The Mesabi Nugget plant, in the Mesabi Iron Ore Range in northeastern Minnesota, will be the first full-scale, high-grade iron nugget plant to be built. The construction project started in October, 2007 with the Rotary Hearth Furnace (RHF) building. This portion of the project was awarded to Oscar J. Boldt Construction located in Cloquet, MN. The RHF building consisted of a 33' wide circular footing with an inside radius of approximately 82' with two ring walls that sit on top spaced approximately 16' apart. Because of an environmental permit expiration date that was very close, the contractor was given just five days from the award of the project until they had to be on site, starting the foundation. Because of the unusually narrow time constraints, the contractor needed a forming system with a true radius very quickly. The Minneapolis-area Symons branch immediately shipped Alisply™ Circular forming system components to form the wide footing. To build the ring walls that sit on top of the footing, the contractor chose Flex-Form® panels, which were shipped to the site already set at the required radius so that the project could continue moving along quickly. Symons provided all of the forming and shoring systems for the RHF construction.
Steel-Ply® was used to form the equipment ramp walls and other structures. ShorFast™ supported the elevated slab over the equipment ramp and the discharge chamber. Hammerlund Construction from Grand Rapids, Minnesota has been awarded the contract to construct five buildings on this project. As a previous user of the Symons Alisply™forming system, Hammlund has selected it again on this project. The buildings they are constructing are a Raw Materials Preparation building, Pelletizing building, Warehouse, an Electrical Substation and a Product Cooling Tower. The ability to quickly reconfigure the Alisply system for each of these different structures has kept the project moving.
See video and more photos at http://www.steeldynamics.com/index.php?page_id=117
