大跨度钢管混凝土拱桥安装线形控制方法研究

《大跨度钢管混凝土拱桥安装线形控制方法研究》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、学兔兔www.xuetutu.com桥梁建设2014年第44卷第1期(总第224期)BridgeConstruction，Vo1．44，No．1，2014(TotallyNo．224)文章编号：1003—4722(2014)O1—0107—07大跨度钢管混凝土拱桥安装线形控制方法研究顾颖，姚昌荣，李亚东，康玲，揭志羽(西南交通大学桥梁工程系，四川成都610031)摘要：为解决大跨度钢管混凝土拱桥钢管拱架设过程中存在的索力偏差大、线形调整难、索力与标高不匹配等问题，提出“宁高勿低、宁静勿动”的线形控制原则和一种新的扣索索力计算方法。以某主跨360m铁路钢管混凝土提篮拱桥为例，

2、对比新方法的计算索力与实际张拉索力的差异，研究各节段在架设过程中的线形变化及预抬高对节间焊缝宽度的影响。研究结果及实际工程表明，该线形控制原则和索力计算方法具有较高的索力计算精度，能够保证节段重量由缆索吊承载向扣索受力的顺利转换，满足成拱线形光滑的要求，且可实现扣索一次性张拉达到线形控制目的。关键词：拱桥；钢管混凝土结构；拱肋；安装；斜拉扣挂悬拼方法；施工控制；索力；预抬高中图分类号：U448．22文献标志码：AStudyofAlignmentControlMethodforInstallationofArchRibsofLongSpanCFSTArchBridgeGUYi

3、ng，YAOChang—rong，LIYa—dong，KANGLing，JIEZhi。yu(DepartmentofBridgeEngineering，SouthwestJiaotongUniversity，Chengdu610031，China)Abstract：Toresolvetheproblemsthatthefasteningstayforcedeviationsaregreat，thea—lignmentadjustmentofthearchribsisdifficultandthestayforcesandelevationdonotmatchintheins

4、tallationprocessofthesteeltubearchribsoflongspanconcrete—filledsteeltube(CFST)archbridge，thealignmentcontrolprincipleof”keepingtheinstalledblocksofthearchribshighratherthanlowandkeepingtheblocksstationaryratherthanmovable”andakindofthenewcal—culationmethodforthestayforcesweredeveloped．Arai

5、lwayCFSTbaskethandlearchbridgewithamainspan360mwastakenasanexample，thedifferencesbetweenthestayforcescalculat-edaccordingtothedevelopednewmethodandtheactualtensionedstayforcesintheinstallationwerecomparedandthechangesofthealignmentofthearchribsandtheinfluencesofpreraisingofthearchribblocks

6、ontheweldingseamwidthoftheblocksintheinstallationofthedifferentblockswerestudied．Theresultsofthestudyandtheactualinstallationindicatethatthealign—mentcontrolprincipleandthenewcalculationmethodhavehighcalculationprecisionofthestayforces，canensurethefavorabletransformationoftheblockweightcar

7、riedbythecablecranetotheweighttobecarriedbythefasteningstays，cansatisfytherequirementforthesmoothalign—mentofthecompletedarchribsandmoreover，canachievethealignmentcontrolgoaloftensio—ningthestaysinonetime．Keywords：archbridge；concrete—filledsteeltubestructure；a