ISSN 2096-4498

   CN 44-1745/U

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Tunnel Construction ›› 2010, Vol. 30 ›› Issue (5): 591-595.

• wenzhang • Previous Articles     Next Articles

Application of Liquid Nitrogen Freezing Technology in Maintaining of
Tail Skin Brushes in Stratum with Confined Water

 HE  Tian-Ming   

  1. China Railway Tunnel Stock Co., Ltd., Zhengzhou 450003, China
  • Received:2010-06-17 Revised:2010-09-30 Online:2010-10-15 Published:2010-10-27

Abstract:

The application of liquid nitrogen freezing technology in maintaining of the tail skin brushes in stratum with confined groundwater is presented on basis of the actual experience in Qiantang River crossing tunnel at Qingchun Road in Hangzhou. The freezing hole design, refrigeration design, temperature monitoring and freezing hole construction are presented in detail. The practice shows that the problem of stratum consolidation and water sealing during the tail skin brush maintenance can be successfully solved by liquid nitrogen freezing technology. This technology can provide reference for shield boring in similar stratum with confined groundwater in the future.

Key words: liquid nitrogen freezing technology, stratum with confined water, tail skin brush, maintenance