Steve P. Rados, Inc., the tunnel project contractor, completed excavation of 16 of the 48 piles. The sequenced construction of overlapped and reinforced concrete piles will form the walls of the tunnel shaft for the micro-tunnel boring machine. Each pile is filled with 17 cubic yards of concrete to create water tight walls for the shaft. The large drill used to perform the necessary excavation weighs 200,000lbs and can reach heights of nearly 80ft. With its massive size and weight it allows the Contractor to drill through the solid bedrock.
200,000lbs Drill ring excavating the 16th pile.
Crews use water to minimize dust and assist in excavation.