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ID:36715901
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页数:5页
时间:2019-05-14
《合肥南淝河大桥主桥合龙施工技术》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、桥梁建设2012年第42卷增刊1(总第216期)126BridgeConstruction,Vo1.42,SupplementNo.1,2012(TotallyNo.216)文章编号:1003—4722(2012)S1—0126—05合肥南淝河大桥主桥合龙施工技术田卫东,柳俊峰(中国建筑第五工程局,湖南长沙410000)摘要:合肥南淝河大桥主桥为(60+100+60)m双塔单索面预应力混凝土部分斜拉桥,主桥箱梁采用挂篮悬臂浇筑法施工,边、中跨合龙段采用挂篮吊架辅助合龙施工。为选择有效的合龙措施,分析了温度、荷载和体系转换对合龙的影响,采用有限元软件计算了配重前、后结构位移差值,确
2、定在夜间气温最低时间段合龙;合龙前清理桥面多余临时荷载;在边跨合龙且混凝土强度达到设计强度后解除主墩支座临时锚固;采用砂袋配重43.5t。该桥主梁按照先边跨后中跨的顺序进行合龙。实践表明,大桥主梁合龙线形流畅,结构满足安全使用要求。关键词:部分斜拉桥;箱形梁;合龙;施工技术;措施中图分类号:U448.27;U445.4文献标志码:AConstructionTechniquesforClosureofMainBridgeofSouthFeiheRiverBridgeinHefeiTIANWei—dong,LIUJun—feng(ChinaConstructionFifthEngin
3、eeringCo.,Ltd.,Changsha410000,Abstract:ThemainbridgeoftheSouthFeiheRiverBridgeinHefeiisaprestressedconcreteextradosedbridgewithdoublepylons,singlecableplaneandwithspanarrangement(6O+100+6O)m.Theboxgirderofthemainbridgewasconstructedbytheformtravelercantilevercastingmethodandtheclosuresegments
4、ofthesideandcentra1spanswereconstructedbytheaidoftheformtravelersuspensionsupports.Tochoosetheeffectivemeasuresfortheclosureofthebridge.theinfluencesoftemperatures,loadsandsystemtransformationontheclosurewereanalyzed,thefiniteelementsoftwarewasusedtocalculatethedifferentialvaluesofdisplacemen
5、tofthestructuresbeforeandafterthecounterweightwereplacedanditwasdeterminedthattheclosureshouldbecarriedoutinthenighttimewhenthetemperaturewasminimum.BeforethecloSUre,theunnecessarytemporaryloadsonthedeckwereclearedaway.Afterthesidespanwasclosedandtheconcretestrengthreachedthedesignedstrength,
6、thetemporaryanchoringofbearingsofthemainpierswasreleased.Thecounterweightofsandbagsusedwas43.5tandtheclosureofthebridgeproceededfirstlyfromthesidespansandthentowardsthecentralspan.Theclosurepracticeofthebridgeprovedthatthegeometricshapesoftheclosureweresmoothandthestruc—turecouldsatisfythesaf
7、eservicerequirements.Keywords:extradosedbridge;boxgirder;closure;constructiontechnique;measure1工程概况m,主桥锚索段宽22m,两侧各有宽2.25m的人行合肥南淝河大桥位于规划中环巢湖道路跨南淝道。其中主桥为(60+100+60)m双塔单索面预应河处,是合肥滨湖新区和居巢区之间连接的重要桥力}昆凝土部分斜拉桥(图1),包括11号、12号主墩梁,桥梁全长856m,双向4车道。桥面标准段宽2
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