桥梁建设
橋樑建設
교량건설
BRIDGE CONSTRUCTION
2015年
4期
7-12
,共6页
悬索桥%桩基础%钢套箱围堰%河床防护%承台%桥梁施工
懸索橋%樁基礎%鋼套箱圍堰%河床防護%承檯%橋樑施工
현색교%장기출%강투상위언%하상방호%승태%교량시공
suspension bridge%pile foundation%steel boxed cofferdam%riverbed scouring pro-tection%pile cap%bridge construction
武汉鹦鹉洲长江大桥主桥为（200＋850＋850＋200） m三塔钢－混结合梁悬索桥，该桥中塔（2号）墩基础采用39根直径2．8m钻孔灌注桩，承台为圆端矩形，长70m、宽34m、高6．5 m，埋置于河床覆盖层中。中塔墩基础采用双壁钢套箱围堰和“先围堰、后平台”的总体施工方案。在围堰浮运定位前，先在河床面铺设软体排进行主动防护，以减少基础施工对河床的冲刷；底节围堰在岸上制造，采用气囊法下河，先转向后直线下水，利用“前后定位船＋重锚”系统定位，通过向井壁注水快速着床，围堰吸泥下沉到位后，搭建施工平台进行钻孔桩施工；最后进行围堰清基、封底，分2层按大体积混凝土工艺进行承台施工。
武漢鸚鵡洲長江大橋主橋為（200＋850＋850＋200） m三塔鋼－混結閤樑懸索橋，該橋中塔（2號）墩基礎採用39根直徑2．8m鑽孔灌註樁，承檯為圓耑矩形，長70m、寬34m、高6．5 m，埋置于河床覆蓋層中。中塔墩基礎採用雙壁鋼套箱圍堰和“先圍堰、後平檯”的總體施工方案。在圍堰浮運定位前，先在河床麵鋪設軟體排進行主動防護，以減少基礎施工對河床的遲刷；底節圍堰在岸上製造，採用氣囊法下河，先轉嚮後直線下水，利用“前後定位船＋重錨”繫統定位，通過嚮井壁註水快速著床，圍堰吸泥下沉到位後，搭建施工平檯進行鑽孔樁施工；最後進行圍堰清基、封底，分2層按大體積混凝土工藝進行承檯施工。
무한앵무주장강대교주교위（200＋850＋850＋200） m삼탑강－혼결합량현색교，해교중탑（2호）돈기출채용39근직경2．8m찬공관주장，승태위원단구형，장70m、관34m、고6．5 m，매치우하상복개층중。중탑돈기출채용쌍벽강투상위언화“선위언、후평태”적총체시공방안。재위언부운정위전，선재하상면포설연체배진행주동방호，이감소기출시공대하상적충쇄；저절위언재안상제조，채용기낭법하하，선전향후직선하수，이용“전후정위선＋중묘”계통정위，통과향정벽주수쾌속착상，위언흡니하침도위후，탑건시공평태진행찬공장시공；최후진행위언청기、봉저，분2층안대체적혼응토공예진행승태시공。
The main bridge of Yingwuzhou Changjiang River Bridge in Wuhan is a three‐tower steel and concrete composite girder suspension bridge with span arrangement (200+ 850+850+200) m .The foundation of the intermediate tower pier (Pier No .2) of the bridge is composed of 39 nos .of diameter 2 .8 m bored piles .The pile cap is in the round‐end rectangular shape that is 70 m long ,34 m wide and 6 .5 m high and the pile cap is embedded in the riverbed overburden .The foundation was constructed by the general scheme of double‐wall steel boxed cofferdam and of con‐structing the cofferdam first and the working platform late .Before the cofferdam was floated and positioned ,the soft mattress was laid out on the riverbed to serve as the active protection in order to lessen the scouring of the riverbed due to the construction of the foundation .The first lift of the cofferdam was manufactured on bank and was launched to the river by the air bag method .The lift of the cofferdam was turned first ,then launched to the river in a straight line and positioned by the system of "front and rear positioning barges+heavy anchors".By pumping water into the walls of the cofferdam ,the cofferdam was rapidly landed onto the riverbed .After the cofferdam was sunk down in place to the designed elevation by dredging ,the working platform was set up and the con‐struction of the bored piles started .The base of the cofferdam was cleared off ,sealed by concreting and the pile cap was finally constructed in two layers according to the workmanship of massive concrete .
