平潭海峡公铁两用大桥元洪航道桥桥塔墩顶钢梁施工技术
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摘要
平潭海峡公铁两用大桥元洪航道桥为主跨532m的双塔钢桁混合梁斜拉桥,钢梁主桁为N形桁架,桁宽15.0m,桁高13.5m,标准节间长14.0m。桥塔墩顶钢梁共7节间,在工厂分为4个节段整体加工成两节间全焊结构,海上运输至墩位处后采用浮吊架设。采用墩旁托架辅助架设钢梁,托架在工厂制造成整体,浮运至墩位,利用大型浮吊整体安装。墩顶钢梁采用大型浮吊分节段吊装至航道桥边跨侧墩旁托架,采用连续千斤顶滑移及三向千斤顶精调就位,实现了在复杂海洋环境下斜拉桥钢梁墩顶段及施工辅助设施模块化、装配化和标准化施工。
The Yuanhong Ship Channel Bridge of Pingtan Straits Rail-cum-Road Bridge is a two-pylon steel truss-concrete composite girder cable-stayed bridge with a main span of 532 m.The steel girder on the pylon pier top consists of 7 panels.In the fabrication process,every four segments were integrally fabricated to be two panels of fully-welded structure,which was subsequently transported to the bridge site and monolithically lifted and installed by the large-scale floating crane at the piers.The pier-side brackets to the pylons were also fabricated to be integral components in the factory,and then,floated to the pier sites,and installed as an entirety by the floating crane.The pier-top steel girder was lifted segment by segment to the pier-side brackets in the side span of the ship channel bridge by large-scale floating crane.The steel girder was slid by the continuous jacks and accurately moved into position by three-dimensional jacks.the modularization factory manufacture and field assembly and standardized construction of the pier-top steel girder segments and auxiliary construction facilities of the cable-stayed bridge in the complicated marine environment were realized.
The Yuanhong Ship Channel Bridge of Pingtan Straits Rail-cum-Road Bridge is a two-pylon steel truss-concrete composite girder cable-stayed bridge with a main span of 532 m.The steel girder on the pylon pier top consists of 7 panels.In the fabrication process,every four segments were integrally fabricated to be two panels of fully-welded structure,which was subsequently transported to the bridge site and monolithically lifted and installed by the large-scale floating crane at the piers.The pier-side brackets to the pylons were also fabricated to be integral components in the factory,and then,floated to the pier sites,and installed as an entirety by the floating crane.The pier-top steel girder was lifted segment by segment to the pier-side brackets in the side span of the ship channel bridge by large-scale floating crane.The steel girder was slid by the continuous jacks and accurately moved into position by three-dimensional jacks.the modularization factory manufacture and field assembly and standardized construction of the pier-top steel girder segments and auxiliary construction facilities of the cable-stayed bridge in the complicated marine environment were realized.
引文
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[2]张立超.平潭海峡公铁两用大桥通航孔桥桥塔墩承台施工技术[J].桥梁建设,2017,47(6):1-6.
[3]中铁大桥勘察设计院集团有限公司.平潭海峡公铁两用大桥施工图设计[Z].武汉,2013.
[4]马晓东.平潭海峡公铁两用大桥总体施工方案[J].桥梁建设,2017,47(2):1-6.
[5]福建省气候中心.平潭海峡公铁两用大桥气象环境专题分析报告[R].福州,2012.
[6]沈大才,马晓东.平潭海峡公铁两用大桥钢梁架设关键技术[J].桥梁建设,2018,48(4):6-11.
[7]胡汉舟,刘自明,秦顺全,等.武汉天兴洲公铁两用长江大桥斜拉桥技术总结[M].北京:中国铁道出版社,2009.
[8]王东辉.平潭海峡公铁两用大桥简支钢桁梁制造关键技术[J].桥梁建设,2018,48(3):1-4.
[9]朱治宝,马长飞,王波,等.平潭海峡公铁两用大桥施工安全风险评估[J].桥梁建设,2017,47(1):12-16.
[10]刘应龙,蔺鹏臻,宋于祺,等.银西高铁银川机场黄河特大桥钢桁梁施工技术[J].桥梁建设,2018,48(5):114-119.