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1、大跨徑混合梁斜拉橋合龍技術(shù)研究與實(shí)踐劉明虎,譚皓,徐國平,趙燦暉83文章編號(hào):1003—4722(2011)04—0083一O5大跨徑混合梁斜拉橋合龍技術(shù)研究與實(shí)踐劉明虎,譚皓,徐國平,趙燦暉(1.中交公路規(guī)劃設(shè)計(jì)院有限公司,北京100088;2.西南交通大學(xué)土木學(xué)院,四川成都610031)摘要:為研究大跨徑混合梁斜拉橋中跨合龍方案與關(guān)鍵技術(shù),以主跨926m的鄂東長(zhǎng)江公路大橋?yàn)楸尘斑M(jìn)行研究。綜合考慮該橋結(jié)構(gòu)受力與構(gòu)造特點(diǎn),通過溫度、頂推力及結(jié)構(gòu)局部承載力的分析,確定該橋采用加載合龍方案。合龍過程中實(shí)施了合龍口線形調(diào)整、塔梁臨時(shí)約束解除
2、與頂推、勁性骨架設(shè)置等關(guān)鍵技術(shù),使該橋中跨合龍始終處于受控狀態(tài),合龍過程十分順利,實(shí)現(xiàn)了高精度合龍。關(guān)鍵詞:鄂東長(zhǎng)江公路大橋;斜拉橋;混合梁;合龍;方案;無應(yīng)力狀態(tài)控制法;橋梁施工中圖分類號(hào):U448.27;U445.4文獻(xiàn)標(biāo)志碼:AResearchandPracticeofClosureTechniquesforLongSpanHybridGirderCable-StayedBridgeLIUMing—hu,TANHao,XUGuo—ping,ZHAOCan-hui(1.CCCCHighwayConsultantsCo.,Ltd.,
3、Beijing100088,China;2.SchoolofCivilEngineering,SouthwestJiaotongUniversity,Chengdu610031,China)Abstract:Tomakeresearchonthecentra1spanclosureschemesandtherelatedkeytech—niquesforlongspanhybridgirdercable—stayedbridge,theEdongChangjiangRiverHighwayBridgewithamainspanof92
4、6mwastakenasanexampleandstudied.Thestructuralforcecon—ditionsandstructuralcharacteristicsofthehighwaybridgewerecomprehensivelytakenintoae-countandtheclosureschemeofloadingwasdeterminedforthebridgethroughanalysisofthetemperatureload,pushingforceandlocalbearingcapacityoft
5、hestructure.Intheprocessoftheclosure,thekeytechniquesforadjustingtheclosuregapalignment,releasingthetemporaryre-straintbetweenthepylonandgirder,pushingandsettingofthestiffeningframewereemployedandtheclosureofthecentralspanofthebridgewashencecarriedoutinthecontrolledstat
6、eallthetime.Theclosureprocessofthecentralspanwasverysmoothandthehighlyaccurateclosurewasfinallyachieved.Keywords:EdongChangJiangRiverHighwayBridge;cable—stayedbridge;hybridgirder;closure;scheme;unstressedstatecontrolmethod;bridgeconstruction1引言以鄂東長(zhǎng)江公路大橋主橋?yàn)槔?,?duì)大跨徑混合梁混合梁斜
7、拉橋集鋼梁和混凝土梁各自優(yōu)點(diǎn)于一斜拉橋中跨合龍方案及關(guān)鍵技術(shù)進(jìn)行研究。該橋位體,滿足了大跨度、建設(shè)條件及經(jīng)濟(jì)性的要求,在千于湖北省黃石市,主橋采用橋跨布置為(3×67.5+米級(jí)乃至更大跨度斜拉橋方案中具有獨(dú)特的競(jìng)爭(zhēng)優(yōu)72.5+926十72.5+3×67.5)m的連續(xù)半飄浮雙塔勢(shì)。中跨合龍為斜拉橋建設(shè)過程的關(guān)鍵環(huán)節(jié)。混合梁斜拉橋。中跨采用鋼箱梁,邊跨采用混凝土收稿日期:2O1O一11—04作者簡(jiǎn)介:劉明虎(1971一),男,教授級(jí)高工,1993年畢業(yè)于重慶交通學(xué)院橋梁與結(jié)構(gòu)工程專業(yè),工學(xué)學(xué)-[2(1iuminghu@vip.sina.c
8、om)大跨徑混合梁斜拉橋合龍技術(shù)研究與實(shí)踐劉明虎,譚皓,徐國平,趙燦暉85目\lj}量褪瞽赦踴:母圖4頂推位移量與拉冢不平衡力的關(guān)系Fig.4DisplacementAmountofPushingandUnbalance