山區(qū)大跨度懸索橋鋼桁梁施工技術(shù)

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1、橋梁建設(shè)2012年第卷第3期(總第213期)BridgeConstruction，Vo1．42，No．3，2012(TotallyNo．213)107文章編號(hào)：1003—4722(2012)03—0107—07山區(qū)大跨度懸索橋鋼桁梁施工技術(shù)紀(jì)為詳，陶路?！?1．貴州高速公路開發(fā)總公司，貴州貴陽550001；2．中鐵大橋局集團(tuán)橋科院有限公司湖北武漢430034；3．橋梁結(jié)構(gòu)安全與健康湖北省重點(diǎn)實(shí)驗(yàn)室，湖北武漢430034)摘要：為解決山區(qū)大跨度懸索橋鋼桁梁架設(shè)施工受地形條件限制的問題，以壩陵河大橋?yàn)楸尘埃芯繕蛎娴鯔C(jī)懸

2、臂架設(shè)法施工中不同區(qū)域的鋼桁梁安裝、鋼桁梁合龍及鋼桁梁提升等施工技術(shù)。首、次節(jié)梁段采用整體吊裝施工，標(biāo)準(zhǔn)梁段及臨時(shí)鉸處梁段采用桁片吊裝架設(shè)，并在臨時(shí)鉸處設(shè)置支撐系統(tǒng)(與鋼桁梁鉸接)；臨時(shí)鉸采用自然合龍，跨中鋼桁梁合龍前調(diào)整豎向高差及上、下弦合龍口縱向相對(duì)偏差(暫不安裝合龍口前端永久吊索)，合龍時(shí)在橋塔處牽引鋼桁梁調(diào)整縱向偏差；單點(diǎn)提升力大于2400kN的梁段采用兩點(diǎn)提升，其余梁段均采用單點(diǎn)提升。關(guān)鍵詞：懸索橋；鋼桁梁；橋面吊機(jī)；懸臂拼裝架橋；施工技術(shù)；橋梁施工中圖分類號(hào)：U448．25；U445．4文獻(xiàn)標(biāo)志碼：ACo

3、nstructionTechniquesforSteelTrussGirderofLongSpanSuspensionBridgeinMountainousRegionjIWei—xiang．TAOLu'。(1．GuizhouExpresswayDevelopmentCorporation，Guiyang550001，China；2．BridgeScienceResearchInstituteLtd．，ChinaRailwayMajorBridgeEngineeringGroup，Wuhan430034，China；

4、3．KeyLaboratoryofBridgeStructureSafetyandHealthofHubeiProvince，Wuhan430034，China)Abstract：Tocopewiththeproblemthattheerectionofthesteeltrussgirderoflongspansuspensionbridgeinmountainousregionisrestrictedbythetopographicconditionsintheregion，theBalingRiverBridge

5、istakenasanexample，theconstructibntechniquesfortheerection，clo—sureandliftingofdifferentareasofthetrussgirder，usingthedeckcranecantilevererectionmethodarestudied．Accordingtothestudy，thefirstandsecondaryblocksofthegirdershouldbeintegrallyliftedandassembled，thety

6、picalblocksandtheblockatthetemporaryhingeshouldbeliftedandassembledineachtrussunitandthesupportsystem(hingedlyconnectedwiththegirder)shouldbeaccordinglyarrangedatthetemporaryhinge．Thetemporaryhingeshouldbeclosedinanaturalwayandbeforetheclosureofthemidspansteelt

7、russgirder。theverticalheightdifferencesandthelongitudinalrelativedeviationdifferencesatthegapsoftheupperandlowerchordsofthegirder(thefrontendpermanentsuspendersaretemporarilynotassembled)shouldbeadjusted．Atthetimeoftheclosure，thegirderistobehauledatthetowertoad

8、justthelongi—tudinaldeviationdifferences．Fortheblockswiththesingle—pointliftingforcegreaterthan2400kN，thetwo—pointliftingshouldbeappliedwhilefortherestoftheblocks，thesingle—