STUDY OF BLOCKAGE ACCIDENT OF PRE-EMBEDMENT GROUTING PIPES AND ITS CORRESPONDING TREATMENT METHOD
ZHANG Qianqing 1,2,ZHANG Zhongmiao 1,2
(1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China;
2. Institute of Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China)
Abstract:This paper presents an accident caused by unopened pre-embedded grouting pipes of working piles at a site of Zhejiang Province,and then proposes construction measures of post-grouting conducted using two pre-embedded grouting piles,a borehole drilled in pile shaft and a hole embedded in soil around pile. The variation of grouting pressure and grouting amount with time during different schemes of post-grouting was also discussed. In the scheme of post-grouting conducted using a borehole drilled in pile shaft,rubber packer can be used to avoid cement sully leakage,while rubber packer and swelling water-stopper can be adopted to prevent cement sully leakage,as well as intermittent grouting technique being employed,in the scheme of post-grouting conducted with a borehole embedded in soil around pile.
中华人民共和国行业标准编写组. JGJ 94—2008建筑桩基技术规范[S]. 北京:中国建筑工业出版社,2008.(The Professional Standards Compilation Group of People?s Republic of China. JGJ 94—2008 Technical code for building pile foundations[S]. Beijing:China Architecture and Building Press,2008.(in Chinese))
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