Post Content

93Fast14_500_Wide
MassDOT's "93Fast14" project achieved an historic success this weekend as work crews erected the final of 14 prefabricated bridge superstructures on I-93 in Medford.  The 14 deteriorated bridges that carry Interstate 93 over seven local roads in Medford have been replaced at a rate of at least one bridge per weekend this summer.  In every case, the work was completed and all roads reopened several hours ahead of schedule, well in advance of the Monday morning commute.

Federal Highway Administrator Victor Mendez called the 93Fast14 project the most ambitious bridge project in the country.  The project under normal circumstances would require at least 4 years of construction and lane closures.  MassDOT used cutting-edge techniques to safely complete the project much more quickly, including:

•    Design/Build: one joint venture team (J.F. White/Kiewit) is responsible for both design and construction.
•    Pre-fabricated bridge element system (PBES): a total of 252 prefabricated panels made of two steel I-beams with a concrete deck replace the old superstructures. They are prefabricated in a controlled, factory setting which results in high-quality concrete.  Once at the construction site, they are lifted into place using cranes.
•    Special “closure pour” concrete mix: This project uses a special rapid-set concrete for the “closure pours”— areas of poured concrete which connect the prefabricated panels.
•    “Zipper Lane” crossover: provides a safe work zone for drivers and workers and allows for the bridge demolition and replacement to occur in just 55 hours (or less).

The $98.1 million project to replace the fourteen bridge superstructures in Medford is funded through the Patrick-Murray Administration’s historic Accelerated Bridge Program, a $3 billion recovery effort to reduce the Commonwealth’s backlog of structurally-deficient bridges.

Completing the final superstructure erection this weekend is a major milestone for the project team, but work will continue.  During the last two weekends of August, MassDOT will perform weekend work requiring lane restrictions. Construction activities will also continue to occur during off-peak hours during weekdays and weekends after August.

For more information on the project, visit the 93Fast14 website.

Written By:

Recent Posts

South Coast Rail: Project of the Year Candidate posted on Oct 24

South Coast Rail: Project of the Year Candidate

The South Coast Rail project will be under consideration for the North American Project of the Year, specifically for job creation, at next week’s North American Strategic Infrastructure Leadership Forum in Washington, D.C.  The forum is hosted by the globally recognized firm CG/LA Infrastructure.  Aconex,   …Continue Reading South Coast Rail: Project of the Year Candidate

MBTA: Green Line Real-Time Tracking posted on Oct 23

MBTA: Green Line Real-Time Tracking

Today, the MBTA will begin providing real-time information on the Green Line for the first time in the line’s 117 year history. Real-time data on the location of Green Line trains will be fed to the dozens of MBTA real-time apps. This will mark the   …Continue Reading MBTA: Green Line Real-Time Tracking

RMV: Know Your Teen Driver Safety Facts posted on Oct 23

RMV: Know Your Teen Driver Safety Facts

The Registry of Motor Vehicles during National Teen Driver Safety Week reminds us that motor vehicle crashes are the #1 killer of teens. Parental involvement can help reverse that trend. Know the facts: 1. Parental Involvement Did you know? Parents who set, monitor, and enforce   …Continue Reading RMV: Know Your Teen Driver Safety Facts