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大跨度桥梁超高性能混凝土-钢组合桥面铺装应用技术研究
作者：张志豪1，2，陈露一1，2，伍贤智1，2，王敏1，李信1，2
（1.桥梁结构健康与安全国家重点实验室，湖北 武汉 430034；2.中铁桥研科技有限公司，湖北 武汉 430034）
摘要：以武汉军山长江大桥、沪苏通长江大桥主航道桥、遵余高速飞龙湖乌江大桥等大跨度桥梁为例，对超高性能混凝土（UHPC）组合桥面体系特征、材料性能以及铺装应用技术进行研究。结果表明，配有钢筋网的高强髙韧UHPC薄层通过栓钉与钢桥面板结合形成组合桥面结构，根据大跨度桥梁的坡度设置，新拌UHPC扩展度宜控制在500~600 mm，钢纤维与硬化基体粘结形成受力共同体，具有致密的内部微结构，高温蒸汽养护与自然保湿养护环境下的UHPC性能均可稳定增长；与冷拌环氧树脂（ERE）铺装体系相比，UHPC组合桥面板顶板底部、U肋底部、横隔板开口处最大应力幅分别降低58.9%、41.3%、24.9%。将UHPC的固体组分提前预混，采用专业的机械化设备可实现UHPC在大跨度桥梁中的快速化大规模生产应用。
关键词：超高性能混凝土；钢组合桥面体系；大跨度桥梁；桥面铺装；施工技术
中图分类号：TU528.31 文献标识码：A 文章编号：1001-702X（2022）06-0091-06
Study on the technology of steel composite bridge deck pavement with ultra high performance concrete for long span bridges
ZHANG Zhihao1，2，CHEN Luyi1，2，WU Xianzhi1，2，WANG Min1，LI Xin1，2
（1.State Key Laboratory for Health and Safety of Bridge Structures，Wuhan 430034，China；
2.China Railway Britech Co. Ltd.，Wuhan 430034，China）
Abstract：Taking Wuhan Junshan Yangtze River Bridge，main channel bridge of Shanghai-Suzhou-Nantong Yangtze River Bridge and Feilonghu Wujiang Bridge of Zunyi-Yuqing expressway as examples，the characteristics，material properties and pavement application technology of ultra high performance concrete（UHPC） composite deck system are studied. The results show that the high strength and high toughness UHPC thin layer with reinforcing mesh is combined with the steel deck plate to form a composite bridge deck structure through shear stud. According to the slope setting of the long-span bridge, the expansion of the fresh UHPC should be controlled between 500 mm and 600 mm. The steel fiber in the composite bridge deck is bonded with the hardened matrix to form a stress community，which has a compact internal microstructure. The performance of UHPC can increase steadily under high temperature steam curing and normal temperature natural curing environment. Compared with the ERE paving system，the maximum stress amplitude at the bottom of the top plate，the bottom of the U rib and the opening of the diaphragm of UHPC composite deck decreased by 58.9%，41.3% and 24.9% respectively. The solid components in UHPC can be premixed in advance，and the large-scale production and rapid application of UHPC can be realized by using automatic paving equipments.
Key words：UHPC，steel composite deck system，large span bridge，bridge deck pavement，construction technique