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 Back to Projects
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Project:
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Secant Pile Emergency Repair
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Location:
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Seattle, Washington
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Client:
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Frank Coluccio Construction Company
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Description:
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Excavation support and ground water control for a micro tunnel receiving shaft was attempted using a
system of secant piles. At one specific location, a gap existed between adjacent piles, resulting in
the flooding of the shaft during excavation. The contractor initially attempted a repair using a
process of chemical grout injection. This method failed to seal the breach, resulting in the need for
an emergency repair using ground freezing.
Layne Christensen Company was mobilized to the site and drilled and installed three freezing and one
temperature monitoring pipe. The pipes were connected to an electronically controlled cryogenic
distribution manifold. The breach in the wall was frozen in four days and excavation resumed. A unique
aspect of this project was that the failed chemical grouting process raised the ground temperature by
approximately 10 degrees C. This added approximately one additional day to the ground freezing and
increased the liquid nitrogen volume by 20 percent.
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