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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