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Chelsea Branch Sewer Relief Project
Massachusetts Water Resources Authority
Chelsea, Massachusetts
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Jet Grouting
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Jet grouted columns provide ground improvement and underpinning for large diameter micro-tunnel
sewer replacement project in congested urban area.
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Project Overview: |
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Layne GeoConstruction designed and constructed a system of jet grouted columns for ground improvement
and underpinning for a large diameter micro-tunnel sewer replacement project. Work was undertaken on a
congested arterial route, and performed from the pavement grade. Single-fluid jet grouting was utilized
to reduced impacts to the roadway, which allowed for immediate restoration of traffic flow upon
completion of a series of columns.
Jet grouting was performed along the alignment of the replacement sewer tunnel prior to the installation
of the 66-inch and 48-inch diameter micro-tunnels. The column configuration consisted of secant jet
grouted column rows for the full alignment of the pipe where organic soils were encountered. Each row
consisted of jet grout columns which were installed above the pipe crown level and extended below the
pipe invert through the organic materials to competent bearing soils, at approximately 35 feet deep. Jet
grouting was also performed at receiving and jacking pits to provide a continuous starter block of grout
for the initial drive of the micro-tunnel machines.
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Value of Work Performed: |
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$925,000 |
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Project Duration: |
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3 months |
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Project Completion Date: |
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September 2000 |
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Project Reference: |
Engineer Consultant:
Bryant Associates
Howard Golberg
(617) 951-6350
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