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Updates on Current Projects

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This is an excerpt from an article that appeared on ENR Southeast Blog on 8/2/2012

The $1-billion Port of Miami tunnel project, one of the nation’s more notable infrastructure contracts, experienced a literal “breakthrough” moment July 31, as crews leading the 380 ft-long tunnel boring machine completed the first of two “tunnel tubes” under Biscayne Bay.

Two 4,200-ft-long, 43-ft-dia tunnels will connect the port on Dodge Island with nearby Interstate 395. The tunnel boring crews broke through onto Dodge Island, from their starting position on nearby Watson Island. They will now disassemble and then re-assemble the TBM—nicknamed Harriet—and head back to Watson Island.

The tunnel is estimated to be the largest soft-ground tunnel in the U.S., running approximately 120 ft under the channel at its deepest point. The $45-million TBM was custom engineered and fabricated by Herrenknecht in Germany.

As Engineering News Record Southeast reported previously, the project is the result of a $1-billion design-build-finance-operate-maintain contract between the Florida Dept. of Transportation and Miami Access Tunnel, a partnership between Bouygues Travaux Publics of France and Meridiam Infrastructure, Luxembourg.

Finally, here’s a photo from the “breakthrough” celebration showing construction crews cheering—a pretty nice sight to see these days. Here’s hoping they’ll have more to celebrate soon!

TBM crews celebrate their "breakout" moment. (Photo Courtesy of Bouygues Civil Works Florida)


CUTTING HEAD of TUNNEL BORING MACHING – 42 feet high, ½ billion pounds &
millions of dollars of steel – being PUT INTO PLACE.
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