龙溪嘉陵江特大桥主墩深水基础钢围堰渡洪方案及分析  

Flood Control Scheme and Analysis of Steel Cofferdam for Deep-water Foundation of Main Pier of Longxi Jialing River Bridge

作　　者：王思文 欧阳华 罗华 WANG Siwen;OUYANG Hua;LUO Hua(The Eighth Engineering Co.,Ltd.,of CCCC First Highway Engineering Co.,Ltd.,Tianjin 300000;Bridge&Tunnel Engineering Co.,Ltd.,of CCCC First Highway Engineering Co.,Ltd.,Changsha 410114;Hunan Institute of Science and Technology,Yueyang 414000)

机构地区：[1]中交一公局第八工程有限公司,天津300000 [2]中交一公局桥隧工程有限公司,长沙410114 [3]湖南理工学院,湖南岳阳414000

出　　处：《公路交通技术》2021年第1期73-80,共8页Technology of Highway and Transport

基　　金：湖南省自然科学基金项目(2020JJ5216);湖南省普通高等学校教学改革研究项目(HNJG-2020-1328);湖南理工学院教学改革项目(2020B31)。

摘　　要：针对龙溪嘉陵江特大桥主桥8#主墩钢套箱围堰在深水、洪水期大流速条件下的渡洪问题,对钢围堰在拼装、下放至下沉各阶段的渡洪措施以及洪水期施工钢围堰所受外力及结构的稳定性进行了研究。结果表明:采用钢护筒内部灌砂、围堰连接钢护筒并焊接限位工字钢、连接迎水面钢护筒共同受力、焊接螺旋状钢筋环提高钢护筒与封底混凝土粘结力等渡洪技术,可满足围堰渡洪强度、地基承载力及稳定性的要求。Aiming at the flood resistance problem of steel jacket box cofferdam for 8#main pier of Longxi Jialing River Super Large Bridge in deep water and flood period with large flow velocity,the flood control measures of steel cofferdam in the stages of assembly,lowering and sinking,the external force and structural stability of steel cofferdam in flood period are studied.The results show that the flood controlling technologies,such as filling sand into steel casing,connecting cofferdam with the steel casing and welded with the limiting I-beam,connecting the steel casings on the upstream,welding spiral reinforcement ring to improve the bonding force between steel casing and bottom sealing concrete,can meet the requirements of strength and the foundation bearing capacity and stability of the cofferdam.It can provide reference for the design and construction of steel cofferdams under similar environmental conditions in the future.

关 键 词：双壁钢套箱钢围堰 渡洪 钢护筒 稳定性 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]