大直径三岔双向挤扩灌注桩及其应用.pdf

2012年4月上 施工技术 第41卷第362期 CONSTRUCTION TECHNOLOGY 55 大直径三岔双向挤扩灌注桩及其应用 王雷，韩丰2 (1.北京东方华脉工程设计有限公司，北京100036；2.中国农业大学后勤恭建处，北京100083) [摘要】对三岔双向挤扩灌注柱在衡水某工程中的应用进行了总结，并与普通灌注桩施工方案进行了经济效益比 较.分析了三岔双向挤扩灌注柱的优势，其应用提高了单桩承载力，减少了柱数，使桩位布置更合理.通过分析沉 降观测数值，证明三岔双向挤扩灌注桩应用的合理性.对《三岔双向挤扩灌注桩设计规程》JGJ171一2009中关于大 直径单桩竖向极限承载力标准值的计算提出了建议. [关键词]地下工程：桩基础；三岔双向挤扩灌注桩；承载力；沉降；经济效益 [中图分类号]TU753.3 [文献标识码]A [文章编号]1002-8498(2012)07-0055-03 Application of Large Diameter Cast-in-place Piles with Expanded Branches and Bells By 3-way Extruding Arms Wang Lei' Han Feng2 (1.China Humax Engineering Design Co.Lad.Beijing 100036 China:. 2.Logistics Construction Department China Agricultural University Beijing 100083 China) Abstract:The authors summarize application of cast-in-place piles with expanded branches and bells by 3-way extruding arms of some project in Hengshui make parison with mon piles and analyze the advantages of cast-in-place piles with expanded branches and bells by 3-way extruding arms.Application of cast-in-place piles with expanded branches and bells by 3-way extruding arms can improve bearing capacity of single pile reduce the number of piles and make the pile arrangement more reasonable. According to the analysis of the settlement observation value the rationality of the application of cast-in- place piles with expanded branches and bells by 3-way extruding arms can be proved.The authors give advice on calculation of ultimate bearing capacity of the large diameter single pile in Design specification fo...