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1、橋梁建設(shè)2015年第45卷第l期(總第230期)BridgeConstruction,Vo1.45,No.1,2015(TotallyNo.230)lO3文章編號:1003一1722(2015)01—0103—05廣西貴港西南大橋主橋設(shè)計李翠霞,張巨生(中鐵大橋勘測設(shè)計院集團有限公司,湖北武漢430056)摘要:廣西貴港市西南大橋主橋為(46+88+280+88+46)m雙塔雙索面預(yù)應(yīng)力混凝土邊主梁斜拉橋。主梁采用等高度帶懸臂的矩形混凝土邊主梁與“工”字形鋼橫梁相結(jié)合的形式,整幅橋面寬36.5ITI,設(shè)雙向2.0%橫坡。橋塔采用“魚”狀流線弧形框架鋼筋混凝土結(jié)構(gòu),塔柱
2、高102.5m,采用外側(cè)為“D”形圓弧段的箱形截面。橋塔設(shè)上、下橫梁,均采用預(yù)應(yīng)力混凝土單箱單室結(jié)構(gòu)。全橋共設(shè)136根斜拉索,斜拉索采用≠15.2mm鍍鋅鋼絞線索,空間雙索面扇形布置。橋塔墩采用分離式基礎(chǔ),上、下游分離式基礎(chǔ)中心距34.7m,其下各設(shè)9根2.5m鉆孔樁。承臺為正方形鋼筋混凝土結(jié)構(gòu)。4號墩頂面設(shè)一圓端形塔座。關(guān)鍵詞:斜拉橋;邊主梁;鋼橫梁;橋塔;鋼絞線斜拉索;分離式基礎(chǔ);結(jié)構(gòu)設(shè)計中圖分類號:U448.27;U442.5文獻標(biāo)志碼:ADesignofMainBridgeofXinanBridgeinGuigangCity,GuangxiLJCui-xia,
3、ZHANGJu—sheng(ChinaRailwayMajorBridgeReconnaissance&DesignGroupCo.,Ltd.,Wuhan430056,China)Abstract:ThemainbridgeoftheXinanBridgeinGuigangCity,Guangxiisaprestressedconcreteedgemaingirderscable—stayedbridgewithdoublepylons,doublecableplanesandwithspanarrangement(46+88+280+88+46)m.Themaing
4、irdersofthebridgeareofthestructuraltypecombiningtherectangularconcreteedgemaingirdershavingconstantdepthandcantileverswiththeI~shapestee1crossbeams.Thewidthofthewholebridgedeckis36.5mandthedeckisprovidedwithdual2.0transverseslopes.Apylonofthebridgeisthe“fish”一shapestreamlinedareframerei
5、nforcedconcretestructurethatis102.5minheightandtheoutersideofthepylonisofthe“D99_sh.a(chǎn)peroundarcboxsection.Theupperandlowercrossbeamsofthepylonarealltheprestressedconcretesingle—cellsingle—boxstructures.Therearetotally136staycablesarrangedforthewholebridge.Thestaycablesarethe15.2mmgalvan
6、izedsteelwirestrandcablesandarearrangedinfanshapeandspatialdoublecableplanes.Thepylonpierissupportedonthesep—aratedfoundations.Thecenter—to—centerdistanceofthefoundationsontheupstreamanddown—streamsidesis34.7mandineachfoundation,9nos.of2.5mboredpilesarearranged.Thepilecapsofthefoundatio
7、nsarethesquarereinforcedconcretestructuresandatthetopofPierNo.4,around-endpylonbaseisarranged.Keywords:cable—stayedbridge;edgemaingirder;steelcrossbeam;pylon;steelwirestrandstaycable;separatedfoundations;structuraldesign1工程概況橫跨郁江。項目起點位于迎賓大道,終點位于江南廣西貴港市西南大橋位于貴港市中心城區(qū)東西大道,線路全長約452