北京中低速磁浮交通示范线(S1线)大悬臂钢拱桥顶推施工研究
张亚丽1张雷1李镭2
Research on Large Cantilever Steel Arch Bridge Incremental Launching Construction of Beijing Medium and Low Speed Maglev Transit Demonstration Line (S1)
ZHANG YaliZHANG LeiLI Lei
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作者信息:1.中国铁路设计集团有限公司，300308，天津；
2.中国中铁六局集团有限公司，100036，北京
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Affiliation:China Railway Design Corporation, 300308, Tianjin, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2021.09.023
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中图分类号/CLCN:U237
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栏目/Col:研究报告
摘要:
北京中低速磁浮交通示范线(S1线)，采用84 m钢拱桥跨阜石路高架，该桥钢结构为世界中低速磁浮线中跨度最大的钢结构。受复杂地形限制，采用步履式顶推施工，顶推条件苛刻；顶推行程长365 m，顶推平面线路为圆曲线、缓和曲线，立面为37‰、-41‰的纵坡；前端最大悬臂63 m，后端最大悬臂48 m。设计了一种新型的84 m钢拱桥的结构形式，通过方案比选分析，确定了和33 m钢梁临时焊接，加设前后导梁、临时索塔的最优顶推方案，并进行了详细的检算；提出了复杂条件下步履式顶推的一系列保障措施，有效解决了钢拱桥大悬臂顶推受力复杂、变形大的问题。
Abstracts:
Beijing medium and low speed maglev transit demonstration line (S1), uses 84 m steel arch bridge across Fushi Road viaduct, the bridge steel structure has the world′s largest span among steel structures of medium and low speed maglev line. Restricted by complex terrain, the walking incremental launching construction is adopted, and the incremental launching conditions are harsh. The length of the incremental launching is 365 m. The pushing plane line is circular curve and easement curve, and the elevation is longitudinal slope of 37‰, -41‰. The maximum front-end cantilever is 63 m, and the maximum cantilever at the rear end is 48 m. A new structure form of 84 m steel arch bridge is designed, through scheme comparison and selection analysis, the optimal pushing scheme of temporary welding with 33 m steel beam, adding front and rear guide beams and temporary cable tower is determined, with a detailed verification calculation. A series of supporting measures for walking incremental launching construction under complex conditions are put forward, which effectively solve the problems of complex force and large deformation of large cantilever pushing of steel arch bridge.
引文 / Ref:
张亚丽，张雷，李镭.北京中低速磁浮交通示范线(S1线)大悬臂钢拱桥顶推施工研究[J].城市轨道交通研究，2021，24(9):104.
ZHANG Yali，ZHANG Lei，LI Lei=1.Research on large cantilever steel arch bridge incremental launching construction of beijing medium and low speed maglev transit demonstration line (S1)[J].Urban Mass Transit，2021，24(9)：104.
ZHANG Yali，ZHANG Lei，LI Lei=1.Research on large cantilever steel arch bridge incremental launching construction of beijing medium and low speed maglev transit demonstration line (S1)[J].Urban Mass Transit，2021，24(9)：104.
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