城市桥梁全生命周期碳排放研究及减碳策略

Research and Carbon Reduction Strategies on Life-cycle Carbon Emissions of Urban Bridges

摘要:

城市桥梁作为城市交通基础设施的核心组成部分，因其单位用材量大、单位碳排放指标高、建设环境位于城市的特点，有必要对其开展专门的碳排放研究。基于排放因子法和全生命周期评价（Life-Cycle Assessment，LCA）方法，构建了城市桥梁全生命周期碳排放计算模型。以上海S3沪奉高速公路工程项目（预制装配法）为案例，计算了其全生命周期的碳排放，最后根据计算结果提出了尽量延长使用寿命、提高钢材的回收率、应用预制装配技术、在运营养护阶段应用新技术与可再生能源等减碳策略，为后续城市桥梁项目的低碳设计、施工、运营提供参考意见。

Abstract:

As a core part of urban transportation infrastructure, it is necessary to conduct specialized research on the carbon emissions of urban bridges due to their high material consumption, high carbon emission indicators and urban construction environment. A life-cycle carbon emission calculation model is established for urban bridges based on the emission factor method and life-cycle assessment (LCA). Taking the Shanghai S3 Hufeng Expressway Engineering Project (prefabricated assembly method) as an example, the carbon emissions over its entire life cycle are calculated. Finally, based on the calculation results, the carbon reduction strategies are proposed, such as extending the service life as much as possible, improving the recovery rate of steel, applying the prefabricated assembly technology, applying the new technologies and renewable energy during operation and maintenance, providing reference for the low-carbon design, construction and operation of follow-up urban bridge projects.