Cianbro
Baltimore, MD 21226
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Sarah Mildred Long Bridge Replacement
Project Information
- Project Location:
- Kittery, ME
- Status:
- Completed - Jan 2018
- Structure Type:
- Bridge
Scope Of Work
As the Construction Manager/General Contractor (CM/GC), Cianbro constructed and replaced the Sarah Mildred Long Bridge located on the Piscataqua River. The existing steel vertical-lift bridge carries the U.S. Route 1 Bypass, providing a critical link between Kittery, Maine, and Portsmouth, New Hampshire. The new 2,800-foot concrete vertical-lift bridge was constructed at a higher elevation than the existing, with a vehicular structure stacked over a railroad level, as well as a longer lift span at 300 feet. Other differing characteristics include long open spans, fewer piers, and wider shoulders.
Project Details
Removed existing structures
Constructed concrete roadway and railroad superstructures
Constructed a high-quality and reliable 4,000,000 pound 300-foot long steel lift span
Constructed four angular lift span towers
Avoided and minimized project impacts to the roadway, railway, and maritime traffic; local businesses; and communities during construction
Erected 500 precast concrete segments, including 126 precast railroad segments, 229 precast vehicular segments, and 88 precast tower segments
Installed four 20 foot-diameter, 100-ton counterweight sheaves
Installed 29 drilled shafts, composed of 8,000 yards of concrete and 3,000,000 pounds of rebar
An additional 20,000 yards of concrete containing over 2,500,000 pounds of rebar were cast-in-place on the project
Over 300 miles of post-tensioning strand was installed, tensioned and encased in nearly 12,000 bags of "cable" grout
Over 200 team members on site at the project's peak
Managed environmental time of year restrictions, in water work windows, hydroacoustic and turbidity monitoring
Lean, Innovative, and Unique Project Solutions
As a member of the Integrated Project Team (IPT), Cianbro worked collaboratively with the Maine and New Hampshire Departments of Transportation as well as Figg Engineering and Hardesty & Hanover, on New England’s first CM/GC alternative delivery bridge project. Cianbro maximized the benefits of the CM/GC process by focusing on the design and construction approach to enhance safety, improve schedule, and increase project value while adhering to the budgetary goals.
Awards
2019 AGC Build Maine Award
2019 PTI Award of Excellence