2012年9月上 施工技术 -第41卷第372期 CONSTRUCTION TECHNOLOGY 31 新型组合围堰施工技术 阮建中，周霄 (杭州天恒投资建设管理有限公司，浙江杭州310004) [摘要]结合某大桥边主墩承台施工实例，采用了一种双壁钢围堰和吹砂围堰相结合的新型组合围堰施工技术. 详细介绍了在水位有明显季节性变化的河流中进行承台施工的实际情况，包括主要施工步骤，井点降水计算及验 证，工程实施情况.该工程实例表明，采用该项施工技术，节约了施工投人，达到降本增效的目的，加快了施工进 度，且便于质量控制. [关键词]桥梁工程；承台；围堰；施工技术 [中图分类号]TU753.62;U445.55 [文献标识码]A [文章编号]1002-8498(2012)17-0031-04 Construction Technology of New Combined Cofferdam Ruan Jianzhong Zhou Xiao Hangzhou Tianheng Investment and Construction Management Co.Ld.Hangzhou Zhejiang 310004 China) Abstract:A new technology was adopted during the pile cap construction of the side main pier for a bridge which bined double-wall steel cofferdam and blowing sand cofferdam to develop a new kind of cofferdam.The pile cap construction in rivers with seasonal changing water levels was introduced in detail including the main construction procedures calculation and verification of well point dewatering engineering application performance.Engineering practice shows that the new construction technology can save construction investment accelerate construction progress and ensure construction quality. Key words:bridges;pile caps;cofferdams;construction 1工程概况 水深较浅，根据现场实测，河流常水位在3.800m左 某大桥水中边主墩承台呈哑铃形，最大平面尺 右，墩位处河床标高约为1.000m 且河床还在缓慢 寸为38.2m×9.2m 承台设计底标高-4.500m 厚 淤积.河床在承台施工的高度范围内为沉积砂层. 3.5m 结构如图1所示. 2施工方案 桥梁中 2.1常规施工方案 -1.000 本桥承台底标高远低于河床标高和河流常水 器 中心 位，属于典型的深水低桩承台.根据以往的工程施 工经验，该类型承台最常规的施工方案为双壁钢围 38202 堰法施工，即在基桩施工完成后，加工拼装双壁钢 图1基桩、承台结构示意 围堰，将钢围堰抽砂下沉到设计标高后采用水下混 Fig.1 Structure of ...
新型组合围堰施工技术.pdf
