摘要
钢管混凝土劲性骨架拱桥的发展需减少外包混凝土环节、提高外包混凝土质量、降低管内混凝土的负担。而铁路混凝土拱桥体量大、恒载重,外包混凝土多次加载易使管内混凝土受力恶化。文章针对这一现状,结合云桂高速铁路南盘江特大桥416 m劲性骨架混凝土拱的设计与施工,分析总结了南盘江特大桥成拱关键技术:(1)采用了较大直径的钢管混凝土劲性骨架,通过增强骨架刚度和承载力来减少外包混凝土分环次数,保证外包混凝土质量;(2)延缓外包混凝土凝结时间,避免混凝土升温过快形成温度裂纹,降低了局部过早凝结出现的应力集中;(3)通过施加二次扣索拉力改善管内混凝土受力状态。这些措施体现了钢管混凝土劲性骨架拱桥建设的先进技术,为建设大跨度混凝土拱桥提供了有益参考。
Development of steel tube concrete rigid skeleton arch bridge needs to reduce the wrapped concrete links to improve its quality,and reduce the burden of inner-tube concrete.The railway concrete arch bridge is heavy with a large body,the repeated loading of wrapped concrete cause the stress state of inner-tube concrete deteriorated.Combined with the design and construction of 416 m rigid skeleton concrete arch bridge of Nanpanjiang Bridge on Yunnan-Guangxi Railway,The large diameter steel tube concrete skeleton is used to reduce the wrapped concrete links by enhancing stiffness and bearing capacity of the skeleton to increase the concrete quantity.The concrete condensation time is delayed to avoid the temperature crack formed when the concrete is quickly heated up,which reduces the stress concentration of local premature condensation.To improve stress condition of the inner-tube concrete through additional tension for the skeleton.These measures reflect the advanced technology of steel tube concrete rigid skeleton arch bridge construction and provide beneficial reference for the construction of large-span concrete arch bridge.
作者
何庭国
任伟
徐勇
陈克坚
HE Tingguo;REN Wei;XU Yong;CHEN Kejian(China railway eryuan engineering group Co.,Ltd.,Chengdu 610031,China)
出处
《高速铁路技术》
2018年第S02期58-61,共4页
High Speed Railway Technology
基金
铁道部科技研究开发项目(2010G018-A-1)
关键词
云桂高速铁路
南盘江特大桥
劲性骨架
混凝土拱桥
Yunnan-Guangxi railway
Nanpanjiang Bridge
rigid skeleton
concrete arch bridge
作者简介
何庭国(1971-),男,教授级高级工程师。
