NW 25TH STREET VIADUCT
Contract Type: Conventional Bid/ Design-Build
Contract Amount: $124 million
Location: Miami-Dade County, Florida
Client: FDOT District Six
Design Partner: New Millenium Design Consultants, Inc.
Completed: July 2011
The project was completed 126 days ahead of schedule, achieved a final Contractor Past Performance Rating (CPPR) of 106, and received the 2012 FTBA Best in Construction Award (Major Bridge).
The project includes a one-mile viaduct over NW 25th Street, DERM drainage canal and four active rail lines. It is a major bridge project and includes twin 28-span viaduct structures and two ramp bridges. Design-Build specifications were implemented after the de Moya Group submitted a value added proposal to the Department to bring the project under the maximum bid price.
- Work included 130 individual deck pours over the 67 bridge spans.
- Complex bridge construction with a combination of concrete pier caps and structural steel straddle caps with weights up to 400,000 lbs.
- Complex construction sequences to minimize impacts to traffic on NW 25th Street and railroad operations while building the massive structure overhead.
- Construction activities included MSE walls, straddle bents, piles and pile cap foundations, an anchored bulkhead wall, and 14-foot diameter culverts.
- The de Moya Group provided a proactive management team that resolved all constructability issues prior to affecting the project schedule.
- Required a total of 139 mass concrete pours.
- Existing utilities were avoided while building pile foundations, underground drainage system, water mains, force mains, and gravity sewer lines.
- Construction of seven large diameter culverts (up to 14 foot in diameter).
- The project received the 2011 ASCE Project of the Year Award (Miami-Dade County) and the 2012 FTBA Best in Construction Award (Major Bridge).