Study On Quantization Scheme Of Lean Construction Of Engineering Project Based On Owner’s Demand

With the increasing diversification and differentiation of owners’ demand in the field of engineering construction,lean thinking,as the core theory to deal with this problem,has been gradually introduced into engineering project management,and lean construction comes into being at the right time.However,as the increasingly diversified and personalized demands of the owners have not been fully recognized and accurately met,the engineering practice has fallen into a dilemma that it is impossible to sink lean construction from the concept to the practical scheme.Therefore,it is an urgent problem to fully capture the demand of the owners and provide operational lean construction implementation plans accordingly.Based on the basic theory of lean construction TFV and the application principle of lean thinking,this study makes clear that the owner’s demand is the conceptual connotation of lean construction.Firstly,through the semi-structured interview and the sorting of contract text,the owners’ demands of the engineering project are comprehensively identified and excavated,the related concepts are summarized and integrated,and the validity test of the identification results is carried out.Then,the quantitative dimension of lean construction is determined based on the owner’s demands,and the quantitative analysis is carried out to establish the objective function of lean construction.Particle Swarm Optimization(PSO)with linear decrease of inertia weight was selected,and dynamic threshold optimization algorithm was set to solve the process,in order to realize the design and construction of lean construction quantitative model.Finally,the second phase of Tianjin Metro Line 6project is taken as an actual case to identify and supplement the owners’ demands for this project,and accordingly adjust and optimize the quantitative model to build the lean construction quantitative model for this project.Collect the shield construction data of the fourth working area and solve the model,and obtain several groups of lean construction quantitative schemes that meet the demands of the owners.Based on the above research,the main research results are as follows: First,owners’ demands in engineering projects mainly include investment control,progress control,quality assurance,safety assurance,environmental protection,risk control and team stability.Secondly,a lean construction scheme model with strong applicability is designed and constructed,which can be flexibly adjusted and optimized based on the different demands of the owners in the actual project.Thirdly,the model was solved based on actual cases,and 5 groups of optimal solutions exceeding the threshold value of 5.35 were finally obtained,that is,5 lean construction quantitative schemes with the best effect to meet the demands of the owners.The results show that the construction unit can choose the lean construction quantitative scheme with the highest score and the best effect to meet the needs of the owners when the owners’ demands are relatively balanced and there is no particular emphasis on a single demand.For the project where the owner pays more attention to the progress,the shortest construction period can be selected.For the project where the owner pays more attention to investment control,the lowest cost construction scheme can be selected.For the project where the owner pays more attention to quality assurance,the construction scheme with the lowest quality cost can be selected.For the project where the owner pays more attention to safety,the construction scheme with the greatest safety benefit can be selected.For the project where the owner pays more attention to environmental protection,the construction scheme with the lowest environmental impact level can be selected.For the project where the owner pays more attention to the risk,the construction scheme with the least risk can be selected.Pay attention to the project project with stable construction team more in the light of owner,can choose the construction plan with highest stability index.