Keeping Communities Connected and Commerce Flowing

Keeping Communities Connected and Commerce Flowing 

From Virginia to Florida, America’s tunnels are vital links in our transportation network—connecting communities and supporting commerce. The Monitor-Merrimac Memorial Bridge-Tunnel in Virginia and the Port of Miami Tunnel in Florida are prime examples of how the use of long-lasting concrete, diamond grinding and concrete pavement restoration (CPR) techniques ensures these structures will remain operational for decades. 

Monitor-Merrimac Memorial Bridge-Tunnel

Spanning 4.6 miles, the Monitor-Merrimac Memorial Bridge-Tunnel connects the cities of Newport News, Suffolk and Chesapeake, Virginia. Opened in 1992, the tunnel was constructed using prefabricated concrete and steel segments, which were floated into position, sunk into a dredged trench and joined underwater. 

Over time, joints in the roadway and retaining walls began to leak seawater and silt. In 2019, the Virginia Department of Transportation (VDOT) addressed these issues with partial-depth repairs, polyurethane injection resins and repaving. These efforts have ensured the tunnel remains a reliable and safe route for commuters and freight.

Port of Miami Tunnel, Florida 

The Port of Miami Tunnel, opened in 2014, connects PortMiami on Dodge Island with the MacArthur Causeway, providing direct access to the interstate system. This twin-tube, 4,200-foot tunnel reduces truck traffic in downtown Miami, easing congestion and improving air quality. In addition, by facilitating the movement of cruise ship passengers and freight, the Port of Miami Tunnel plays a critical role in supporting Florida’s economy and global trade. 

During construction, the tunnel’s concrete pavement was diamond ground to create a smooth surface, enhancing ride quality and skid resistance. Additionally, 200,000 cubic meters of concrete grout were injected to stabilize the ground, allowing the tunnel boring machine to continue its work. 

By prioritizing ride quality, safety and longevity through the use of techniques like diamond grinding and partial-depth repairs, these tunnels will endure for many years to come. 

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