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Major Pieces Go Up At SF Events Center

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It's been nearly two years since the citizens of sioux falls voted to build an events center. Now it's taking shape. One of the last major pieces of the Denny Sanford PREMIER Center's steel infrastructure is set in place.

Mortenson Construction Superintendent Brian Boe said, "You're seeing this building as we've been calling it, the bowl, actually take shape."

When it's all said and done, it will take six trusses to support the roof of the 302,000 square foot building.

Boe said, "There's a lot of engineering that's involved with how do you keep this 270 foot long truss stable while you erect the other stuff to it."

So how do you lift something that measures 30 feet tall, weighs 100 tons and secure it 105 feet in the air? One of the pieces is erected on the ground inside the events center, the other on the outside. Two huge cranes then lift them into place.

"Each crane picks up a different piece, so what we do is called a mid-air splice. So you pick up one piece and you pick up the smaller one and then the crew bolts it together," Boe said.

The first truss took 16 hours to construct as Mortenson Construction says it's something they've never done before.

"Following that is a whole slew of additional steel, cabling, bracing, all engineered stuff to safely release the load from the crane," said Boe.
But as each one is lifted, the work begins to flow.

Boe said, "The last two have been by the time we could release the crane, it's been four to five hours."

Only two more trusses to go until the roof goes up and that much closer to getting the project done.

Crews will begin work on the fifth truss Saturday. All the trusses should be in place by the first week of September.

Crews say so far all of the work has been completed on time. The events center is set to open in the fall of 2014.
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