平潭海峡公铁两用大桥深水区围堰施工关键技术
|
摘要
平潭海峡公铁两用大桥深水区非通航孔引桥为跨径80(88)m的简支钢桁梁桥,采用钻孔桩基础,承台基础采用钢吊箱围堰施工。钢吊箱围堰尺寸为32.0m×19.8m×20.4m,承台顶面以下围堰为双壁结构,壁厚1.0m,内设2层内支撑,封底混凝土厚3.5m。考虑到平潭海峡浪高、风大、流急、潮差大等影响因素,围堰完成封底、抽水后,安装抗浮牛腿,以满足围堰的整体抗浮、抗沉要求;围堰在工厂内分块加工、拼装,侧板与底板间采用螺栓连接,以实现围堰的快速安装和倒用;在围堰内设置了3层限位装置,以解决波浪力和水流力引起的围堰下放精度难以控制的问题;在围堰侧板与底龙骨间采用螺栓连接,以满足围堰的防浪、防渗要求。
The non-navigable span approach bridge of the Pingtan Strait Rail-cum-Road Bridge over the deep water is a simply supported steel truss bridge with a span of 80(88)m.The piers of the bridge are made of bored pile foundation which is constructed with steel boxed cofferdam.The structure of the steel boxed cofferdam has the dimensions of 32.0 m×19.8 m×20.4 m.The cofferdam below the top surface of the cap has a double-wall structure with a wall thickness of 1.0 m,two layers of internal support,and a bottom concrete thickness of 3.5 m.The influences of wave height,strong wind,flow hurry and tidal range in Pingtan Strait are taken into account,therefore,after the cofferdam is sealed and pumped,an anti-floating bracket is installed to meet the requirements of overall anti-floating and anti-sinking of the cofferdam.The cofferdam is manufactured and assembled in pieces in a factory.Bolts are used to connect the side plate and the bottom plate to realize the quick installation and reverse use of the cofferdam.At the same time,3-layer guiding and limiting devices are also arranged to solve the problem of the low accuracy caused by wave force and flow force when the cofferdam is lowered into the water.Bolt connection is adopted between the side plate and bottom keel of cofferdam to meet the requirements of wave and seepage prevention.
The non-navigable span approach bridge of the Pingtan Strait Rail-cum-Road Bridge over the deep water is a simply supported steel truss bridge with a span of 80(88)m.The piers of the bridge are made of bored pile foundation which is constructed with steel boxed cofferdam.The structure of the steel boxed cofferdam has the dimensions of 32.0 m×19.8 m×20.4 m.The cofferdam below the top surface of the cap has a double-wall structure with a wall thickness of 1.0 m,two layers of internal support,and a bottom concrete thickness of 3.5 m.The influences of wave height,strong wind,flow hurry and tidal range in Pingtan Strait are taken into account,therefore,after the cofferdam is sealed and pumped,an anti-floating bracket is installed to meet the requirements of overall anti-floating and anti-sinking of the cofferdam.The cofferdam is manufactured and assembled in pieces in a factory.Bolts are used to connect the side plate and the bottom plate to realize the quick installation and reverse use of the cofferdam.At the same time,3-layer guiding and limiting devices are also arranged to solve the problem of the low accuracy caused by wave force and flow force when the cofferdam is lowered into the water.Bolt connection is adopted between the side plate and bottom keel of cofferdam to meet the requirements of wave and seepage prevention.
引文
[1]马晓东.平潭海峡公铁两用大桥总体施工方案[J].桥梁建设,2017,47(2):1-6.(MA Xiao-dong.General Construction Scheme of Pingtan Straits Rail-cum-Road Bridge[J].Bridge Construction,2017,47(2):1-6.in Chinese)
[2]国家海洋局第三海洋研究所.平潭上岛铁路海坛海峡大桥工程可行性研究水文分析计算专题报告[R].厦门:2013.(Third Institute of Oceanography,State Oceanic Administration.Feasibility Study Report on Hydrological Analysis and Calculation of Pingtan Straits Rail-cumRoad Bridge[R].Xiamen:2013.in Chinese)
[3]王东辉.平潭海峡公铁两用大桥非通航孔引桥围堰设计与施工[J].桥梁建设,2016,46(3):1-5.(WANG Dong-hui.Design and Construction of Cofferdam for Non-Navigable Span Approach Bridge of Pingtan Straits Rail-cum-Road Bridge[J].Bridge Construction,2016,46(3):1-5.in Chinese)
[4]王东辉.平潭海峡公铁两用大桥航道桥基础设计与施工创新技术[J].铁道标准设计,2017,61(9):68-75.(WANG Dong-hui.Innovation Technology in Channel Bridge Foundation Design and Construction of Pingtan Strait Rail-cum-Road Bridge[J].Railway Standard Design,2017,61(9):68-75.in Chinese)
[5]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 Application of Steel Boxed Cofferdam on High-Rise Pile Cap in Deep Ocean Area[J].Architecture Technology,2016,47(6):533-536.in Chinese)
[6]金红岩.武汉青山长江公路大桥钢套箱围堰下沉施工技术[J].桥梁建设,2018,48(2):7-12.(JIN Hong-yan.Construction Techniques for Sinking of Steel Boxed Cofferdam of Qingshan Changjiang River Highway Bridge in Wuhan[J].Bridge Construction,2018,48(2):7-12.in Chinese)
[7]陈翔,梅新咏.平潭海峡公铁两用大桥主航道斜拉桥深水基础设计[J].桥梁建设,2016,46(3):86-91.(CHEN Xiang,MEI Xin-yong.Design of Deepwater Foundations of Main Ship Channel Cable-Stayed Bridge of Pingtan Straits Rail-cum-Road Bridge[J].Bridge Construction,2016,46(3):86-91.in Chinese)
[8]陈山亭.港珠澳大桥浅水区非通航孔桥下部结构施工关键技术[J].桥梁建设,2016,46(1):6-11.(CHEN Shan-ting.Key Techniques for Construction of Substructure of Non-Navigable Span Bridge of Hong Kong-Zhuhai-Macao Bridge over Shallow Water Area[J].Bridge Construction,2016,46(1):6-11.in Chinese)
[9]黄剑锋.港珠澳大桥浅水区非通航孔桥围堰设计[J].桥梁建设,2015,45(4):88-93.(HUANG Jian-feng.Design of Cofferdam for NonNavigable Span Bridge of Hong Kong-Zhuhai-Macao Bridge over Shallow Water Area[J].Bridge Construction,2015,45(4):88-93.in Chinese)
[10]田睿,何荣坚.港珠澳大桥江海直达船航道桥主墩承台施工[J].中国港湾建设,2018,38(5):60-63,73.(TIAN Rui,HE Rong-jian.Construction of Main Pier of the Channel Bridge for River-Sea Direct Ships for the Hongkong-Zhuhai-Macao Bridge[J].China Harbour Engineering,2018,38(5):60-63,73.in Chinese)
[11]方焘,靳贵龙,付天华.软弱地层中深水基础钢围堰结构施工稳定性分析[J].结构工程师,2018,34(1):138-144.(FANG Tao,JIN Gui-long,FU Tian-hua.Stability Analysis for Steel Cofferdam during the Jumbo Deep Water Foundation Construction in the Weak Formation[J].Structural Engineers,2018,34(1):138-144.in Chinese)
[2]国家海洋局第三海洋研究所.平潭上岛铁路海坛海峡大桥工程可行性研究水文分析计算专题报告[R].厦门:2013.(Third Institute of Oceanography,State Oceanic Administration.Feasibility Study Report on Hydrological Analysis and Calculation of Pingtan Straits Rail-cumRoad Bridge[R].Xiamen:2013.in Chinese)
[3]王东辉.平潭海峡公铁两用大桥非通航孔引桥围堰设计与施工[J].桥梁建设,2016,46(3):1-5.(WANG Dong-hui.Design and Construction of Cofferdam for Non-Navigable Span Approach Bridge of Pingtan Straits Rail-cum-Road Bridge[J].Bridge Construction,2016,46(3):1-5.in Chinese)
[4]王东辉.平潭海峡公铁两用大桥航道桥基础设计与施工创新技术[J].铁道标准设计,2017,61(9):68-75.(WANG Dong-hui.Innovation Technology in Channel Bridge Foundation Design and Construction of Pingtan Strait Rail-cum-Road Bridge[J].Railway Standard Design,2017,61(9):68-75.in Chinese)
[5]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 Application of Steel Boxed Cofferdam on High-Rise Pile Cap in Deep Ocean Area[J].Architecture Technology,2016,47(6):533-536.in Chinese)
[6]金红岩.武汉青山长江公路大桥钢套箱围堰下沉施工技术[J].桥梁建设,2018,48(2):7-12.(JIN Hong-yan.Construction Techniques for Sinking of Steel Boxed Cofferdam of Qingshan Changjiang River Highway Bridge in Wuhan[J].Bridge Construction,2018,48(2):7-12.in Chinese)
[7]陈翔,梅新咏.平潭海峡公铁两用大桥主航道斜拉桥深水基础设计[J].桥梁建设,2016,46(3):86-91.(CHEN Xiang,MEI Xin-yong.Design of Deepwater Foundations of Main Ship Channel Cable-Stayed Bridge of Pingtan Straits Rail-cum-Road Bridge[J].Bridge Construction,2016,46(3):86-91.in Chinese)
[8]陈山亭.港珠澳大桥浅水区非通航孔桥下部结构施工关键技术[J].桥梁建设,2016,46(1):6-11.(CHEN Shan-ting.Key Techniques for Construction of Substructure of Non-Navigable Span Bridge of Hong Kong-Zhuhai-Macao Bridge over Shallow Water Area[J].Bridge Construction,2016,46(1):6-11.in Chinese)
[9]黄剑锋.港珠澳大桥浅水区非通航孔桥围堰设计[J].桥梁建设,2015,45(4):88-93.(HUANG Jian-feng.Design of Cofferdam for NonNavigable Span Bridge of Hong Kong-Zhuhai-Macao Bridge over Shallow Water Area[J].Bridge Construction,2015,45(4):88-93.in Chinese)
[10]田睿,何荣坚.港珠澳大桥江海直达船航道桥主墩承台施工[J].中国港湾建设,2018,38(5):60-63,73.(TIAN Rui,HE Rong-jian.Construction of Main Pier of the Channel Bridge for River-Sea Direct Ships for the Hongkong-Zhuhai-Macao Bridge[J].China Harbour Engineering,2018,38(5):60-63,73.in Chinese)
[11]方焘,靳贵龙,付天华.软弱地层中深水基础钢围堰结构施工稳定性分析[J].结构工程师,2018,34(1):138-144.(FANG Tao,JIN Gui-long,FU Tian-hua.Stability Analysis for Steel Cofferdam during the Jumbo Deep Water Foundation Construction in the Weak Formation[J].Structural Engineers,2018,34(1):138-144.in Chinese)