面向大跨度框架桥顶进施工的既有特制道岔便梁扩大应用改造研究  

Research on the Retrofitting of Existing Specialized Turnout Convenience Beam for Jacking Construction of Large Span Frame Bridges

作　　者：程泳 CHENG Yong(China Railway Fifth Survey and Design Institute Group Co.,Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《国防交通工程与技术》2024年第2期1-6,共6页Traffic Engineering and Technology for National Defence

基　　金：中国铁建股份有限公司科技研发计划(2018-B18)。

摘　　要：为解决大跨度框架桥顶进施工时加固便梁跨度不足问题,对既有特制道岔便梁接长改造,将旧纵梁两跨端切除、栓接新节段梁,然后利用连接件将D型便梁横梁与接长纵梁连接。建立了改造便梁的有限元模型,对其进行了受力性能分析,最后对改造方案进行了试验验证。受力分析表明螺栓连接、纵梁截面强度和拼接板净截面强度均满足规范要求;现场动应力和动态性能测试结果证明了改造方案可行。提供了一种安全性高、施工简单的大跨度框架桥顶进施工的线路架空加固方案,同时提高了既有特制道岔便梁的利用率,降低了工程费用,具有较高的应用推广价值。To address the issue of insufficient span reinforcement for the existing special turnout slab during the incremental launching construction of long-span framework bridges,this paper focuses on retrofitting the special turnout slab by lengthening it.The procedure involves removing the end spans of the old longitudinal beams,connecting new segment beams through bolting,and utilizing connecting elements to link the D-type turnout slab transverse beams with the lengthened longitudinal beams.A finite element model of the retrofitted turnout slab is established,and a comprehensive analysis of its structural performance is conducted.The results of the structural analysis indicate that the bolted connections,longitudinal beam cross-sectional strength,and splice plate net cross-sectional strength all meet the specified standards.Experimental validation of the retrofitting scheme is carried out,and the structural analysis is supported by the field dynamic stress and dynamic performance test results,confirming the feasibility of the retrofitting solution.This study presents a secure and straight forward catenary reinforcement solution for the incremental launching construction of long-span framework bridges,concurrently enhancing the utilization of existing special turnouts,reducing project costs,and demonstrating significant potential for widespread application.

关 键 词：大跨度框架桥 道岔便梁 便梁加固 改造方案 螺栓连接 受力分析 

分 类 号：U449.52[建筑科学—桥梁与隧道工程] U445.72[交通运输工程—道路与铁道工程]