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Steel Shots: Reusable Falsework
Posted by Tom Klemens on January 28, 2011 at 9:30 AM.


Much like launching a boat, four synchronized hydraulic jacks ease a section of framework for the new Marlins Ballpark retractable roof down ramps and off of the four 200-ft-tall falsework towers upon which it was assembled. In this photo, from the January 14 launch of the third section, the trusses had traveled just more than halfway down the ramps. Erection of the next set of trusses began immediately on those same towers.


The three-section retractable roof now being erected at the new Marlins Ballpark in Miami is a marvel of technology, all the way from its design and conception through its erection and on to its eventual operation. The finished product will be remarkable enough, but the method being used to erect the huge movable structure is an innovation worth noting.



The novel erection and shoring removal plan was developed for the project by AISC-member LPR Construction Company, Loveland, Colo. The steel is being fabricated off site and almost all of it is being delivered as individual pieces. The LPR crew is erecting those pieces into five bridge-like truss structures, one at a time, on a set of four shoring towers in the range of 200 ft tall. Each end of the structure is attached to and supported by a Uni-Systems transport unit. Once the span is completed, the assembly is eased down inclined ramps atop the shoring towers until it’s fully supported by just the transport units and free of the shores.


At that point, the assembly is wheeled down the tracks allowing erection of the next truss to begin on the shores while ironworkers attach the remaining steel to the launched structure.


Structural engineering for the Populous design was done by Walter P Moore. Fabricator on the project was AISC-member Canam/Structal.


marlins_jan2011-070_webcam-x.jpgThe project and the erection process will be the subject of an MSC article later this year.


For more information, visit the Marlins homepage by clicking here.


Check out the construction from high above center field with the ballpark’s interior webcam by clicking here.

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