FREEZING AND SAMPLING METHOD FOR IN SITU GROUND AND GUIDE TUBE

Japanese Patent JP3648641

B2

PURPOSE: To fulfill a function as a function as a guide tube, and prevent the separation of the guide tube from ground by circulating a coolant through a freezing tube for freezing the ground, and inserting a core tube for collecting the soil sample of an non-turbulent zone.
CONSTITUTION: A guide tube 1 is formed out of a combination of a single freezing tube insertion tube 2 at a center, and a total of four core tube insertion tubes 3 arranged thereon at positions presumably corresponding to a non-turbulent zone. In this case, each of the tubes 1 and 4 is combined in an upright state, and integrated with one another by welding or the like, thereby fixing a piping relationship. Thereafter, cooling tubes 7 are installed on the lower side of a positioning plate 4 at a lower position, so as to enclose the external surface of the core tube insertion tubes 3, and the inlet and outlet 7a and 7b of the tubes 7 are raised. then, subsoil at a home position planned for taking a ground sample is excavated and the guide tube 1 is inserted therein for vertical installation. Thereafter, a refrigerant is circulated through a freezing tube to freeze subsoil immediately below the guide tube 1 as well as along a lower peripheral section. The guide tube 1 is thereby fixed and the core tubes are inserted therein for collecting soil samples.

Atsushi Ohara
Onishi Akimitsu

JP16193095A

May 18, 2005

June 28, 1995

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Tokyo Soil Research Co., Ltd.

E21B25/00; (IPC1-7): E21B25/00

JP3005512A
JP55055727A

Masahiko Yamana

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