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South Boston Piers Transitway — Silver Line
Russia Wharf & Fort
Point Channel Tunnel
MBTA Contract E02CN15
Boston, Massachusetts |
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Drilled Micropiles |
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Eighty-eight drilled micropiles were installed to underpin an historic, seven-story building in
downtown Boston, in areas with less than 10 feet of headroom.
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Project Overview: |
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Layne GeoConstruction designed and constructed a drilled micropile system for underpinning support
of an historic, seven-story building in downtown Boston. The underpinning of the building was integral
to subsequent NATM work by the general contractor. The drilled micropile system was installed in areas
presenting difficult and limited access, with less than 10 feet of headroom, and isolated pile locations
in less than 8 feet of headroom.
The drilled micropiles were installed through urban fill, organics, Boston Blue Clay, glacial till, and
weathered rock. Each micropile, with capacities of 85, 132, and 200 tons, were successfully load tested
to twice their design values; with the exception of the 200 ton piles, which were tested to 325 tons. In
total 88 drilled micropiles were installed to depths of 130 feet.
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Value of Work Performed: |
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$1,000,000 |
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Project Duration: |
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6 months |
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Project Completion Date: |
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June 2001 |
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Project Reference: |
Owner:
Mass. Bay Transportation Authority
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Geotechnical Engineer of Record:
Meuser Rutledge Consulting Engineers
(212) 490-7110
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