摘要
预制拼装桥墩建造技术是桥梁工程工业化建设的发展趋势,文章依托客运专线铁路32 m简支梁节段预制拼装桥墩,对其结构体系设计、连接方案比选、剪力键布置方式等设计关键点进行论述,并对采用预应力连接技术的节段预制拼装空心墩的力学行为、设计关键参数进行分析研究。结果表明:铁路预制拼装桥墩设计需要考虑合理的墩身刚度、预应力度、预应力钢束布置方案等多重因素。预制拼装空心墩各节段采用钢绞线连接,自锁式锚固体系,在接缝间布置剪力键并涂抹环氧树脂胶,可有效保证接缝面耐久性。本桥的设计为后续铁路节段预制拼装桥墩的设计提供参考和技术储备。
The technology of prefabricated bridge pier is the development trend of bridge industrialization construction.Based on the prefabricated pier of 32 m simply supported beam segments in passenger dedicated railway,this article takes a deeply look at the key points of its structural system design,connection scheme comparison,and shear key layout.Besides,it analyzes and discusses the mechanical behavior and key parameters affecting the design of segment-precast hollow pier with prestressed connection technology.All the studies have shown that,it is necessary to consider reasonable pier stiffness,degree of prestress and arrangement of prestressed steel bundle in the design of prefabricated railway piers.Steel strand connection,self-locking anchorage system,arranging shear keys between the joints with epoxy adhesive,these measures effectively guarantee the durability of joint surface.The design of the bridge provides reference and technical reserve for the design of prefabricated bridge piers subsequently.
作者
张扬
ZHANG Yang(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)
出处
《铁道建筑技术》
2023年第1期105-108,共4页
Railway Construction Technology
基金
中铁第五勘察设计院集团有限公司科研开发计划项目(T5Y2018-B06)。
关键词
预制拼装桥墩
预应力连接
剪力键
桥墩刚度
prefabricated pier
prestressed connection
shear key
pier stiffness
