Route 9 and Cedar Street were quietly reopened to traffic on Monday morning, almost twelve hours before they were scheduled to be open. A few onlookers watched as some of the first cars travelled under Route 9, and a few drivers sounded their horns and waved appreciatively at the workers. Onlookers stopped by the site throughout the weekend to watch the work rapidly progress. Over a hundred people stood by as the bridge moved—ahead of schedule— down Route 9.
The secret to the incredibly fast bridge replacement was the strategy used by MassDOT and its engineers and builders, which was aimed firmly on a single goal: to provide the best possible customer service to road users and the community by building a long-lasting bridge, safely, efficiently, economically, and with the least possible impact to traffic and the community. To accomplish that, MassDOT pre-constructed the replacement bridge superstructure in a cloverleaf near the old bridge. Doing so kept a vast majority of the work outside of the roadway, nearly eliminating traffic impacts to Route 9.
As shown in the short movie below, once the new bridge superstructure was ready, MassDOT needed to demolish the old bridge and install new portions of the center pier and abutments. On Sunday morning, all preparations were complete. At 5:00 AM, four multi-axle machines called Self-Propelled Modular Transporters (or SPMTs) rumbled to life from their position underneath the new bridge superstructure. They moved in unison, carrying the 530-ton bridge from the cloverleaf onto the Cedar Street ramp. Then, at 8:15, the SPMTs’ many wheels rotated 90 degrees, and the bridge moved smoothly down the ramp onto Route 9 as the crowd watched, amazed. The wheels rotated again, and the bridge moved down Route 9, arriving at the pier and abutments at 9:30. The SPMTs held the bridge above the substructure until the early afternoon, when it was lowered into place.
Crews worked throughout the night to prepare to reopen the bridge. Temporary lane markings are in place and one sidewalk is open for pedestrians. Crews will continue to put the finishing touches on the bridge throughout the month, during off-peak hours. This work includes installing architectural pilasters, final paving and lane marking, completion of sidewalks, and installing signs.
Cambridge: Kendall Square Mobility Task Force posted on Apr 17
The first meeting of MassDOT’s Kendall Square Mobility Task Force is scheduled as follows: Tuesday, April 28, 2015 from 4:00 PM – 6:00 PM at 600 Technology Square (corner of Main and Portland) – 3rd floor in Cambridge. MassDOT’s Kendall Square Mobility Task Force process …Continue Reading Cambridge: Kendall Square Mobility Task Force
MassDOT Receives Excellence in Transportation Award posted on Apr 16
The Massachusetts Department of Transportation (MassDOT) was recognized this week with an Excellence in Transportation Demand Management Award at the Association for Commuter Transportation’s (ACT) Regional Patriot Chapter Conference in Newport, Rhode Island. MassDOT was presented with an award for their Safe Streets Smart Trips …Continue Reading MassDOT Receives Excellence in Transportation Award
MassDOT Approves Contract for Springfield I-91 Viaduct Project posted on Apr 15
MassDOT today awarded a contract for the rehabilitation of the I-91 viaduct structure in Springfield. The lowest responsible bid was submitted by the joint venture of JF White-Schiavone, $148,000,150. There were three bids in total. The total project cost of $183,325,172 includes railroad flaggers, traffic …Continue Reading MassDOT Approves Contract for Springfield I-91 Viaduct Project