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宜昌香溪河大桥4号桥塔墩钢围堰封底技术 预览 被引量:1

Techniques of Base Sealing for Steel Cofferdam of Pylon Pier No.4 of Yichang Xiangxi River Bridge
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摘要 宜昌香溪河大桥主桥为(2X48+78+470+78+2X48)m的双塔双索面斜拉桥,其4号桥塔墩采用18根妇.0m钻孔桩基础,基础采用先钻孔平台、后圆形双壁钢套箱围堰(内径30.2m,外径33.2m)的方案施工。封底施工是钢围堰施工的关键工序,为了保证抽水后围堰能够承受水头差产生的巨大压力,必须从封底混凝土厚度设计及灌注施工方面保证封底质量。采用MIDASCivil软件建立钢围堰结构整体有限元模型,通过封底混凝土受力计算,确定采用厚度为5.0m的C30水下混凝土封底。在4号桥塔墩钢围堰吸泥下沉至设计高程后,运用水下找平技术将围堰内河床标高找平至+139.0m,采用水下导管法、按照“由外向内、由中心向四周”的顺序灌注混凝土。围堰抽水期间的应力及变形监测结果表明,封底结构安全且无渗水现象。 The main bridge of Yichang Xiangxi River Bridge is a cable-stayed bridge with double pylons,double cable planes and with span arrangement(2X48+78+470+78+2X48)m.The foundation for the pylon pier No.4 of the bridge is the one comprised of 18 nos.of the^3.0 m bored piles and in the construction of the foundation,using the circular double-wall steel boxed cofferdam(the internal diameter of the cofferdam being 30.2 m and the external diameter being 33.2 m),the scheme of building up the boring platform before constructing the cofferdam was adopted.The base sealing for the cofferdam was the critical working procedure in the construction and to ensure that the cofferdam could bear the tremendous pressure caused by the water head difference after the water in the cofferdam was pumped out,the quality of the base sealing must be guaranteed in the two aspects of the thickness design and casting of the base sealing concrete.The software MIDAS Civil was used to establish the finite element model for the overall cofferdam structure and by means of calculating the forces of the concrete,it was determined that the C30tremie concrete of 5.0 m thickness should be used.After the cofferdam was sunk to the designed elevation by the air lifting,the underwater leveling technique was then used to level the riverbed part in the cofferdam to the elevation of+139.0 m and the concrete was cast in the sequences from the outside to the inside and from the center to the circumference of the cofferdam,using the tremie ducts.The monitoring results of the stresses and deformation of the cofferdam during the pumping-out of the water in the cofferdam showed that the base sealing of the structure was safe and there was no problem of the water seepage.
作者 许鑫 王同民 XU Xin[1];WANG Tong-min[1]([1]The 7th Engineering Co.,Ltd.,China Railway Major Bridge Engineering Group,Wuhan 430056,China)
出处 《桥梁建设》 CSCD 北大核心 2018年第2期105-110,共6页 Bridge Construction
关键词 斜拉桥 桩基础 钢围堰 封底混凝土 有限元法 混凝土浇筑 桥梁施工 cable-stayed bridge pile foundation steel cofferdam base sealing concrete finite element method concrete casting bridge construction
作者简介 许鑫,1985—,男,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,E-mail:962047058@qq.com;王同民,1974—,男,高级工程师,1994年毕业于湖北省交通学校公路与桥梁工程专业,1998年毕业于中南大学铁道工程(桥梁)专业,2008年毕业于湖北工业大学工程管理专业。研究方向:桥梁施工,E-mail:ztmbec@vip.qq.com
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