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1、學(xué)兔兔www.xuetutu.com橋梁建設(shè)2014年第44卷第1期(總第224期)BridgeConstruction，Vo1．44，No．1，2014(TotallyNo．224)文章編號：1003—4722(2014)O1—0107—07大跨度鋼管混凝土拱橋安裝線形控制方法研究顧穎，姚昌榮，李亞東，康玲，揭志羽(西南交通大學(xué)橋梁工程系，四川成都610031)摘要：為解決大跨度鋼管混凝土拱橋鋼管拱架設(shè)過程中存在的索力偏差大、線形調(diào)整難、索力與標(biāo)高不匹配等問題，提出“寧高勿低、寧靜勿動”的線形控制原則和一種新的扣索索力計(jì)算方法。以某主跨360m鐵路鋼管混凝土提籃拱橋?yàn)槔?/p>
2、對比新方法的計(jì)算索力與實(shí)際張拉索力的差異，研究各節(jié)段在架設(shè)過程中的線形變化及預(yù)抬高對節(jié)間焊縫寬度的影響。研究結(jié)果及實(shí)際工程表明，該線形控制原則和索力計(jì)算方法具有較高的索力計(jì)算精度，能夠保證節(jié)段重量由纜索吊承載向扣索受力的順利轉(zhuǎn)換，滿足成拱線形光滑的要求，且可實(shí)現(xiàn)扣索一次性張拉達(dá)到線形控制目的。關(guān)鍵詞：拱橋；鋼管混凝土結(jié)構(gòu)；拱肋；安裝；斜拉扣掛懸拼方法；施工控制；索力；預(yù)抬高中圖分類號：U448．22文獻(xiàn)標(biāo)志碼：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
