摘要
兴联路大通道主航道桥为(165+380+165) m双塔双索面钢-混组合梁斜拉桥,主墩采用哑铃形承台,承台尺寸为62.5 m(横向)×22.6 m(纵向)×7.0 m(高),中间系梁宽11.4 m。其中,51号主墩承台顶、底高程分别为+18.0 m和+11.0 m,河床平均高程为+19.0 m,常水位为+29.8 m。主墩承台采用双壁钢套箱围堰方案施工,51号主墩围堰长66.3 m、宽26.4 m、高24.0 m,壁厚1.8 m,内设3层内支撑,封底混凝土厚3.0 m,围堰抽水水头高度约18.8 m。钢围堰加工前,采用模块化思路,将钢围堰整体竖向分3节、横向分20块;底节钢围堰带钢护筒群整体加工制作,利用2艘800 t浮吊整体吊装下水,利用3艘拖轮将钢围堰带钢护筒群整体浮运至桥位,依次进行水上钢围堰和钢护筒浮态接高;设置水平定位系统,钢围堰精确定位下沉着床,浇筑封底混凝土及隔舱混凝土。该桥承台施工中钢围堰未发生漏水情况,整体质量良好。
The main navigation channel bridge carrying a section of Xinglian Road Corridor over the Xiangjiang River is a hybrid girder cable-stayed bridge with a main span of 380 m and two side spans of 165 m.The stay cables are arranged in double cable planes.The two pylon piers are supported on dumb-bell shaped pile caps that measure 62.5 m by 22.6 m,7.0 m in height,the tie between the two bells is 11.4 m wide.The top and bottom of the pile cap of main pier No.51 are measured at elevations of+18.0 m and+11.0 m,respectively,the average elevation of riverbed is at+19.0 m and the average water level is at+29.8 m.The pile caps were constructed with the aid of double-walled steel box cofferdams,and the cofferdam of the pylon pier No.5 measures 66.3 m by 26.4 m,24 m in height,featuring the 1.8 m-thick walls,three layers of inner supports and 3.0 m-thick tremie seal.The steel cofferdam suitable for 18.8 m head of water was divided vertically into three lifts and transversely into 20 pieces to achieve a modularized construction,the base lift was manufactured integrally with the steel casings,hoisted by two barge-mounted cranes each with a lifting capacity of 800 t,and delivered to the bridge site by three tugboats.Afterwards,the steel cofferdam and steel casings were elongated in water.Aided by the horizontal positioning system,the steel cofferdam was precisely positioned and landed onto the riverbed,and the pouring of tremie seal and in-fill concrete for the cofferdam cells ensued.No leakage was observed during the construction,indicating the sound quality of the steel cofferdams.
作者
张庆伟
王成伟
王俊野
ZHANG Qingwei;WANG Chengwei;WANG Junye(The Sixth Engineering Co.,Ltd.,China First Highway Engineering Co.,Ltd.,Tianjin 300451,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2024年第3期142-148,共7页
Bridge Construction
关键词
斜拉桥
双壁钢套箱围堰
模块化
钢围堰带钢护筒群加工
整体吊装
浮态接高
施工技术
cable-stayed bridge
double-walled steel box cofferdam
modularization
manufacture of steel cofferdam with steel casings
integral hoisting
in-water elongation
construction technique
作者简介
张庆伟,1985—,男,高级工程师,2006年毕业于长春工程学院道路与桥梁工程专业,工学学士。研究方向:桥梁施工技术与管理,E-mail:153593235@qq.com;王成伟,1985—,男,正高级工程师,2008年毕业于西南交通大学土木工程专业,工学学士。研究方向:桥梁施工技术与管理,E-mail:397235528@qq.com;王俊野,1991—,男,工程师,2014年毕业于武汉理工大学道路桥梁与渡河工程专业,工学学士。研究方向:桥梁施工技术与管理,E-mail:187147576@qq.com。
