兴联路大通道主航道桥主墩双壁钢围堰施工技术  

Construction Techniques for Double-Walled Steel Box Cofferdamsof Pylon Piers of Main Navigation Channel Bridge Carrying aSection of Xinglian Road Corridor over Xiangjiang River

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)

机构地区：[1]中交一公局第六工程有限公司,天津300451

出　　处：《桥梁建设》2024年第3期142-148,共7页Bridge Construction

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.

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 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U445.4[交通运输工程—道路与铁道工程]