Carbon Emission Of Bidirectional Prestressed Prefabricated Hollow Floor Slab Based On BIM Technology

Melting glaciers and extreme weather are the negative consequences of excessive greenhouse gas emissions.This phenomenon has attracted a great deal of attention in the international community and requires immediate measures to address it.Construction industry has always been a high energy consumption,high emission industries,according to the IPCC investigation found that the energy consumption level of the construction industry accounts for more than 40%of the world,carbon emissions by up to 36%in the condition after industry,therefore,to under the"double carbon"call,achieve global emissions,should be from the perspective of the construction industry,the traditional way of building will be improved greatly.In recent years,prefabricated components with energy saving and emission reduction potential have been concerned by relevant personnel.Therefore,assembly building is a recognized emission reduction promotion in the construction industry.However,up to now,there is not enough research on the quantification of carbon emissions in the physical and chemical stage of prefabricated buildings,and there is a lack of scientific energy consumption measurement system.Based on the analysis of carbon emission research and prefabricated buildings at home and abroad,this paper takes the carbon emission in the physical and chemical stage of the building as the research object,and compares the carbon emission difference between the in-situ slab and SYKB in the physical and chemical stage of the building,so as to study whether the bidirectional prestressed hollow slab(SYKB)has the low-carbon property.According to the relevant carbon emissions,emission reduction measures are formulated,including the gradient carbon price formula from the technical level and institutional incentive level.The main conclusions are as follows:(1)In the analysis of the application of carbon emission trading,it is found that most carbon emission trading mainly acts on three parties(government,enterprises and market)or two parties(government and enterprises),and a few relevant studies on carbon emission trading in situ.The study on the carbon emission distribution of the building in the construction stage,after green construction design.Get the great potential of green construction in emission reduction.Therefore,the concept of carbon emission trading is introduced to stimulate emission reduction by means of policies.(2)The carbon emission calculation models of cast-in-place buildings and prefabricated buildings in the physical and chemical stage of buildings are established.Taking a cast-in-place building in Nanchang city as an example,the carbon emission of physical and chemical stage was calculated.Then the bidirectional prestressed prefabricated hollow slab was used to replace the cast-in-place slab,and the carbon emission was compared.The research shows that the carbon emission per unit area of SYKB is31.93kg CO2e/m~2,and the carbon emission per unit area of in-situ panel is67.1kg CO2e/m~2,which proves that SYKB has objective emission reduction ability.(3)Through energy conservation and emissions reduction measures and new green construction plan adjustment,to calculate the carbon footprint of the sectional works, compared to common construction,various kinds of construction unit area of carbon emissions difference the percentage of the total carbon emissions difference is:the internal transportation,structure engineering,installation engineering 15%41%to 13%11%,decoration engineering,foundation engineering,temporary facilities,10%and10%.(4)The concept of carbon emission gradient price and the formula of carbon emission gradient price are put forward according to the composition of carbon emission and the difficulty of emission reduction in the physical-chemical stage,which is convenient for the formulation of carbon emission right system in the physical-chemical stage.