to correlate prefabricated concrete structure building projects,and uses radio frequency identification technology to collect real-time data on influencing factors for hoisting sequence scheme change.The visual dynamic adjustment model for hoisting sequence scheme is established.The integration of BIM system and RFID system is analyzed,and the prototype of BIM-RFID-based hoisting sequence control system is proposed and elaborated.Finally,the core theoretical method models established in this paper are simulated through a prefabricated concrete structural building project.The project can also be used to test and improve these core theoretical method models to make them more effective during follow-up related practices.In the research process,this paper draws on a variety of theoretical methods and improves some of them.On this basis,some core theoretical method models are established.This is conducive to enrich and expand the theoretical system of hoisting sequence planning and controlling for prefabricated concrete structure buildings,and promotes its further research.The BIM-IGA-based hoisting sequence planning and optimization model helps the construction industry to make an optimal and reasonable hoisting sequence scheme.The identification and analysis model of influencing factors for hoisting sequence scheme change,and the BIM-RFID-based hoisting sequence dynamic controlling model help to ensure that the hosting sequence scheme is implemented smoothly.