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深水基础钢套箱围堰施工技术


深水基础钢套箱围堰施工技术 摘要: 目前桥梁深水基础及墩台施工中采用的防水围堰有以下几种:单壁钢 围堰(方形和圆形) ,钢吊箱,双壁钢围堰,钢板桩围堰,锁口钢管桩围堰等, 其中钢板桩,锁口钢管桩亦可用在基坑开挖施工。本文先方形钢围堰施工方法。 以中铁七局南昌信江大桥深水基础钢套箱围堰施工方法为例, 再据此施工方法探 讨更合理有效的围堰施工方法。 利用 midas civil2010 软件介绍钢套箱围堰施工步 序,分析各工况的受力状态。对围堰设计、拼装、下沉、加固、堵漏、浇注封底 砼等有关施工技术进行了阐述。 关键词: 钢套箱;围堰设计;施工工艺; 工况检算 Abstract: the current bridge deep water foundation and pier construction adopted waterproof cofferdams are the following: single wall steel cofferdam (square and round ), steel hanging box, double wall steel cofferdam, steel sheet pile cofferdam, lock steel pipe pile cofferdam, steel sheet pile, wherein, the lock steel pipe pile can also be used in the excavation of foundation pit construction. This paper first square steel cofferdam construction method. In seven Bureau of China Railway Nanchang river bridge deep foundation steel boxed cofferdam construction method as an example, and based on the construction method of more reasonable and effective cofferdam construction method. Using the Midas civil2010 software introduced steel boxed cofferdam construction step, analysis the condition of stress state. On cofferdam design, assembling, sinking, reinforcement, plugging, pouring bottom concrete and related construction technology is introduced. Key words: steel box cofferdam; design; construction technology; case check 一、工程概述 瑞 洪 信 江 特 大 桥 K168+031.44 ~ K169+694.56 全 长 1.663km , 主 桥 为 47m+2*80m+47m 四跨变截面预应力连续箱梁桥,主桥 23#、24#墩基础采用 4 根 φ2.40m 的钻孔灌注桩,承台尺寸为 10.4m(长)× 10.00m(宽)× 4.0m(高) 。 本文叙述的重点是两种围堰的对比分析,所

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