桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2015年
3期
7-12
,共6页
斜拉桥%公路铁路两用桥%桥塔基础%沉井%方案比选%结构设计
斜拉橋%公路鐵路兩用橋%橋塔基礎%沉井%方案比選%結構設計
사랍교%공로철로량용교%교탑기출%침정%방안비선%결구설계
cable-stayed bridge%rail-cum-road bridge%pylon foundation%open caisson%scheme comparison and selection%structural design
沪通长江大桥为4线铁路、6车道公路合建桥梁，主航道桥采用跨径布置为（142＋462＋1092＋462＋142） m的连续钢桁梁斜拉桥。该桥桥塔基础建设条件复杂，根据桥塔基础特性，从结构受力、经济性、施工便捷等方面对大直径钻孔桩基础和沉井基础方案（圆形沉井、矩形沉井）进行比选，最终推荐采用倒圆角的矩形沉井基础。矩形沉井下段采用钢沉井，上段采用混凝土沉井。28号、29号沉井总高分别为105 m、115 m。标准段井身平面尺寸为86．9 m ×58．7 m （四周倒圆角半径为7．45m），考虑施工便捷，井身竖向分节，标准节段高6m。沉井为平面框架结构，平面布置为24个12．8m×12．8m井孔，封底混凝土厚14m，为确保封底混凝土与井身结构传力，钢沉井底部设置抗剪剪力键。
滬通長江大橋為4線鐵路、6車道公路閤建橋樑，主航道橋採用跨徑佈置為（142＋462＋1092＋462＋142） m的連續鋼桁樑斜拉橋。該橋橋塔基礎建設條件複雜，根據橋塔基礎特性，從結構受力、經濟性、施工便捷等方麵對大直徑鑽孔樁基礎和沉井基礎方案（圓形沉井、矩形沉井）進行比選，最終推薦採用倒圓角的矩形沉井基礎。矩形沉井下段採用鋼沉井，上段採用混凝土沉井。28號、29號沉井總高分彆為105 m、115 m。標準段井身平麵呎吋為86．9 m ×58．7 m （四週倒圓角半徑為7．45m），攷慮施工便捷，井身豎嚮分節，標準節段高6m。沉井為平麵框架結構，平麵佈置為24箇12．8m×12．8m井孔，封底混凝土厚14m，為確保封底混凝土與井身結構傳力，鋼沉井底部設置抗剪剪力鍵。
호통장강대교위4선철로、6차도공로합건교량，주항도교채용과경포치위（142＋462＋1092＋462＋142） m적련속강항량사랍교。해교교탑기출건설조건복잡，근거교탑기출특성，종결구수력、경제성、시공편첩등방면대대직경찬공장기출화침정기출방안（원형침정、구형침정）진행비선，최종추천채용도원각적구형침정기출。구형침정하단채용강침정，상단채용혼응토침정。28호、29호침정총고분별위105 m、115 m。표준단정신평면척촌위86．9 m ×58．7 m （사주도원각반경위7．45m），고필시공편첩，정신수향분절，표준절단고6m。침정위평면광가결구，평면포치위24개12．8m×12．8m정공，봉저혼응토후14m，위학보봉저혼응토여정신결구전력，강침정저부설치항전전력건。
The Hutong Changjiang River Bridge is a rail‐cum‐road bridge to carry 4‐track rail‐ways and 6‐lane highways and the main ship channel bridge of the bridge is designed as a continu‐ous steel truss girder bridge with span arrangement (142+462+1 092+462+142) m .The con‐struction conditions of the pylon foundations for the bridge are complex .In the light of the charac‐teristics of the foundations ,the schemes of the large diameter bored pile foundations and open cais‐son foundations (circular and rectangular) are compared in the aspects of the structural force con‐ditions ,economy and construction convenience and it is finally recommended that the rectangular open caissons with rounded corners should be selected .For the rectangular open caisson ,the lower part of a caisson is the steel caisson w hile the upper part is the concrete one .T he total height of the caissons No .28 and No .29 is respectively 105 m and 115 m .The plan dimensions of the stand‐ard section of a caisson is 86 .9 m × 58 .7 m (the radii of the rounded corners around the caisson be‐ing 7 .45 m) .In consideration of the construction convenience ,the caisson is vertically divided into several lifts and the height of a standard lift is 6 m .The caisson is a plan frame structure in which 24 well holes ,each being 12 .8 m × 12 .8 m ,are arranged and the depth of the base sealing concrete of the caisson is 14 m .To ensure the force transfer between the base sealing concrete and caisson shaft ,the shear studs are arranged at the bottom of each steel caisson .
