深水基础钢吊箱围堰施工技术
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深水基础钢吊箱围堰施工技术
作者:穆智军
来源:《城市建设理论研究》2012年第31期
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。本文是以中铁七局南昌信江大桥深水基础钢套箱围堰施工方法的拓展。利用midas civil2010软件先介绍钢吊箱围堰施工步序,分析各工况的受力状态。从而研究钢吊箱围堰进行施工方法和受力检算。文中对围堰设计、拼装、下沉、加固、堵漏、浇注封底砼等有关施工技术进行阐述。
关键词:钢吊箱;模拟设计;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 foundation pit excavation. This article is based on China Railway seven Bureau of Nanchang letter river bridge deep water foundation steel boxed cofferdam construction method to expand. Use Midas civil2010 software to introduce steel hanging box cofferdam construction step, analysis under the stress state. In order to study the steel boxed cofferdam construction method and stress calculation. The cofferdam design, assembly, sinking, reinforcement, plugging, pouring bottom concrete and other related construction technology is analyzed.
Key words: steel hanging box; simulation design; construction technology; case check 中图分类号: 文献标识码:A 文章编号:2095-2104(2012)
一、钢吊箱设计
计算模型采用:承台顶和底标高,分别在水面下1.5m 和5.5m ;水深12m ,河床附着层1m ;钢吊箱围堰尺寸为12m×12m ,以承台底标高为参照,围堰高6.5m ;钻孔灌注桩为4根φ2.4m,承台尺寸为10.4m× 10.0m×4.0m 。钢吊箱由钢护筒牛腿、底板、侧板、内支撑等组成,其中侧板、底板是吊箱围堰的主要围水结构,钢护筒牛腿是整个围堰的主要支撑。(见图1:钢吊箱总图)。机械设备配置同上。
二、施工工艺流程
施工调查和放样→钢护筒牛腿定标高、焊接→打钢护筒→搭设钻机施工平台(桩基础施工完毕)→拼装钢套箱底板→拼装钢套箱侧板→安装内支撑→下沉固定→封底→破桩头(割除桩头护筒)→承台施工→拆除。