Project Team’s Innovative Design and Focus on Detail Ensures Smooth Project

In 2012, Dominion rebuilt their 115kV transmission line that crosses the five-mile-wide Albemarle Sound in North Carolina. Originally constructed in 1963, this rebuild provided a much-needed upgrade to help deliver reliable power along the existing line. The unique challenge for this project, which included approximately 34 miles of new transmission line and support structures, was the design of the connections between the pile caps and the piles to meet the fabrication and installation tolerances specified for the project. GAI’s role was to design the 24 foundations located in the waterway, which consisted of precast concrete pile caps and prestressed cylinder piles.

The innovative solutions implemented into the design included the use of self-consolidating concrete to bond the piles to the reinforcing steel cages that projected out of the pile cap. Adding to the complexity was the need to use heavy lifts from a barge-mounted crane to install the pile caps throughout the project.

The unique challenge for this project, which included approximately 34 miles of new transmission line and support structures, was the design of the connections between the pile caps and the piles to meet the fabrication and installation tolerances specified for the project.

The August 2015 edition of T&D World Magazine (Lines & Structures), contains an article, written by GAI Senior Engineering Manager Jason Truckenbrod, entitled “How to Handle Offshore Foundations,” which describes the details and challenges of this unique project. Jason also presented a discussion on this project, together with Assistant Vice President Steve Miller, PE and Engineering Director Bruce Roth, PE, at the 2015 ASCE-ETS Conference in Branson, Missouri.

For more information about the Albemarle Sound project or GAI’s Power Delivery and Structures services, contact Jason Truckenbrod, PE at 724.772.2011 or Steve Miller, PE at 412.476.2000.

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