the definitive ground freezing resource
Patent 7,438,501: This invention provides a solution to the problem of feed pipe thermal contraction in a ground freezing system…the feed pipe is constructed of metal, preferably steel, so that its thermal contraction is much reduced compared to HDPE pipes.
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Patent 6,796,139: This invention encompasses a method and apparatus for ground freezing that makes use of cooling techniques resulting in circulating fluid temperature of -50°C (-58°F) or less. This has the great advantage of allowing the freeze pipes to be spaced relatively far apart while still creating an impermeable frozen earth barrier in a reasonable period of time.
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Structures designed to transfer storm runoff water from surface collector systems to deep large diameter tunnels pass through a variety of subsurface soils in the Milwaukee, Wisconsin area. During construction, problems developed relative to the use of conventional earth support systems. Ground freezing was selected for temporary ground support and ground water control…
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To extract minerals, while protecting neighboring bodies of water and preventing inflows of groundwater to the mine excavation, a frozen earth barrier was constructed around the perimeter of the proposed Aquarius open pit gold mine in Timmins, Ontario.
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Ground freezing was used for excavation support and groundwater control of a 13 m diameter 61 m deep drop shaft for the South Bay Ocean Outfall Tunnel in San Diego, CA. During the shaft excavation process, external piezometer readings indicated a sudden drop in groundwater levels…The use of investigative methods and remedial actions were able to overcome these adverse conditions resulting in a successful ground freezing project.
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