In the fall of 2011, the Green Bay Packers began a two-year expansion project to increase the Lambeau Field outdoor stadium’s seating capacity and improve the overall fan experience. The expansion includes approximately 6,700 new seats in the South End Zone, a new viewing deck atop the North End Zone, enhanced entryways and stadium access and two giant new video boards in both end zones. Miron Construction Co., Inc., Neenah, WI, served as the construction manager for the project.
The North End Zone construction revolved around the addition of a massive shaft for six new elevators, the new party deck that sits on top of the stadium roof and the new Mitsubishi Diamond Vision Video Board. The work in the South End Zone was even more extensive. To support the structures for the new video board and seating, an additional bay was added to the existing bowl and seven new levels were built on top of the existing three levels. This required major reinforcement of the existing steel columns.
Steel Reinforcements Call for Extensive Welding
Column reinforcement included enhancing the base plates at the footings and adding plating and bar stock to the three levels of existing columns. Enhancing the bases involved adding 2-in. plate steel to the existing base. Steel plating 2.5 in. thick was added to some columns, while bar stock (2.5” x 2.5” and 5” x 5”) was added to others.
With this came the need for extensive welding, as well as the ability to run a variety of ancillary tools such as grinders, lights and fume extractors. Engine-driven welder/generators were used extensively in these applications to provide both welding and power capabilities.
Stick welding was used primarily throughout the site, although a number of ironworkers were also trained on and transitioned over to flux-cored welding. The engine-driven welder/generators were primarily used for Stick welding, using 1/8-in. 7018 Stick electrodes to perform the extensive reinforcement on the columns.
One of the tools used on the project was the new Trailblazer 325 EFI with Excel Power, which is rated at 325 amps at 100% duty cycle for Stick welding and 10 to 35 volts of MIG and flux-cored welding power. EFI (electronic fuel injection) optimizes the air/fuel ratio for reduced fuel consumption, longer runtimes and fewer emissions. It also provides more reliable starting performance in cold welding environments.
“Older engine drives with carburetors and chokes always had a hard time with the chokes freezing up in the winter,” says Jake Wirkuty, an ironworker with Miron Construction. “It seems with this electronic fuel injection, you can just switch over and it starts perfectly.”
Significant Fuel Savings
The new Trailblazer models include Auto-Speed technology and Excel Power technologies. These technologies, combined with EFI, can reduce fuel use by as much as 35% and nearly double runtimes.
Auto-Speed technology automatically adjusts the engine speed to run at lower speeds determined by the load applied to the machine. Excel Power is used to run jobsite power tools, providing 2,400 watts of pure 120-volt, 60-Hz generator power that is completely separate from the machine’s standard generator power (12,000 watts peak, 10,500 watts continuous). Since it is separate, workers with Miron Construction were able to plug in power tools and run those at idle speeds of 2,400 rpm.
“It’s been easy to set up, and fuel consumption compared to the older Trailblazers — I bet you cut fuel in half,” says Wirkuty. “That means you spend less time filling up machines and less time having guys run to get fuel.”
By working at a lower rpm, the machines also reduce engine noise by as much as 68%. “The reduced noise on the machine is a lot better for the guy sitting next to it,” says Wirkuty. “The [welder operator] seems to weld better, you don’t have to put up with that noise all day, the people around you don’t have to put up with that noise all day. And being able to reduce noise was especially important if you were working toward the offices or other areas where people were still working.”