A major project to replace the Commonwealth Avenue Bridge is underway in Boston. This morning I walked over to the construction site and watched for a good 30 minutes. It was amazing. To facilitate the work, a large number of adjacent streets and bridges have been closed to the combined 56,000 daily car and train commuters. These closures have spawned dozens of sub projects designed to take advantage of the suspended traffic. After a few minutes of observation I was able to identify the small group of workers from the crew of 200 that were actually working on the bridge replacement. In the course of 20 minutes I watch three guys install a massive steel I-beam across the highway. One guy operated a 440 ton crane while the other two secured the 150 foot, 45 ton beam to the end of its hoist cable. They then moved the beam from the flat bed truck on which it arrived to its anchoring foundations with a level of speed and accuracy that I would not have thought possible. The project will use a total of 44 steel girders, 267 concrete deck panels and a fleet of 5 cranes to install them. The staging and choreography of equipment and materials is nothing short of incredible. After the Big Dig fiasco, I would not have thought it possible for Boston planners and worker to execute such a massive project so well.
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