Abstract:Based on the new construction project of Caobao Road Expressway, the quota list analysis method is used to calculate the carbon emissions of the shield tunneling shaft on Hechuan Road. By analyzing the composition and main sources of carbon emissions, the proportion of carbon emissions under different classification modes of the tunneling shaft structure is obtained, and the targeted carbon reduction paths and methods are proposed. The research results indicate that during the production, transportation and construction stages of building materials, the total carbon emissions from shield tunneling shafts can reach 20 850 t of CO2. Classified by materials, machinery and labor, the carbon emissions of each component account for approximately 87.7%, 11.9%, and 0.4%. The carbon emissions during the production and transportation phase of building materials are much higher than the sum of mechanical energy consumption and manual carbon emissions during the construction phase. Although the quality of precipitation wells accounts for a relatively small proportion, it has a great impact on the carbon emission calculation of the project in the division, and it is a factor that needs to be considered in carbon emissions accounting. The quality proportion and carbon emission proportion of joint water-stop materials and waterproofing materials are very small, and can be appropriately considered or ignored according to the accuracy requirements of carbon emission accounting. In terms of infrastructure construction, the effective measures can be taken to reduce carbon emissions by using low-carbon building materials, electrification of building materials and earthwork transportation machinery, encouraging the use of biodiesel in construction machinery energy, improving the level of construction waste resource management, and improving the utilization rate of turnover materials in project measures.
