单线铁路2×72 m曲线槽箱组合梁桥转体方案研究  

Analysis of the Swivel Scheme for a Single-track Railway 2×72 m Span Curved Trough Box Composite Girder Bridge

作　　者：庄碧涛 李前名 李雅香 ZHUANG Bitao;LI Qianming;LI Yaxiang(Guangdong Jiehui Railway Co.,Ltd.,Jieyang 515226,China;China Railway Major Bridge Reconnaissance and Design Institute Co.,Ltd.,Wuhan 430074,China)

机构地区：[1]广东揭惠铁路有限公司,广东揭阳515226 [2]中铁大桥勘测设计院集团有限公司,武汉430074

出　　处：《铁道勘察》2025年第2期136-142,共7页Railway Investigation and Surveying

基　　金：广东省交通运输厅科技计划项目(2021-J-002)。

摘　　要：为了解决大跨度曲线转体桥横向偏心较大、转体稳定性较差等问题,依托揭阳至惠来铁路跨梅汕高铁2×72 m槽箱组合连续梁桥项目,提出一种“中心球铰+单侧环道支撑”的新型多点支撑转体技术。具体实现方式为在转体墩顶设置中心球铰,边跨梁底距转体墩中心22 m处设置环道辅助支撑,通过在辅助支撑上方施加400 kN的压重将转体结构重心控制在球铰与辅助支撑之间,从而实现免称重;转体驱动装置采用“电机+齿轮齿条”形式,设在辅助支撑处,可实现自动精准转体。针对槽箱组合梁的特殊结构形式与受力特点,对转体墩处的主梁截面设置临时加强措施。对比常规单球铰支撑转体和多点支撑转体两种方案的技术经济指标,发现采用多点支撑转体时,转体重量由1.1×10^(5)kN减小到8.15×10^(5)kN,转体驱动力由1630 kN减小到308 kN;在不考虑撑脚作用的情况下,最小抗倾覆稳定系数由1.8提高到2.7;主墩承台尺寸及桩基数量得以优化,由此减少工程投资60万元。研究结果表明,对主梁墩顶截面进行适当加强后,多点支撑转体技术可以较好地适应铁路曲线槽箱组合梁转体桥,且具有明显的技术经济优势。To address the issues of large lateral eccentricity and poor stability in the rotation of long-span curved swivel bridges,a novel multi-point support swivel technology featuring a central spherical hinge+unilateral raceway support was proposed and studied based on the 2×72 m trough-box composite continuous beam bridge project spanning over Meizhou-Shantou High-speed Railway of the Jieyang-Huilai Railway.Specifically,a central spherical hinge was installed at the top of the swivel pier,and an auxiliary raceway support was set up 22 m away from the center of the swivel pier at the bottom of the side span beam.By applying a preload of 400 kN above the auxiliary support,the center of gravity of the swivel structure was controlled between the spherical hinge and the auxiliary support and achieved weight-free measurement.The swivel drive device adopted a motor+gear rack configuration located at the auxiliary support,enabling automatic and precise swiveling.Considering the unique structural form and stress characteristics of the trough-box composite beam,temporary reinforcement measures were applied to the main beam section at the swivel pier.A comparative analysis of the technical and economic indicators between conventional single-point spherical hinge support swiveling and multi-point support swiveling revealed that with the latter,the swivel weight was reduced from 110,000 kN to 81,500 kN,and the swivel driving force was reduced from 1630 kN to 308 kN.Without considering the effect of the outrigger,the minimum anti-overturning stability factor increased from 1.8 to 2.7.Furthermore,the size of the main pier cap and the number of pile foundations were optimized,resulting in a reduction of 600000 yuan in project investment.The study concludes that after appropriate reinforcement of the main beam pier top section,the multi-point support swivel technology can be effectively applied to the swivel bridge with railway curved trough-box composite beams,offering significant technical and economic advantages.

关 键 词：单线铁路 槽箱组合梁 墩顶转体 中心球铰 多点支撑 环道支撑 压重 

分 类 号：U212[交通运输工程—道路与铁道工程] U448.13[建筑科学—桥梁与隧道工程] U445.46