城市立交桥桥墩上部盖梁UHPC120混凝土实践  

Practice of UHPC120 Concrete for the Upper Cover Beam of Urban Interchange Piers

作　　者：刘烨河 刘福峰 LIU Yehe;LIU Fufeng(Guangzhou Rail Transit Construction Supervision Co.,Ltd.,Guangzhou 511400,China;Hunan Vocational and Technical College of Non-Ferrous Metals,Zhuzhou 412006,China)

机构地区：[1]广州轨道交通建设监理有限公司,广东广州511400 [2]湖南有色金属职业技术学院,湖南株洲412006

出　　处：《上海建材》2024年第1期56-60,共5页Shanghai Building Materials

摘　　要：城市立交桥盖梁质量要求极高,为达到设计指标,应用UHPC120混凝土是一种新的解决方案。采用UHPC120混凝土一次成型施工来保证其结构力学性能要求,但盖梁体积大,内部最高温度可达120℃以上,温度应力和收缩应力叠加,UHPC120混凝土实体容易开裂,甚至报废。通过实际工程应用,找到解决方案。UHPC120 concrete is an innovative solution to satisfy the high-quality requirement of the cover beam of an urban overpass bridge.The UHPC120 concrete was used in one-stage construction to ensure the structural mechanics and performance requirements.However since the cover beam had a large volume and the maximum internal temperature could be over 120℃,the superposition of temperature stress and shrinkage stress would trigger the crack or even scrap of UHPC120 entity.This study has reviewed the actual engineering application and gives the solution.

关 键 词：UHPC120 一次成型 盖梁 温度应力 收缩应力 开裂 

分 类 号：TU528[建筑科学—建筑技术科学]