I-90 Corridor included these retaining walls projects:

• I-90: 80th Avenue to Island Crest Way: Preliminary and final design, contract plans, specifications, and cost estimates for the 258-foot long, 131-foot wide bridge. Slurry wall abutments were used as substructure to eliminate shoring. Designed as a lid over I-90, the bridge sustains six feet of soil for landscaping -- equivalent in weight to a seven-story high-rise building. It was also designed to take lateral loads due to winds because of the 40-foot trees to be placed on the structure. The seismic design of this bridge takes into consideration the weight of the structure and six feet of soil.
• I-90: Luther Burbank to East Mercer Connection: As part of value engineering, replaced nearly 100,000 square feet of slurry wall with newly developed drilled shaft spaced pile design to save construction time and cost for the owner and drilling contractor.
• I-90: Shorewood Apartment Emergency Slurry Walls: Permanent cantilever and tieback diaphragm slurry walls, fast-tracked in 60 days due to mud slide below the Shorewood Apartments. Design included a combination rectangular slurry wall with tiebacks and tee section slurry wall without tiebacks.
• I-90: Luther Burbank Emergency Soldier Pile Wall: During construction, INCA was called to respond to an emergency closure of the westbound lane of I-90 when heavy rainfall caused the hillside to slide on to the outside lane, completely stopping the flow of traffic. INCA was contacted and was on site within the hour. One lane of traffic flow was reopened the same day. All lanes were operational within two days.
• I-90: Shorewood Undercrossing: Complete analysis of stage two construction and design of Pier 1 using space pile with precast fascia wall for two contractors. Design met structural requirements, and saved construction time and money.
• I-90: Soldier Pile and Cantilevered Retaining Walls: Temporary soldier pile walls and permanent cantilevered retaining walls for the Luther Burbank LID to East Mercer Island interchange.
• I-90: Spaced Pile Diaphragm Wall: Replaced over 150,000 square feet of slurry wall with newly developed drilled shaft spaced pile wall to save construction time and cost for owner and DBM/foundations contractor.
• I-90: East Mercer Interchange Redesign/Build: Value engineering and redesign of slurry wall. Included design calculations and sketches to reinforce concrete cantilevered drill shaft. Cast-in-place, 4-foot diameter drilled shafts were used for quick construction and cost savings. Portions of the wall were cast-in-place concrete and were used above the shaft.

 I-90 Corridor Design (120.61 kB)

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