摘要
针对高速公路改扩建项目中既有桥梁因桥下净空不足需抬升纵断面的问题,该文以广深高速改扩建项目中32.5 m T梁桥改造为研究对象,采用碳排放因子法,测算断柱式顶升、垫石改造为桥墩、拆除重建3种改造方案在不同抬高值时的碳排放量,并对比分析相应的建安费。结果表明:当桥梁纵面抬升到一定高度时,断柱式顶升和拆除重建方案经济效益基本相当,但顶升方案碳排放总量显著低于拆除重建方案;在断柱顶升方案中,材料生产碳排放占86%,场外运输占2%,施工直接碳排放占12%,表明碳排放主要来源为材料生产,其次为施工机械。该研究发现:顶升改造方案不仅符合国家“碳达峰、碳中和”战略目标,还在一定条件下与拆除重建方案经济效益相当,可为桥梁顶升工程方案比选决策提供有力参考。
To lift the longitudinal section of existing bridges in highway reconstruction and expansion projects due to insufficient under-bridge clearance,this study took the reconstruction of a 32.5 m T-beam bridge in the reconstruction and expansion project of the Guangzhou‒Shenzhen Expressway as the research object.By using a carbon emission factor method,carbon emissions of three reconstruction schemes,including broken-column jacking,conversion of bearing pads into bridge piers,and demolition and reconstruction,were calculated under different lifting heights,and the corresponding construction and installation costs were compared.The results show that when the longitudinal section of the bridge is lifted to a certain height,the economic benefits of the broken-column jacking and the demolition and reconstruction schemes are basically equivalent,but the total carbon emissions of the jacking scheme are significantly lower than those of the demolition and reconstruction scheme.In the broken-column jacking scheme,the carbon emissions from material production,off-site transportation,and direct construction account for 86%,2%,and 12%,respectively.This indicates that material production is the main source of carbon emissions,followed by construction machinery.The jacking renovation scheme not only conforms to the“carbon peak and carbon neutrality”policy in China but also achieves equivalent economic benefits to the demolition and reconstruction scheme under certain conditions.The research findings can provide a reference for the decision-making of bridge jacking project schemes.
作者
张鑫敏
胡承泽
高洪波
杨运平
孙志宏
曹鸿猷
ZHANG Xinmin;HU Chengze;GAO Hongbo;YANG Yunping;SUN Zhihong;CAO Hongyou(Guangdong Provincial Highway Construction Co.,Ltd.,Guangzhou,Guangdong 510000,China;CCCC Second Highway Survey and Design Institute,Wuhan,Hubei 430050,China;School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan,Hubei 430079,China)
出处
《中外公路》
2025年第3期232-239,共8页
Journal of China & Foreign Highway
基金
中交第二公路勘察设计研究院有限公司科技研发专项项目(编号:KJFZ-2021-007)。
关键词
T梁
桥梁顶升
改扩建工程
经济分析
碳排放因子
碳排放量
T-beam
bridge jacking
reconstruction and expansion project
economic analysis
carbon emission factor
carbon emission
