宜昌香溪河大桥4号桥塔墩钢围堰封底技术
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摘要
宜昌香溪河大桥主桥为(2×48+78+470+78+2×48)m的双塔双索面斜拉桥,其4号桥塔墩采用18根3.0m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MIDAS Civil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(2×48+78+470+78+2×48)m.The foundation for the pylon pier No.4 of the bridge is the one comprised of 18 nos.of the3.0 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 mand the external diameter being33.2 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 C30 tremie concrete of 5.0 mthickness 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.
The main bridge of Yichang Xiangxi River Bridge is a cable-stayed bridge with double pylons,double cable planes and with span arrangement(2×48+78+470+78+2×48)m.The foundation for the pylon pier No.4 of the bridge is the one comprised of 18 nos.of the3.0 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 mand the external diameter being33.2 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 C30 tremie concrete of 5.0 mthickness 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.
引文
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[6]徐小祥.深水裸露坡岩大型高低刃脚双壁钢围堰设计与施工[J].铁道建筑,2016(2):47-51.(XU Xiao-xiang.Design and Construction of Large Double-Wall Steel Cofferdam with Unequal Height Cutting Edges Used at Bare Rock Slope in Deep Water[J].Railway Engineering,2016(2):47-51.in Chinese)
[7]何树凯.跨江大桥水中基础施工方案设计[J].世界桥梁,2014,42(2):52-56.(HE Shu-kai.Design of Construction Schemes for InWater Foundations of River-Crossing Bridges[J].World Bridges,2014,42(2):52-56.in Chinese)
[8]曾炜,邓华明.沪通长江大桥天生港专用航道桥3号主墩钢围堰施工技术[J].桥梁建设,2015,45(6):101-105.(ZENG Wei,DENG Hua-ming.Construction Techniques of Steel Cofferdam for Main Pier No.3of Tiansheng Port Special Ship Channel Bridge of Hutong Changjiang River Bridge[J].Bridge Construction,2015,45(6):101-105.in Chinese)
[9]刘博,蒋本俊,雷美清.武汉二七长江大桥钢板桩围堰水下封底技术[J].土工基础,2010,24(5):14-16.(LIU Bo,JIANG Ben-jun,LEI Mei-qing.Technology of Underwater Base Sealing for Steel Sheet Pile Cofferdam of Erqi Yangtze River Bridge in Wuhan[J].Soil Engineering and Foundation,2010,24(5):14-16.in Chinese)
[10]付小莲,徐芸.郁江特大桥深水基础钢围堰水下封底施工技术[J].世界桥梁,2014,42(3):30-33.(FU Xiao-lian,XU Yun.Construction Techniques for Underwater Base Sealing of Steel Cofferdams for Deepwater Foundations of Yujiang River Bridge[J].World Bridges,2014,42(3):30-33.in Chinese)
[11]郝胜利,李涛,向宁,等.南京长江第四大桥北锚碇沉井大体积混凝土封底施工技术[J].公路,2010(6):35-39.(HAO Sheng-li,LI Tao,XIANG Ning,et al.Construction Techniques of Mass Concrete Base Sealing for Open Caisson of North Anchorage of Fourth Nanjing Changjiang River Bridge[J].Highway,2010(6):35-39.in Chinese)
[12]刘成钢,茹启江,陈琳,等.海域深水区高桩承台钢吊箱围堰施工技术[J].建筑技术,2016,47(6):533-536.(LIU Cheng-gang,RU Qi-jiang,CHEN Lin,et al.Construction Technology of Steel Boxed Cofferdam for Elevated Pile Cap in Deepwater Area of Sea[J].Architecture Technology,2016,47(6):533-536.in Chinese)
[13]郭永斌.钢围堰深水大体积砼封底施工技术[J].国防交通工程与技术,2011,9(3):57-59.(GUO Yong-bin.Construction Techniques for Underwater Mass Concrete Base Sealing of Steel Cofferdams[J].Traffic Engineering and Technology for National Defence,2011,9(3):57-59.in Chinese)
[2]李陆平,尤继勤,王吉连.蔡家湾汉江特大桥深水基础钢套箱围堰施工技术[J].桥梁建设,2010(1):59-62.(LI Lu-ping,YOU Ji-qin,WANG Ji-lian.Construction Techniques of Steel Boxed Cofferdams for Deep Water Foundations of Caijiawan Hanjiang River Bridge[J].Bridge Construction,2010(1):59-62.in Chinese)
[3]闫志刚.沪通长江大桥天生港专用航道桥3号主墩钢围堰封底技术[J].桥梁建设,2015,45(6):89-94.(YAN Zhi-gang.Techniques of Steel Cofferdam Base Sealing for Main Pier No.3of Tiansheng Port Special Ship Channel Bridge of Hutong Changjiang River Bridge[J].Bridge Construction,2015,45(6):89-94.in Chinese)
[4]肖向荣,江俊波.高低刃脚不规则钢围堰施工工艺及受力研究[J].中外公路,2016(4):231-234.(XIAO Xiang-rong,JIANG Jun-bo.Study of Construction Technology and Force Conditions of Irregular Steel Cofferdam with Unequal Height Cutting Edges[J].Journal of China&Foreign Highway,2016(4):231-234.in Chinese)
[5]魏胜新,江俊波.深水无覆盖层超倾斜岩面河床桥塔基础施工技术[J].世界桥梁,2013,41(6):11-15.(WEI Sheng-xin,JIANG Jun-bo.Construction Techniques for Pylon Foundation in Riverbed with Very Inclined Rock Surface and Without Overburden in Deepwater[J].World Bridges,2013,41(6):11-15.in Chinese)
[6]徐小祥.深水裸露坡岩大型高低刃脚双壁钢围堰设计与施工[J].铁道建筑,2016(2):47-51.(XU Xiao-xiang.Design and Construction of Large Double-Wall Steel Cofferdam with Unequal Height Cutting Edges Used at Bare Rock Slope in Deep Water[J].Railway Engineering,2016(2):47-51.in Chinese)
[7]何树凯.跨江大桥水中基础施工方案设计[J].世界桥梁,2014,42(2):52-56.(HE Shu-kai.Design of Construction Schemes for InWater Foundations of River-Crossing Bridges[J].World Bridges,2014,42(2):52-56.in Chinese)
[8]曾炜,邓华明.沪通长江大桥天生港专用航道桥3号主墩钢围堰施工技术[J].桥梁建设,2015,45(6):101-105.(ZENG Wei,DENG Hua-ming.Construction Techniques of Steel Cofferdam for Main Pier No.3of Tiansheng Port Special Ship Channel Bridge of Hutong Changjiang River Bridge[J].Bridge Construction,2015,45(6):101-105.in Chinese)
[9]刘博,蒋本俊,雷美清.武汉二七长江大桥钢板桩围堰水下封底技术[J].土工基础,2010,24(5):14-16.(LIU Bo,JIANG Ben-jun,LEI Mei-qing.Technology of Underwater Base Sealing for Steel Sheet Pile Cofferdam of Erqi Yangtze River Bridge in Wuhan[J].Soil Engineering and Foundation,2010,24(5):14-16.in Chinese)
[10]付小莲,徐芸.郁江特大桥深水基础钢围堰水下封底施工技术[J].世界桥梁,2014,42(3):30-33.(FU Xiao-lian,XU Yun.Construction Techniques for Underwater Base Sealing of Steel Cofferdams for Deepwater Foundations of Yujiang River Bridge[J].World Bridges,2014,42(3):30-33.in Chinese)
[11]郝胜利,李涛,向宁,等.南京长江第四大桥北锚碇沉井大体积混凝土封底施工技术[J].公路,2010(6):35-39.(HAO Sheng-li,LI Tao,XIANG Ning,et al.Construction Techniques of Mass Concrete Base Sealing for Open Caisson of North Anchorage of Fourth Nanjing Changjiang River Bridge[J].Highway,2010(6):35-39.in Chinese)
[12]刘成钢,茹启江,陈琳,等.海域深水区高桩承台钢吊箱围堰施工技术[J].建筑技术,2016,47(6):533-536.(LIU Cheng-gang,RU Qi-jiang,CHEN Lin,et al.Construction Technology of Steel Boxed Cofferdam for Elevated Pile Cap in Deepwater Area of Sea[J].Architecture Technology,2016,47(6):533-536.in Chinese)
[13]郭永斌.钢围堰深水大体积砼封底施工技术[J].国防交通工程与技术,2011,9(3):57-59.(GUO Yong-bin.Construction Techniques for Underwater Mass Concrete Base Sealing of Steel Cofferdams[J].Traffic Engineering and Technology for National Defence,2011,9(3):57-59.in Chinese)
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