Forty, 4-inch diameter, steel closed-end freeze pipes, plus a comprehensive array of piezometers and temperature monitors, installed through the overburden soils and extending 15 feet into the underlying sound rock.
Read MoreCombined Sewer Overflow Tunnel
The overall project involved the freezing of four shafts excavated by conventional methods, plus an additional two shafts which were raise bored through frozen ground.
Read MoreKansas Underground Salt Museum
Ground freezing was the owner’s method of choice to stabilize more than 135 feet of sand and unstable mudstone overburden to ensure completely dry and stable elevator shaft excavation.
Read MoreNew York City Water Tunnel No. 3
Moretrench used artificial ground freezing toprovide ground support and groundwater controlprotection at five shaft locations in midtown Manhattan.
Read MorePatent – Groundfreezing installation accommodating thermal contraction of metal feed pipes
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.
Read MorePatent – Method and apparatus for artificial ground freezing
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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