A type of ground improvement method that improves the water-tightness and safety of the ground by supplying a refrigerant into the ground and freezing the water underground. It is used when excavating soft ground with a high groundwater level or ground under a river. There are two methods: the brine method, in which a cooling liquid is circulated inside a freezing pipe to freeze the ground, and the method in which low-temperature liquefied gas is directly poured into the freezing pipe to freeze the ground using the heat of vaporization. The brine method is generally used. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
地盤内に冷媒を供給して,地中の水を凍結させることにより,地盤の止水性,安全性を高める地盤改良工法の一種。地下水位の高い軟弱地盤や河川の下の地盤を掘削する場合などに用いられる。冷却液を凍結管内に循環させて地盤を凍結させるブライン工法と低温液化ガスを直接凍結管に流し込み気化熱を利用して地盤を凍結させる方法とがあるが,一般にはブライン工法を用いることが多い。
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