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WELCOME TO GROUNDFREEZING
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Ground freezing is a technique that has been used extensively for groundwater control
and excavation support in the underground construction industry for over 100 years.
The process involves the circulation of a refrigerated coolant through a series of
subsurface pipes to convert soil water to ice, creating a strong watertight material.
The material is so strong, in fact, that it is routinely used as the only method of
groundwater control and soil support for the construction of shafts hundreds of feet
into water-bearing soils.
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Most ground freezing systems are quite similar in principal. The single most important co
mponent of a ground freezing system is the subsurface refrigeration system, consisting of
a series of refrigeration pipes installed with various drilling techniques. Depending upon
the application, the coolant can be brought to temperatures well below -150 degrees celcius.
Ground freezing can be achieved by using either a large portable refrigeration plant or
liquid nitrogen. After the initial freezing has been completed and the frozen barrier is in
place, the required refrigeration capacity is significantly reduced to maintain the frozen
barrier.
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