Boston, MA
Logan International Airport, I-90/Route 1A Interchange
Scope/Solutions
The modernization of Logan International Airport included the new I-90/Route 1A Interchange. SGH assisted several contractors that looked for assistance with understanding the complex system of reinforcement, post-tensioning ducts and anchorages, and conduits, as well as with concrete quality at a drilled shaft.
The elevated roadways are constructed of cast-in-place, post-tensioned concrete box girders and supported on individual concrete columns, concrete bents, and concrete abutments. The columns are supported on large diameter drilled shafts. SGH provided construction engineering services, including the following:
- Preparation of reinforcing bar shop drawings for box girders and straddle bents for direct use in fabrication, reducing delivery time by several weeks
- Preparation of integrated drawings of box girders and straddle bents showing post-tensioning ducts, anchorages and reinforcement, block outs, reinforcing steel, anchor bolts, earthquake restrainers, drainage systems, and utility conduits to help resolve conflicts between embedded items in advance of construction
- Evaluation of concrete quality in a major drilled shaft using extracted deep core samples
- Evaluation of out-of-tolerance drilled shaft reinforcement to show that the drilled shaft was able to carry design loads safely
- Evaluation and repair design for missing post-tensioning bars in one of the straddle bents
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Project Summary
2007
Completion Date
Solutions
New Construction
Services
Structures
Markets
Transportation & Infrastructure
Client(s)
Barletta Heavy Division
Specialized Capabilities
Temporary Construction
Key team members
Additional Projects
Northeast
MBTA Quincy Commuter Boat Terminal
The top of the wall moved outward and the soil behind the wall subsided several feet. SGH led a multi-disciplinary team to evaluate the seawalls and concrete wharf, recommended remedial work, and designed seawall and wharf stabilization measures.
Northeast
Massachusetts Bay Transportation Authority, Park Street Station
As part of a system-wide upgrade of light rail transit stations for improved accessibility, the Massachusetts Bay Transportation Authority (MBTA) needed to make structural modifications, which included removing columns that were too close to the edges of platforms.