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时间:2020-03-25
《港珠澳大桥青州航道桥主梁合龙施工技术.pdf》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2017年第47卷第5期(总第246期)BridgeConstruction,V01.47,No.5,2017(TotallyNo.246)117文章编号:1003--4722(2017)05--0117--05港珠澳大桥青州航道桥主梁合龙施工技术赵晓晋1’2,景强3,贺拴海2,王凌波2(1.山西省交通科学研究院桥梁工程防灾减灾山西省重点实验室,山西太原030006;2.长安大学公路学院旧桥检测与加固技术交通行业重点实验室,陕西西安710064;3.港珠澳大桥管理局,广东珠海519015)摘要:港珠澳大桥青州航道桥为(110+236+
2、458+236+110)m的斜拉一连续组合体系双塔双索面钢箱梁斜拉桥,有索区主梁采用悬臂拼装方案施工,无索区主梁采用整体吊装方案施工,两侧次边跨及中跨均设1个合龙段。为保证主梁合龙施工精度及质量,结合结构体系特点,次边跨合龙采用顶推+配切合龙的方法,按照先合龙、后张拉合龙段斜拉索的工序进行合龙施工;中跨合龙采用配切合龙的方法;在合龙施工中,采取了免压重合龙观测技术,并采取折线配切方法进行合龙段精细配切。该桥主梁合龙后,次边跨及中跨合龙口最大高差分别为6mm和1mm,轴线偏差均在5mm以内,焊缝宽度均为10~15mm。实践结果表明:该桥合龙施工
3、技术切实可行,施工简便,合龙精度满足施工要求。关键词:跨海大桥;斜拉桥;钢箱梁;顶推合龙;配切合龙;合龙技术;桥梁施工中图分类号:U448.27;U445.4文献标志码:AConstructionTechniquesforClosureofMainGirderofQingzhouShipChannelBridgeofHongKong-Zhuhai-_MacaoBridgeZHAOXiao-jin1一,JINGQiang3,HEShuan-hai2,WANGLing—bo2(1.KeyLaboratoryofBridgeEngineeringD
4、isasterPreventionandReductionofShanxiProvince,ShanxiTransportationResearchInstitute,Taiyuan030006,China;2.KeyLaboratoryofOldBridgeDetection8LReinforcementTechnologyofMinistryofTransport。SchoolofHighway,Chang’anUniversity,Xi7an710064,China;3.HongKong—Zhuhai—MacaoBridgeAuthor
5、ity,Zhuhai519015,China)Abstract:TheQingzhouShipChannelBridgeoftheHongKong-Zhuhai—MacaoBridgeisaca—ble-stayedandcontinuoussystemsteelboxgirdercable-stayedbridgewithdoublepylons,doublecableplanesandwithspanarrangement(110+236+458+236+110)m.Themaingirderofthebridgeintheareawit
6、hthestaycableswaserectedbytheschemeofcantileverassemblingwhileintheareawithoutthestaycableswaserectedbytheschemeofintegralliftingandinstallation.Atthesecondarysidespansoneithersideandthecentralspan,eachoneclosuresegmentwasar—ranged.Toensuretheconstructionaccuracyandqualityo
7、ftheclosureofthemaingirderandinconsiderationofthestructuralcharacteristicsofthebridge,theclosureofthesecondarysidespanswascarriedout,usingthepushing+matchcuttingmethodandinthesequenceofclosingthespansfirstandtensioningthestaycablesoftheclosuresegmentsthen.Theclosureofthecen
8、tralspanWascarriedout,usingthematchcuttingmethodandintheclosureconstructionofthesp
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