Title:
CONTROL METHOD OF FREEZING OF GROUND IN IN-SITE GROUND FREEZING SAMPLING METHOD
Document Type and Number:
Japanese Patent JP3733492
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To shorten a freezing time by a method wherein an auxiliary freezing means is juxtaposed together with a freezing pipe up to a required depth section from the lower-end site of a guide pipe to a lower section, a refrigerant is circulated to the freezing pipe and the freezing of the ground is promoted, and the auxiliary freezing means is worked and the freezing of the ground in a region just under the guide pipe is accelerated in a duplex manner.
SOLUTION: An auxiliary freezing means 11 is juxtaposed together with a freezing pipe 2 to a required depth section from the lower-end site of the guide pipe 1 installed to the ground surface section of an in-site ground to a lower section, concretely a section within a range of depth H2, in which the progress of freezing is delayed. A refrigerant is circulated through the freezing pipe 2 to promote the freezing of the ground, and the auxiliary freezing means 11 is worked and the freezing of the ground in a region just under the guide pipe 1 is accelerated in a duplex manner. Accordingly, the freezing of the region just under the guide pipe is promoted comparatively quickly, and a freezing time can be shortened.
Inventors:
Atsushi Ohara
Onishi Akimitsu
Shunichi Fukumoto
Onishi Akimitsu
Shunichi Fukumoto
Application Number:
JP9973696A
Publication Date:
January 11, 2006
Filing Date:
April 22, 1996
Export Citation:
Assignee:
Tokyo Soil Research Co., Ltd.
International Classes:
E21B25/08; (IPC1-7): E21B25/08
Domestic Patent References:
| JP63194017A | ||||
| JP4052804B2 | ||||
| JP598882A | ||||
| JP5230824A | ||||
| JP3286093A |
Attorney, Agent or Firm:
Masahiko Yamana