王石高1，  李祖民2，  易广智1

(1湖南省建筑设计院，长沙410011; 2常德市第一人民医院基建办，常德415000)

 

[摘要] 通过湖南地区一栋20层高层建筑采用后注浆长螺旋钻孔灌注桩基础的工程实例，并与相邻高层建筑非后注浆长螺旋钻孔灌注桩基础的比较分析，认为在湖南地区相似的工程地质场地内采用后注浆长螺旋钻孔灌注桩基础，单桩承载力提高60% ~120%，能大大降低工程造价，是一种比较安全经济的桩基础形式。文中还介绍了后注浆长螺旋钻孔灌注桩设计和施工方法。

[关键词] 长螺旋钻孔灌注桩；后注浆；单桩承载力；注浆量；注浆压力

中图分类号：TU473    文献标识码：A  文章编号：1002-848X(2012) S2-0492-06

 

Wang Shigao1,  Li zumin2,  Yi Guangzhi1

(1Hunan Provincial Architectural Design Institute, Changsha 410011, China; 2 Civil Construction Office of the First People's Hospital of Changde, Changde 415000, China)

 

Abstract: Through the research of an engineering instance of 20-story tall building with posterior grouting long spiral bored pile foundation in Hunan, and compared it with an adjacent tall building with long spiral bored pile foundation, we think that the bearing of a single posterior grouting long spiral bored pile will improve 60 percents to 120 percents in sinular engineering geology site in Hunan. The posterior grouting bored pile foundation can greatly reduce the engineering cost, basically it is a safe and economical pile foundation form. The thesis then introduced the design and construction methods of posterior grouting long spiral bored pile.

Keywords: long spiral bored piles; post-grouting; bearing capacity of a single pile; grout amount; grouting pressure