Nitrogen exploring cooling against ice-hydraulic impacts

摘要

In the mid 1970s, the specialists of Russian Tunneling Association, Russian Scientific Center "Applied Chemistry", Freezing Academy launched for St. Petersburg Metro Construction company "Metrostroy" liquid nitrogen soil freezing program for "Washout" site tunneling in northern section of St. Petersburg metro line 1. For emergency quicksand zone excavation from July, 1974 up to November, 1975 JSC "Metrostroy" spent 7900 ton of nitrogen. On Kanonersky road transport submarine tunnel in St. Petersburg Sea Port cryogenic technologies were used for sealing joints between sections and mounting cross-cut foundation pit ice walls. From 1982 to the within 3.5 years period a total liquid nitrogen consumed was about 13,000 ton.