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North Lombard Railroad Overpass
Portland, Oregon
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Jet Grouting
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Double-fluid jet grout columns are installed for seismic stabilization of a new bridge foundation.
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Project Overview: |
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A new bridge has been constructed as an overpass to busy rail lines in Portland, Oregon. Layne GeoConstruction
installed a total of 119 jet grout columns to provide seismic stabilization of the new bridge foundation at Bent
3. The soil at this location was primarily a loose sand with silt subject to liquefaction, thereby necessitating
ground improvement using jet grouting.
The double-fluid system of jet grouting was utilized to create column diameters of 1.3 meters, installed to
depths of 24 meters. The columns were connected in a cellular arrangement utilizing a 50% replacement ratio.
Extensive utilities, including: fiber optic; two phone conduits; steel gas line; 300mm storm sewer; and an 865mm
sewer force main were present at the treatment area requiring the installation of numerous battered columns and
implementation of controlled jet grouting methods.
Unconfined compressive strengths up to 15,600 kPa were achieved in the jet grout production columns.
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Value of Work Performed: |
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$600,000 |
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Project Duration: |
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1 month |
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Project Completion Date: |
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June 2004 |
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Project Reference: |
Project Owner:
City of Portland, Oregon
Office of Transportation
Denise Dietrich
(503)235-5185
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Engineer:
CH2mHiII
Dave Dailer
(503) 235-5000
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General Contractor:
Cascade Bridge LLC
Dave Mingo
(360) 737-6576
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