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| 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) |
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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.
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Received: 10 December 2010
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2011, Vol. 30 
