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高铁钢箱梁跨中单临时支墩顶推施工关键技术

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研究目的:顶推施工过程中,因新建线路小角度斜交既有线路,造成了跨越既有线路段临时支墩难以布置、主梁悬挑跨径大的问题,增加了施工难度,同时给施工的安全性提出了挑战.为解决该问题,本文依托于广汕高铁跨深汕西高速大桥的工程,通过Midas有限元模拟分析以及对实桥应力和位移的监测,研究了高铁钢箱梁跨中单临时支墩顶推施工关键技术.研究结论:(1)跨中无临时支墩顶推方案不满足施工要求;(2)跨中单临时支墩顶推方案顶推施工过程中主梁的应力、位移都处于安全状态,满足施工要求;(3)成桥后的线形、应力状态满足设计预期要求;(4)在路内不允许设置临时支墩的小角度斜交顶推施工中,跨中单临时支墩顶推方案可作为备选方案,本文涉及的施工及监测方法可为类似工程提供一定借鉴作用.
Key Pushing Construction Technologies for High-speed Railway Steel Box Girders with a Single Mid-span Temporary Pier
Research purposes:During the pushing construction process,the small-angle skew intersection between the new and existing lines causes difficulties in arranging temporary piers at the crossing sections and results in large cantilever spans of the main girder.This increases construction difficulty and challenges the safety of the construction.To address this issue,based on the Guangzhou-Shanwei High-speed Railway overpass on the Shenzhen-Shantou West Expressway,through Midas finite element simulation analysis and monitoring of stress and displacement in the actual bridge,the key technologies for pushing construction of high-speed railway steel box girders with a single mid-span temporary pier were studied.Research conclusions:(1)The pushing construction scheme without a temporary mid-span pier does not meet construction requirements.(2)The single mid-span temporary pier pushing scheme ensures that the stress and displacement of the main girder are within safe limits during the pushing construction process,meeting construction requirements.(3)The alignment and stress state of the completed bridge met the design expectations.(4)In small-angle skew pushing construction where temporary piers cannot be set up on the road,the single mid-span temporary pier pushing scheme can be used as an alternative.The construction and monitoring methods discussed in this paper can provide a reference for similar projects.

top pushing constructionasymmetric temporary supporttheoretical analysiscross-line bridgesmall angle skew intersectionhigh-speed railway steel box girder

李浩、刘龙华、罗锦鸿、鞠晨星、张文学

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中国铁路广州局集团有限公司,惠州 516023

中国铁路广州局集团有限公司,广州 510088

北京工业大学,北京 100124

中铁十二局集团第七工程有限公司,长沙 410018

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顶推施工 不对称临时支撑 理论分析 跨线桥 小角度斜交 高铁钢箱梁

中铁十二局集团有限公司科技研究计划中国铁路广州局集团有限公司科技研究开发计划

集团2020研-7-52号2020K039-G

2024

铁道工程学报
中国铁道学会 中国铁路工程总公司 中国中铁股份有限公司

铁道工程学报

CSTPCD北大核心
影响因子：0.996
ISSN：1006-2106
年,卷(期)：2024.41(9)
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