
2014年9月上第43卷第17期
DOI:10.7672/sgjs2014170057
施工技术
CONSTRUCTION TECHNOLOGY
东茗溪大桥钢拱塔竖向转体施工技术
郭劲1,2,陈少林1,2,罗自立1,2,饶华容1,2,徐元孝3(1.中交第二航务工程局有限公司技术中心,湖北武汉430040; 2.长大桥梁建设施工技术交通行业重点实验室,湖北武汉430040:
3.中交二航局第二工程有限公司,重庆400016)
[摘要】结合东茗溪大桥工程实例,介绍了该桥钢拱斜塔的施工难点,参考国内外已有斜塔施工经验,从成本、工期、技术特点等方面对吊装方案和3个竖转方案做了详细的阐述和比较。重点介绍了该桥桥塔实施方案,属于目
【关键词]桥梁工程;钢拱塔:安装:竖向转体:施工技术
[中图分类号】U448
【文献标识码]】A
[文章编号]1002-8498(2014)17-0057-04
Vertical Swivel Construction Technology of Steel Arch
TowerforDongshaoxiBridge
Guo Jin',2,Chen Shaolin',2,Luo Zili',2,Rao Huarong'2,XuYuanxiao
(1. Technology Center of CCCC Second Harbour Engineering Co. , Lid. , Wuhan, Hubei 430040, China:
2. Key Lab. for Large-span Bridge Construction Technology, Wuhan, Hubei430040, China;
3. The 2nd Engineering Co. , Lid. of CCCC Second Harbour Engineering Co. , Lid. , Chongqing 400016, China) Abstract : Based on the construction of Dongshaoxi Bridge, the authors introduce the difficulties during the inclined tower erection, and contrast hoisting method with three other vertical swivel construction methods in the aspects of cost, schedule, technical characteristics and so on. The authors focus on the inclined tower construction method, the inclined tower is vertically swiveled by the technique of synchronous hydraulic tensioning and assembly in the plane position, which is the first construction example in our country.
Key words: bridges ; steel arch towers; installation; vertical swivel method; construction
1工程概况
东苕溪大桥主桥为跨径布置75m+228m+75m 的斜拉-悬索协作体系,如图1所示。两侧拱形斜塔关于跨中对称,均向边跨倾斜20°,拱塔重1494.2t,垂直高度67.163m,主拱采用箱形截面,拱跨径为
38.86m,矢高为71.474m,拱轴线为悬链线。
2桥塔施工难点 2.1主塔制造难点
1)主塔拱轴线为悬链线,主塔截面为接近90° 夹角的变宽梯形断面,截面高度沿塔轴线方向线性变化,壁板为三维线形,制造线形控制难度大。
2)由于装配间隙和焊接收缩的累计,拱塔钢错
【作者简介]郭劲,高级工程师,E-mail529038555@qq-com【通讯作者]陈少林,助理工程师,E-mail:87354032@qq-com[收稿日期】2013-12-25
图1东苕溪大桥效果图
Fig.1 Effect of Dongshaoxi Bridge
箱精确定位难度大。
2.2主塔安装线形控制难点
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钢拱塔安装的线形是全桥质量保证重点之一关系到全桥的受力状态和使用寿命。该桥钢拱塔轴线为悬链线,钢拱塔平面向边跨倾斜20°。在施工过程中,拱塔的线形实际上为空间线形,拱塔的
线形控制难度大。 2.3主塔焊接难点