Portland-Milwaukie Light Rail Bridge Construction, June 2011 - TriMet

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Cofferdam <strong>Construction</strong> Sequence• Fill cofferdam with sand and gravel• East tower foundation:8,500 cubic yards• West tower foundation:2,200 cubic yards• West side is roughly20’ shallower thaneast side16
Drill Shafts for Tower Foundation6 drilled shafts per tower Shafts are 10’ indiameter Drilled down 150’ to 170’ Pile cap: concretecover over the6 drilled shafts Pile cap is10’ to 18’ thick Together, the shaftsand pile cap serve asthe tower foundationPile Cap and Shafts(in red)17
Page 1 and 2: June 2011Building the Portland-Milw
Page 3 and 4: Cable-Stayed Bridge 1,720’ long L
Page 5 and 6: Four-Pier Cable-Stayed BridgeWest T
Page 8 and 9: Each towerfoundation iscreated from
Page 10 and 11: Cofferdam for Building Base and Tow
Page 12 and 13: Cofferdam Construction Sequence•
Page 14 and 15: Cofferdam Construction Sequence•
Page 18 and 19: Oscillator will install 10’ diame
Page 20 and 21: Drilled Shaft Installation• Each
Page 22 and 23: Temporarysupport cablesPermanentcab
Page 24 and 25: Watch live, time-lapsed videoof the
Page 28: Terminology Tower 3 - west tower To

Portland-Milwaukie Light Rail Bridge Construction, June 2011 - TriMet

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