Greenhouse Gas Emission Analysis Of Prefabricated Construction Based On BIM And GIS

In recent years,the green development of the construction industry,as one of the focuses of attention of all walks of life in society,has become a hot topic explored in the field of construction management.Therefore,how to reasonably and effectively reduce the amount of greenhouse gas emissions in buildings is the key point to be considered in the current stage.Prefabricated buildings are the types of buildings that the Chinese government has vigorously promoted,and the level of environmental impact throughout its life cycle needs further exploration.Based on the summarization of existing research results and literature at home and abroad,this research combines the innovation of analytical models and analytical tools to open up new methods and methods for the research of environmental impact benefits of fabricated buildings.Specifically,in this study,with the help of the BIM model,the environmental impact of construction materials or components is calculated and processed using the LCA method,and the Monte Carlo simulation method is used to obtain the probability distribution of greenhouse gas emissions from prefabricated buildings.The buffer analysis and network analysis techniques in GIS perform spatial analysis on the obtained data and innovate the LCA+BIM+GIS model that combines the advantages of the three model technologies.The study yielded the following results:(1)The model innovation of LCA + BIM + GIS is of great significance to the study of the impact of prefabricated building environmental impact.The model integrates the advantages of each of the three model technologies to facilitate the researcher and industry-related personnel on environmental impact data.Search and utilization are used to improve the accuracy of analysis and the scientific nature of relevant decisions;(2)The case study found that there are three characteristics in the three stages of production,transportation,and installation of prefabricated components:(1)In the production stage of prefabricated components,steel reinforcement and concrete are indispensable for such construction and they are used in huge quantities.The amount of greenhouse gas emissions generated by materials is usually huge.At the same time,the use of electricity as one of the basic energy sources can also have a certain degree of impact on the concentration of greenhouse gases in a certain area.Although hot-dip galvanized steel pipes are used as embedded parts,In terms of the amount of use,it is less compared to the necessary materials for construction such as reinforced concrete or concrete,but due to the large carbon emission factor of hot-dip galvanized steel pipes,its use has a considerable impact on greenhouse gases;(2)In the prefabricated components During the transportation phase,the amount of greenhouse gas emissions of different components is mainly related to the transportation distance and the amount of component work.(3)Based on the calculation data of the case,it can be seen that the installation phase of prefabricated building construction is the phase with the least greenhouse gas emissions in the three phases.,and the main reason for generating greenhouse gas emissions is the machinery that is applied during installation,such as tower cranes.Such as the consumption of diesel during the work process to generate greenhouse gases.3)Uncertainty analysis results of greenhouse gas emissions show that due to the construction of a certain degree of new construction waste during the construction of traditional buildings,and these wastes have large uncertainties,the uncertainty of traditional building construction Larger than prefabricated buildings.(4)After comparing the new type of fabricated structure with the traditional casttype building,it is found that the degree of influence of the fabricated structure on the environmental impact of greenhouse gas emissions is reduced to some extent compared with the traditional building model.However,it is worth noting that in this study case,the greenhouse gas emissions per square meter of traditional in-situ building transportation stage was 4.09 kg,and the greenhouse gas emission per square meter was 6.71 kg in the stage of prefabricated construction.Therefore,compared to traditional cast-in-place buildings,prefabricated buildings do not necessarily reduce greenhouse gas emissions during the transportation phase.