A Manitowoc 2250 crawler crane and a Grove GMK6250L all-terrain crane recently assisted in the construction of a two-story underground parking structure at a mixed-use apartment complex in Bloomington, Minnesota.
The cranes were rented from Vic's Crane and Heavy Haul by Hanson Structural Precast, the precast subcontractor working for general contractor Frana Companies. The two cranes lifted and placed the precast concrete wall panels and flooring sections. The heaviest load, a 60 foot "double T" floor section, weighed 65,000 pounds. The load-bearing walls each weighed 38,000 pounds.
"The 2250 was a great fit for our jobsite," said Tim Harty, vice president of Vic's Crane & Heavy Haul. "Between the sandy ground and space constraints of the below-grade site, we only had a small runway of space to assemble the crane. The crane had to be 105 feet from where we placed the concrete sections. As a result, we needed a crane with ample reach and capacity."
Vic's first used the GMK6250L all-terrain crane to place the precast wall sections. The sections were taken directly from the trucks and placed into position as load-bearing walls. With the perimeter walls complete, the Manitowoc 2250 was used to place the heavier flooring slabs and the interior walls. To ensure the trucks could access the jobsite while keeping the crane on steady ground, the 2250 was assembled with Series 3 counterweights and 210 feet of main boom.
Both cranes remained on the jobsite for one month. The Grove 6250L will also return to work on the structural steel of the eight story apartment structure above the parking ramp.