| 摘要 |
929,609. Soil stabilisation. CONCH INTERNATIONAL METHANE Ltd. Feb. 12, 1962, No. 5325/62. Class 68 (1). [Also in Group XXVIII] Freezing of the water-bearing earth surrounding a plurality of shafts 2 intended for stoning liquefied gases (see Group XXVIII) is effected by filling the shafts with water or drilling mud, introducing double pipes, and passing refrigerant therethrough until a sufficient layer of frozen earth is obtained and finally passing steam through the double pipes to thaw any ice formed in the liquid with which the shafts are filled. In a modification the shafts are filled with refrigerant which is afterwards withdrawn. Each shaft is lined with concrete, aluminium or steel. Specification 894,762 is referred to. |
