Economic Research On Prefabricated Reinforcement Concrete Civil Building

The construction industry is a traditional industry with a long history,for a long time,it has played a decisive role in promoting the rapid development of national economy.However,with the rapid development of the construction industry,the problems of low efficiency,unstable quality and resources waste brought about by old-fashioned technology and spartan management have become increasingly prominent.In the background of today's social development,a number of new materials,new craftsmanship and new technologies aiming to improve quality,efficiency,environmental friendliness,energy-efficiency,and environmental protection came into being,and the industrialization of construction,which experienced three ups and two downs in the past,has rebounded strongly,prompting prefabricated building onto the stage of history.The technical innovation has never been easy.Under the new situation of government's strategic planning,high-end leading,and strongly promoting,prefabricated building has enjoyed unprecedentedly development lately.However,it also has to face the problems and challenges in the very process of development,such as the maturity of technology,the stability of performance,the reliability of quality,economical feasibility,market awareness and so on.Among all the challenges,the biggest one is the economical feasibility of prefabricated building.Through research on the full-life cycle overall profits of prefabricated concrete civil buildings,as well as through empirical study of economical efficiency in construction phase,by the theory of "industrial smile curve",in accordance with the principle of "who benefits who pays",combined with the innovation of profit model,this essay puts forward a solution to the sustainable development of prefabricated building.In the meantime,through the analysis of "stakeholders",combined with the specified research on the incremental costs of prefabricated concrete civil buildings,by using the "Williamson inspired model",this essay also proposes the new business model of EPC general contracting and supply chain strategic alliance.There are two innovative points in this essay: one is by jumping out of the traditional thinking that includes covering the construction cost with operation cost,balancing the economic benefits with social benefits,environmental benefits and resource benefits,to face the core problem of how to bring down the cost of construction;through microscopic research and empirical study on and along the industry chain,to explore into the feasibility and practical measures of decremental costs and even “zero increase” or “minus increase”.The other one is to conduct an empirical study on the relationship between prefabricated rate and the costs of construction and installation,prefabricated rate and incremental costs,which comes up with an conclusion: under the same conditions,the prefabricated rate of concrete civil building is approximately positive correlated with the costs of construction and installation,and rises straight upwards;but the prefabricated rate of concrete civil building is not going up with the incremental costs,which continues to decline as the rise of prefabricated rate,when the prefabrication rate reaches 50 %,the incremental cost remains at a fixed level.In addition,as the conditions like building type,project scale,single building storeys,structure system,seismic fortification level,technology plan,climatic conditions,management mode,building height and others vary,the prefabricated rate doesn't maintain a linear relationship with the incremental costs,but a irregular functional relationship.