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Mystic Station Power Plant
High Voltage Duct Bank Project Site International
Independent Energy
Everett, Massachusetts |
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Drilled Micropiles |
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Numerous piles were installed in the restricted access area of an existing switchyard. |
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Project Overview: |
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Layne GeoConstruction designed and installed over 5,000 linear feet of 15-ton capacity auger cast
piles for support of a new high-voltage duct bank. The piles were required due to the presence of
compressible organic soils below the duct bank elevation.
In excess of 150 piles were installed, using the auger cast method, through fill and organics, and
into stiff clay. The average depth was approximately 30 feet for the 12-inch diameter piles. Special
tooling with a large hollow stem was used during installation to eliminate the necking effect common
to this installation technique. One load test was successfully performed in tension to twice the
design capacity.
The majority of the pile locations required working off-hours, to coordinate with other contractors
on a confined site. Over 50 piles were located in restricted access areas, within an existing
switchyard.
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Value of Work Performed: |
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$450,000 |
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Project Duration: |
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8 months (intermittent) |
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Project Completion Date: |
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June 2001 |
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Project Reference: |
Project Engineer:
Washington Group / Fluor Daniel
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