深水大流速倾斜岩面河床不等高双壁钢围堰综合施工技术研究
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摘要
以石梯巴河特大桥12#、13#主墩基础双壁钢围堰施工为背景,分析了工程的难点,重点对深水大流速倾斜岩面河床条件下双壁钢围堰的结构设计、安全沉降以及封底混凝土结构设计与施工进行研究。通过采用不等高双壁钢围堰的设计,利用既有栈桥设置双壁钢围堰就位的限位架,结合吊车的使用,成功使不等高双壁钢围堰准确就位;同时运用桩基约束模型,在封底混凝土薄弱区域加强配筋,突破常规的封底混凝土采用素混凝土结构这一理念,减小封底混凝土厚度,节约了混凝土圬工工程量。该项综合技术的使用,施工质量优良,各项指标均满足设计要求,加快了施工进度,节约钢材约40 t,节约投资约32万元,取得良好的社会、经济效益,可为类似工程提供参考。
Based on the construction of double wall steel cofferdam for the 12#and 13#main pier foundation of Shitiba River Bridge,the difficulties of the project are analyzed.The structural design,safe settlement and the design and construction of the bottom sealing concrete structure of the double wall steel cofferdam under the condition of the inclined rock surface riverbed with large velocity in the deep water are studied.By adopting the design of double wall steel cofferdam with unequal height,using the limited position frame of the double wall steel cofferdam located in the existing trestle,and combined with the use of the crane,the double wall steel cofferdam with unequal height is successfully placed,and the pile foundation constraint model is used to strengthen the reinforcement in the weak area of the bottom sealing concrete and break through the conventional bottom sealing with plain concrete.The concept reduces the thickness of the bottom sealing concrete and saves the amount of concrete masonry.By using this comprehensive technology,construction quality is excellent,and all the indicators meet the design requirements with speeding up the construction progress,saving about 40 t of steel,retrenching about 320 thousand yuan,and achieving good social and economic benefits.It can provide a reference for similar projects.
Based on the construction of double wall steel cofferdam for the 12#and 13#main pier foundation of Shitiba River Bridge,the difficulties of the project are analyzed.The structural design,safe settlement and the design and construction of the bottom sealing concrete structure of the double wall steel cofferdam under the condition of the inclined rock surface riverbed with large velocity in the deep water are studied.By adopting the design of double wall steel cofferdam with unequal height,using the limited position frame of the double wall steel cofferdam located in the existing trestle,and combined with the use of the crane,the double wall steel cofferdam with unequal height is successfully placed,and the pile foundation constraint model is used to strengthen the reinforcement in the weak area of the bottom sealing concrete and break through the conventional bottom sealing with plain concrete.The concept reduces the thickness of the bottom sealing concrete and saves the amount of concrete masonry.By using this comprehensive technology,construction quality is excellent,and all the indicators meet the design requirements with speeding up the construction progress,saving about 40 t of steel,retrenching about 320 thousand yuan,and achieving good social and economic benefits.It can provide a reference for similar projects.
引文
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[2]刘波明,庄永菁.普和金沙江特大桥双壁钢围堰施工技术探讨[J].公路交通技术,2017,33(5):72-76,81.
[3]李荣.双壁钢围堰支撑体系优化设计研究[J].中外公路,2018,38(1):187-191.
[4]杨齐海,何加江.公安长江公铁两用特大桥4号墩钢围堰施工技术[J].桥梁建设,2015,45(5):99-104.
[5]郭煜.新白沙沱长江特大桥3号墩双壁钢围堰设计与施工[J].交通科技,2016(1):41-44.
[6]王贵春,皇甫昱.桥梁深水基础双壁钢围堰施工技术分析[J].铁道建筑,2007(8):22-24.
[7]刘畅.某特大桥双壁钢围堰设计与施工[J].国防交通工程与技术,2017,15(1):50-53,80.
[8]杨超锋.大型双壁钢围堰筑岛下沉就位施工技术[J].山西建筑,2013,39(26):158-160.
[9]宋华清,唐衡,林道锦.嘉绍大桥主墩双壁钢围堰施工技术[J].桥梁建设,2012,42(4):100-106.
[10]郭成刚.深水大直径双壁钢围堰封底混凝土厚度设计与施工技术[J].铁道建筑技术,2015(3):63-66.
[11]郑育林,江小鹏.重庆嘉陵江大桥深水基础双壁钢围堰设计与计算[J].施工技术,2012,41(S2):137-141.
[12]杨永伟,戴桂华,徐阳,等.张花高速酉水大桥5号主墩深水双壁钢围堰施工技术[J].公路工程,2013,38(5):193-198.