Partial freeze sampling |
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| 申请号 | JP20869983 | 申请日 | 1983-11-07 | 公开(公告)号 | JPS60100737A | 公开(公告)日 | 1985-06-04 |
| 申请人 | Tokyo Soiru Res:Kk; | 发明人 | MAKIHARA YORIO; | ||||
| 摘要 | PURPOSE:To facilitate operation without requiring a large quantity of refrigerants by performing sampling at optional depth by a freeze sampling method for obtaining the deformation characteristics of the ground. CONSTITUTION:A large-diameter hole 10 is digged and digging is further carried on with a small-diameter core tube 14 from the bottom of the hole 10. A samll- diameter freeze tube 17 is linked atop a heat insulating tube 16 is a disconnectable state, and the heat insulating tube 16 is covered with glass to constitute a double tube. A thermometer 18 is fitted to a synthetic resin round rod with the same diameter with the freeze tube 17 at the tip of the freeze tube 17 so as to control freeze temperature. An injection tube 19 is inserted into the heat insulating tube 16 and liquid nitrogen is injected to freeze the ground layer at the circumference of the heat insulating tube 16. In this case, water is circulated through a feed water tube 24 so as to prevented the underground water at the circumference of the heat insulating tube 16 from freezing. The heat insulating tube 16 is disconnected from the freeze tube 17. The frozen ground is digged surrounding the freeze tube 16 by using a core tube 22. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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