狮子洋大桥锚碇底板大体积混凝土控裂技术
Crack Control Technology of Mass Concrete in Anchor Floor of Shiziyang Bridge
彭程 1董自前 2赵川江 2刘鑫洋 2谢威 3徐伟 4丁庆军5
作者信息
- 1. 广东长大工程检测有限公司,中山 528400
- 2. 保利长大工程有限公司,广州 510620
- 3. 武汉纺织大学材料科学与工程学院,武汉 430200
- 4. 中国地质大学工程学院(武汉),武汉 430079
- 5. 武汉理工大学材料科学与工程学院,武汉 430070
- 折叠
摘要
狮子洋大桥为主跨2 180 m的双层钢桁悬索桥,其锚碇基础为同类型桥梁世界第一.锚碇底板采用C40大体积混凝土,其结构尺寸超大、工程区域气候炎热、腐蚀环境恶劣,控裂要求高、难度大.在温度应力仿真分析的基础上开展温控设计,现场采取分层分块浇筑、优选原材料、优化配合比、控制原材料温度、混凝土施工质量控制、控温养护和大体积混凝土智能温控系统等综合温控措施控制底板大体积混凝土温度裂缝.现场监测结果表明,最高温度、内表温差和降温速率等关键指标均在温控标准范围内,锚碇底板未发现有害温度裂缝,温控效果良好,达到了预期的温控目标.
Abstract
Shiziyang Bridge is a double-deck steel truss suspension bridge with a main span of 2 180 meters,and its an-chorage foundation is the first bridge of the same type in the world.The anchor base plate is made of C40 high-volume concrete,with oversized structural dimensions,and the construction area is characterized by a hot and corrosive environ-ment,high requirements for crack control,and significant construction difficulty.Based on temperature stress simulation analysis,temperature control design was implemented,and comprehensive temperature control measures were taken on site,including layered and segmented pouring,optimal selection of raw materials,optimized mix proportions,control of raw material temperatures,concrete construction quality control,temperature control curing,and an intelligent tempera-ture control system for high-volume concrete,to control temperature-induced cracking in the anchor base plate.The on-site monitoring results showed that key indicators such as maximum temperature,internal surface temperature difference,and cooling rate were all within the temperature control standard range.No harmful temperature-induced cracks were found in the anchor base plate,indicating good temperature control effectiveness and the achievement of the expected temperature control objectives.
关键词
锚碇底板/大体积混凝土/控裂技术/仿真分析/智能温控系统Key words
anchor base plate/high-volume concrete/crack control technology/simulation analysis/intelligent temperature control system引用本文复制引用
出版年
2024
NETL
NSTL
万方数据