Study On Influencing Factors And Control Of EPC Project Cost Of Sewage Treatment Based On SEM-SD Model

In the background of rapid economic development,environmental problems have been developed to restrict the economic growth and social progress of the important factor.With the technical progress of sewage treatment level,sewage treatment industry has also been a long-term development.In recent years,China has greatly strengthened the investment in sewage treatment construction projects.With the increase of the number of new and expanded urban sewage treatment projects,EPC general contracting mode with integrated management function is increasingly favored and widely used in the field of sewage treatment.For EPC general contractors,cost is an important condition related to their own interests,and the general contractors should strengthen cost management to ensure the maximization of project profits.Based on the advantages of EPC mode and characteristics of sewage treatment projects,as well as the background of sewage treatment industry,this paper studies the cost control of sewage treatment EPC projects.Firstly,the cost composition of sewage treatment EPC project was identified,and the index system of influencing factors of sewage treatment EPC project cost was constructed.Based on the index system of influencing factors of sewage treatment EPC project cost and practical experience,a hypothesis was proposed for the interaction between various factors,and a corresponding structural equation model was established to explore the influence path of various factors on the cost of sewage treatment EPC project.On the basis of system dynamics,a dynamic evolution model of EPC project cost of sewage treatment is constructed,and the dynamic influence law of key factors on the cost of EPC project of sewage treatment is analyzed by using the principle of system dynamics,and its mechanism of action is revealed.The results show that:(1)The key factors affecting the total cost of sewage treatment EPC projects are the cost factor in the construction phase,followed by other factors,design cost factor,procurement cost factor,and trial operation cost factor.(2)The influence degree of each factor in the construction phase is1.91%,1.95%,2.10%,2.05%,1.82%,1.78%,respectively;The order is:settlement management method >construction technology level >site visa >subcontract>construction period cost > construction quality.(3)Put forward targeted improvement measures for key influencing factors,which are: control of site visa,subcontracting and settlement management,improvement of construction technology level,construction multi-objective management.