土工基础

›› 2015, Vol. 29 ›› Issue (3): 23-25.

• 工程实录 • 上一篇    下一篇

持力层桩端注浆优化应用研究

陈劲松1,陈鑫松2   

  1. (1.浙江文华建设项目管理有限公司，杭州 310012;2.黑龙江省第五测绘地理信息工程院，哈尔滨 150086）
  • 收稿日期:2014-10-12 出版日期:2015-06-20 发布日期:2015-06-26
  • 作者简介:陈劲松（1986-），男，一级注册建造师，经济师，助理工程师，主要研究方向为岩土工程。

Post Grouted Cast-In-Place Concrete Piles

CHEN Jinsong1，CHEN Xinsong2   

  1. (1.Zhejiang Wenhua Construction Project Management Co. Ltd.，Hangzhou 310012；2.Fifth Heilongjiang Academy of Surveying and Mapping Geographic Information Engineering ，Haerbin 150086)
  • Received:2014-10-12 Online:2015-06-20 Published:2015-06-26

摘要： 为降低施工难度、节省费用，对原设计采用的中风化泥质粉砂岩持力层进行调整，对调整后的砾砂持力层进行桩端注浆，以提高单桩竖向抗压承载力，经静载试验检测，承载力超过原设计以中风化泥质粉砂岩作持力层时设计要求的单桩竖向抗压承载力特征值，同时桩长缩短了约14 m，经持力层桩端注浆优化后经济效益显著，与原设计相比单根桩能够节省成本5 208元。

关键词: 钻孔灌注桩, 持力层, 注浆, 承载力, 静载试验

Abstract: The castinplace concrete pile was designed to have pile tip into the medium weathered clayey silty sandstone stratum and it was value engineered during the construction. The pile tip was shortened up to gravelly sand and post grouted in order to improve the axial capacity. The static load test indicated that the shortened and post grouted pile have a higher axial capacity than that of the original design value. The total pile length was able to be reduced by 14 meters. Each pile can save cost of 5,208 RMB.

Key words: Cast-in-Place Bored Concrete Piles, Bearing Strata, Post Grouting, Axial Capacity, Static Loading Tests