2011年5月上第40卷第340期
施工技术
CONSTRUCTION TECHNOLOGY
哪吒大桥主缆架设施工影响因素分析
陈淮栗金营李杰夏伟（郑州大学土木工程学院河南郑州450001）
[摘要］悬索桥主缆架设精度主要取决于正确的空缆状态确定和架设过程中准确的参数控制，通过计算哪吒大桥的主缆空缆线形分析主缆无应力案长变化、温度变化、跨径变化和预抬高量等4种施工因素对哪吒大桥主缆各跨跨中标高的影响得出结论：主缆架设的4种施工影响因素对主缆跨中标高的影响基本成线性关系；主缆架设的施工影响因素是相互作用且同时存在的在主缆架设及空缆线形调整时应综合考虑上述因素的影响进行必要的主缆空缆线形调整及修正工作。计算所得的空缆线形理论值及4种施工因素对主缆跨中标高的影响关系可用于指导脚吒大桥主缆架设的施工，
【关键词】悬索桥；主缆；空缆线形；有限元法
[中图分类号】U448.25
[文献标识码】A
[文章编号］1002-8498(2011) 09-0039-04
Analysis on the Influence Factors for the Main
Cable Construction of NazhaBridge
Chen Huai , Li Jinying , Li Jie , Xia Wei
( School of Ciil Engineering , Zhengzhour U/nizersity , Zhengzhoa , He' nan450001 , China)
Abstract: The construction accuracy of main cable of suspension bridge depends on the correct state of the stressless cable and the accurate parameters control under construction. Through calculation of the stressless main cable shape of Nazha Bridge with the finite element software , the authors analyze influences of the four main construction factors to the elevation of the middle span of the main cable. The factors include the change length change , temperature change , span change and pre-rising displacement of the stressless main cable. The calculation results show that the middle span' s elevation is liner with the four construction factors , and the four construction factors are interaction and simultaneous existence for each other. So those factors should be synthetically considered and necessarily modified under construction. The four construction factors and theoretical value of the stressless cable shape can guide construction of Nazha bridge's main cable.
Key words: suspension bridge; main cable; the shape of the stressless main cable; finite element method
工程概况
哪吒大桥是河南省对口援助四川省江油市地震灾后恢复重建项目，为主跨252m的双塔单跨钢桁加劲梁悬索桥，属于半漂浮体系，随道式锚淀]。考虑到大桥的施工工期、桥址环境和施工条件等要求主缆采用预制高强镀锌平行钢丝成品索共有4 根，每侧2根,每根成品索由451丝Φ5mm镀锌钢丝组成，钢丝标准强度1770MPa，成品索外包双层 HDPE护套主缆通过主索鞍水平转向以满足铺锭
[收稿日期】2010-12-09
[基金项目］河南省杰出人才计划项目(084200510003)
【作者简介］陈淮郑州大学土木工程学院教授，博士河南省郑州市科学大道100 号450001，电话：（0371)63887967,E-mail:zdtm@
zzu. edu. en 万方数据
39
隧道间距要求江油岸主缆水平转角2.708°，北川岸主缆水平转角3.246°，江油岸锚入口设转索鞍北川岸锚啶入口处设散索套主缆锚固在锚体底端采用冷铸墩头锚具。哪吒大桥主缆架设采用先导索牵引法牵拉到位后再进行主缆的入槽施工入槽后主缆空缆线形就已确定不能再变动主缆及钢桁加劲梁的成桥线形是基于主缆空缆状态的线形。在后续吊杆与索夹、钢桁加劲梁自重和二期恒载作用下形成的主缆空缆时架设的好坏对悬索桥成桥线形有直接关系。哪大桥主缆跨径布置为56.1m +252m+39.5m主缆矢高25.2m,失跨比为1/10，跨中主缆中心至桥面高2.35m
悬索桥主缆架设精度主要取决于正确的空缆状