铁路桥梁建设期不同预制方案碳排放对比分析  

Comparative Analysis of Carbon Emissions from Different Precast Schemes During the Railway Bridge Construction

作　　者：李思慧 李仪弟 黄世清 LI Sihui;LI Yidi;HUANG Shiqing(Sun Engineering Consultants International,Inc.,Guangzhou 510663,China;School of Mechanics and Construction Engineering,Ji??nan University,Guangzhou 510632,China)

机构地区：[1]瀚阳国际工程咨询有限公司,广州510663 [2]暨南大学力学与建筑工程学院,广州510632

出　　处：《铁道标准设计》2024年第12期67-75,共9页Railway Standard Design

基　　金：广东省交通运输行业重点科技项目(2021-QD-010);广州市院士专家工作站科研项目(2020)。

摘　　要：为量化铁路桥梁建设碳排放指标,给铁路桥梁建设进行绿色低碳优化升级,对铁路桥梁建设期不同预制方案产生的碳排放进行研究。通过建立铁路桥梁建设期碳排放计算框架,并结合粤港澳大湾区城际铁路桥梁工程,对节段预制连续刚构桥和整孔预制简支梁桥两种设计方案进行碳排放量计算分析。结果表明:节段预制连续刚构桥方案单位里程建设碳排放量低于整孔预制简支梁桥方案,可降低碳排放量3.96%;建材生产阶段碳排放量占比最高,约95%,运输阶段占比最少,约1%,机械施工阶段占比约4%;整孔预制简支梁方案比节段预制连续刚构方案建材碳排放量高4.37%,运输碳排放量高15.57%,机械碳排放量低4.04%;两种方案的钢材、混凝土碳排放量占建材总碳排放量达94%以上,而整孔预制简支梁方案的混凝土生产碳排放量及运输碳排放量更高,分别比节段预制连续刚构方案高20.27%、19.35%;施工机械主要消耗的能源类型为柴油和电力,占比达99%以上。This study aimed to quantify carbon emission indicators for railway bridge construction and explore green,low-carbon optimization strategies.It focused on analyzing the carbon emissions generated by different precast schemes during the construction phase of railway bridges.A carbon emission calculation framework for the construction phase was established,and the analysis was applied to an intercity railway bridge project in the Guangdong-Hong Kong-Macao Greater Bay Area(GBA).Two design schemes were considered:the segment precast continuous rigid frame bridge and the full-span precast simply supported beam bridge.The results showed that the segment precast continuous rigid frame bridge scheme produced lower carbon emissions per unit distance than the full-span precast simply supported beam bridge scheme,reducing emissions by about 3.96%.The material production stage accounted for the highest proportion of carbon emissions,about 95%,while transportation contributed the least,about 1%,and the mechanical construction stage accounted for about 4%.Compared to the segment-precast continuous rigid frame scheme,the full-span precast simply supported scheme had 4.37%higher material-related carbon emissions,15.57%higher transportation carbon emissions,and 4.04%lower machinery carbon emissions.For both schemes,the carbon emissions from steel and concrete accounted for over 94%of the total material-related emissions.The full-span simply supported beam scheme had higher carbon emissions from concrete production and transportation,which were 20.27%and 19.35%higher,respectively,than those of the segment-precast continuous rigid frame scheme.The primary energy types consumed by construction machinery were diesel and electricity,accounting for over 99%of total energy consumption.

关 键 词：铁路桥梁 碳排放 整孔预制 节段预制 简支梁 连续刚构 

分 类 号：U24[交通运输工程—道路与铁道工程] U44[建筑科学—桥梁与隧道工程]