FEA TURE — M ARLINS P ARK
Aerial view of the new Marlins Park.
IMAGE: ROD MAR/MARLINS MARLINS’ MIAMI MIRACLE
enterprise subcontractors, and used local businesses for supplies as much as possible. We coordinated daily with the architect and subcontractors, with a three-week look ahead for all involved to minimise any conflicts.”
Delano continued: “We managed the ballpark as two
separate projects: the track beams had to be installed to hold the roof prior to building the seating bowl; and then the roof structure went on (where we worked closely with Walter P Moore). This meant very tight scheduling for the delivery of materials into the laydown yard — as materials came in we were putting them in place very quickly. “When we constructed the track beams, we formed them on the ground and used strand jacks to lift the 2mm to 3.2mm-pound beams 150ft up into place. We built a scaffolding system on the west side to install all the retractable roof steel. Once we got each truss system built, we would move the truss system on the transport- ers over the playing field to its final connection to the steel, and then install the decking and roof membrane. For the operable glass walls on the east side, the panels were built by Industrial Door, and Crown-Corr did the majority of the exterior skin. “Overall, great teamwork and a tight workspace kept
the project on time and on budget. The Gold LEED certi- fication was a true reflection of the contributions from all our subcontractors.”
Raising the Roof! “This was our sixth sports venue retractable roof project with Uni-Systems, so we were very comfortable working with them,” Aaron White, Principal with Walter P Moore, told PanStadia. “We initially worked on the project in
20 th AN N I V ER S AR Y P AR T II/ S U M M ER 1 2
2004/2005 and were halfway through construction doc- uments when the project was stopped. It was renewed in June 2008 and the architect and owner had selected the site with the final orientation of the playing field. “The site lent itself to a three-panel retractable roof.
The ballpark was to be used 81 times a year for baseball, plus playoff games, but the owner wanted to use the roof as sunshade during the day to reduce the heat gain of the bowl. This was more efficient for heat energy, with the roof being open the majority of the time for less use of air conditioning. The roof becomes a giant shade over the West Plaza for pre — and post-game festivities, with a large video screen.” In relation to the working relationship between all
design team members, contractors and sub-contractors, White commented: “The job went very smoothly thanks to very good communication with all the engineers. We really didn’t have an issue on this project. A lot of this was good teamwork between fabricator Structal and erector LPR from Denver, and of course the Uni-Systems team for the mechanisation.” The retractable roof consists of three metal decked
operable panels: one upper and two lower panels. The east and west panels are at a lower elevation over the stands and the centre panel is at the highest elevation, with 216ft clear over second base. The roof mechanisa- tion system is supported by two horizontal concrete track beams approximately 548ft apart and 750ft long. When open, the centre panel retracts to the west main entrance plaza, and the east and west panels retract underneath the centre panel. The challenge is to move a combined 19 million pounds within 13 to 15 minutes,
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