超大哑铃形底节双壁钢围堰横移下水技术  

Techniques of Transverse Shifting and Launching of Very Large Bottom Lift of a Dumbbell-Shape Double-Wall Steel Cofferdam

作　　者：陶建山 

机构地区：[1]中铁大桥局武汉青山长江大桥项目部,湖北武汉430345

出　　处：《桥梁建设》2016年第3期103-108,共6页Bridge Construction

摘　　要：武汉青山长江公路大桥主桥为(350+938+350)m双塔双索面斜拉桥,其20号桥塔墩基础为60根直径2.5m的钻孔桩,采用半自浮式哑铃形双壁钢围堰施工。哑铃形双壁钢围堰长达103.8m、圆筒直径43.4m、总高37m、壁厚2m,钢围堰竖向分为3节(底节、中节和顶节),其底节钢围堰高18.2m。底节钢围堰在船厂制造,并在船厂的水平船台上拼装,焊接成整体;利用44台轨道台车将底节钢围堰从拼装处移至斜船架换架区,并利用轨道台车的千斤顶同步顶升,使底节钢围堰脱离钢支垛,进行底节钢围堰水平横移;在横向梳式船台换架后,利用13台斜船架托运底节钢围堰,底节钢围堰沿斜坡滑道同步下滑,平稳下水后自浮。The main bridge of the Qingshan Changjiang River Highway Bridge in Wuhan is a cable-stayed bridge with double pylons,double cable planes and with span arrangement（350＋938＋350）m.The foundation for the pylon pier No.20 of the bridge is comprised of 60 nos.of2.5m bored piles and was constructed,using the semi-floating dumbbell-shape double-wall steel cofferdam.The length of the cofferdam is 103.8m,the diameter of the part of a cylinder is 43.4m,the total height of the cofferdam is 37 mand the wall thickness is 2m.Vertically,the cofferdam is divided into 3parts of the bottom lift,middle lift and top lift,of which the height of the bottom lift is 18.2m.The bottom lift of the cofferdam was manufactured in the shipyard and was assembled and welded into an integrity on the horizontal building berth also there.By the aid of 44 sets of the rail trolleys,the lift of the cofferdam was shifted from its assembling place to the support changing area of the wedge type launching cradles and was synchronously jacked up apart from its existing steel stands by the jacks on the rail trolleys to start the horizontal transverse shifting.After the supports of the lift of the cofferdam were changed at the comb type building berth,the lift of the cofferdam was then carried by 13 sets of the wedge type launching cradles,was synchronously slid down along the slope slipway and was finally steadily launched to the river and floated there.

关 键 词：斜拉桥 桩基础 哑铃形承台 双壁钢围堰 整体横移 横向下水 施工技术 桥梁施工 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U445.556[交通运输工程—道路与铁道工程]