Chemical Grouting Company, Ltd.

Yuichi Tachiwada

Tsutomu Tsuchiya

Takeru Ariizumi

Hiroshi Soma

The purpose of the present invention is to provide an artificial ground freezing method having good coolant thermal efficiency without a gas-phase coolant being released into the ground or into the air. For that purpose, the present invention has: a freeze pipe (: casing) for freezing the ground buried in the ground and a coolant circulation pipe () provided on the inside of the freeze pipe (), wherein the coolant flowing inside the coolant circulation pipe () is carbon dioxide; and a coolant apparatus () that cools and supplies the carbon dioxide to the coolant circulation pipe (), the coolant circulation pipe () comprising a first coolant circulation pipe (A) on which a plurality of micro-coolant passages (A delta) is formed, wherein the tip portion (tip portion in the ground) of the first coolant circulation pipe (A) is connected to a plugging member (: bottom socket) that connects the plurality of micro-coolant passages (A delta) of the first coolant circulation pipe (A) to a coolant supply side and coolant return side.

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Chofu, Japan

Yuichi Tachiwada