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时间:2019-02-04
《石武客运专线跨京珠公路特大桥预应力混凝土连续梁桥施工监控技术》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、·桥梁·石武客运专线跨京珠公路特大桥预应力混凝土连续梁桥施工监控技术闰林栋(京广铁路客运专线河南有限责任公司,郑州450003)摘要:施工监控是确保连续梁桥成桥线形及内力达到设计要求的一项重要技术,以石武客运专线跨京珠高速公路(80.6+128+80.6)m特大跨径连续梁桥为工程背景,重点阐述其线形控制及应力监测的技术要求、流程及措施,包括有限元建模、立模高程及预拱度的设置、测点布置等。实桥监控结果表明:各节段测量值与预期计算值相符,线形误差均满足《客运专线铁路桥涵工程施工质量验收暂行标准》(铁建设[2005]160号)要求,
2、合龙精度及成桥线形较好;各施工阶段测点应力实测值与理论值偏差较小,且应力值随施工进度的变化规律基本一致,说明全桥施工满足设计要求,结构处于良好工作状态。关键词:高速铁路;连续梁桥;悬臂施工;线形控制;应力监测中图分类号:U448.215文献标识码:B文章编号:1004—2954(2011)09—0055—04ConstructionMonitoringfortheContinuousBeamSuper-largeBridgeOver-crossingBeijing—ZhuhaiExpresswayonShijiazhuang-
3、WuhanPassengerDedicatedLineYanLindong(HenanCorporation,Beijing-GuangzhouPassengerDedicatedRaiLway,Zhengzhou450003)Abstract:Constructionmonitoringisnecessarytoensurethattheconfigurationandinternalforcesofthecontinuousbeambridgecanmeetthedesigndemands.Thisarticleconsi
4、dersthesuperlongspancontinuousbeambridge(80.6+128+80.6)monShijiazhuang—Wuhanpassengerdedicatedrailwayover—crossingBeijing—Zhuhaiexpressway,describesindetailthetechnicalrequirements,proceduresandmeasuresoftheconfigurationcontrolandmonitoring,includingthefiniteelement
5、modeling,initialmouldheightandprecamberseting,layoutofmeasuringpointsetc.Resultsofmonitoringindicatedthatthemeasuredvalueswereveryclosetotheestimatedvaluesineachsection;thelinearerrorsmettherequirementsof‘‘TemporaryStandardsforConstructionQualityAcceptanceofRailwayB
6、ridgeEngineeringofPassengerDedicatedLines”;theaccuracyofclosureandbridgeconfigurationwerefairlygood;thedeviationsofthemeasuredvaluesfromtheactualvalueswereprettysmallinallconstructionstages;thevariationsofmonitoringvalueswerebasicallyagreeablewiththeconstructionprog
7、ress.Alltheseshowthattheconstructionofthebridgewellagreeswiththedesignandthestructuresareingoodcondition.Keywords:High·speedrailway;Continuousbeambridge;Cantileverconstruction;Configurationcontrol:Stressmonitoring施工监控是施工技术的重要组成部分,并始终贯算,给出后续各施工阶段的高程及内力反馈数据,用以穿于桥梁施工中。
8、桥梁施工监测与控制即是对施工中指导和控制施工,保证桥梁线形和内力符合设计的重要环节过程进行监测与控制,以保证施工过程中要求。结构处于安全状态。根据结构的实际状态,对利悬臂施工方法在我国预应力连续梁桥中应用广用各种测试及监测手段获取的数据进行跟踪修正计泛,在施工期间不影响桥下通
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