Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Development of Ground Freezing Method Using Natural Refrigerants and Its Application
This paper presents a newly developed ground freezing method in Japan. Instead of HCFC or HFCs, it uses NH3 and CO2 for freezing; both are natural refrigerants. Thanks to the use of natural refrigerants, the new method (CO2 freezing method) is not only good for the environment but also more effective in ground freezing than the conventional method. The two fundamental experiments conducted to verify the effectiveness of the ground freezing by natural refrigerants, and the outlines and the results are shown in this paper. Moreover, the application of the CO2 freezing method is also shown. The application was ground improvement work for shield tunneling at a depth of about 66 m, and the first use of newly developed flat-shaped perforated freezing pipes. Finally, the most recent experiment is introduced. It was a long-distance pumping experiment of CO2 refrigerant, and its purpose was to expand the scope of application to respond to social demands in Japan for use of a great depth underground. The result proved that CO2 refrigerant could be circulated in the distance of 1500 m from the plant to the freezing area, instead of about the typical 100 m.
Development of Ground Freezing Method Using Natural Refrigerants and Its Application
This paper presents a newly developed ground freezing method in Japan. Instead of HCFC or HFCs, it uses NH3 and CO2 for freezing; both are natural refrigerants. Thanks to the use of natural refrigerants, the new method (CO2 freezing method) is not only good for the environment but also more effective in ground freezing than the conventional method. The two fundamental experiments conducted to verify the effectiveness of the ground freezing by natural refrigerants, and the outlines and the results are shown in this paper. Moreover, the application of the CO2 freezing method is also shown. The application was ground improvement work for shield tunneling at a depth of about 66 m, and the first use of newly developed flat-shaped perforated freezing pipes. Finally, the most recent experiment is introduced. It was a long-distance pumping experiment of CO2 refrigerant, and its purpose was to expand the scope of application to respond to social demands in Japan for use of a great depth underground. The result proved that CO2 refrigerant could be circulated in the distance of 1500 m from the plant to the freezing area, instead of about the typical 100 m.
Development of Ground Freezing Method Using Natural Refrigerants and Its Application
Lecture Notes in Civil Engineering
Hazarika, Hemanta (Herausgeber:in) / Haigh, Stuart Kenneth (Herausgeber:in) / Chaudhary, Babloo (Herausgeber:in) / Murai, Masanori (Herausgeber:in) / Manandhar, Suman (Herausgeber:in) / Maejima, Kosuke (Autor:in) / Soma, Hiroshi (Autor:in) / Shioya, Yuta (Autor:in)
International symposium on Construction Resources for Environmentally Sustainable Technologies ; 2023 ; Fukuoka, Japan
29.02.2024
13 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Ground freezing method using liquid refrigerants and ground freezing apparatus
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