Precast Solutions - January/February 2008 - (Page 17)

COMCAST CENTER PROJECT Project Use: Tuned Liquid Column Damper Project Location: Philadelphia, Pennsylvania less than seven weeks to finish. Erection of the panels at the site was completed two weeks after that. The cost benefits of precast in this situation are numerous. Precast was first considered because of the The purpose of a TLCD (tuned liquid column damper) is to counteract the swaying of skyscrapers such as the Comcast Building in Philadelphia, the 13th tallest building in the United States. It accomplishes this by tuning a body of water to "slosh" in sequence with the swaying of the building. This is the largest TLCD in the world and perhaps the first using precast panels. Overall, 82 tons of rebar and 450 yards of concrete were used. Production started April 2, 2007, and took time of year that cast-in-place concrete was anticipated, which was in the winter of 2007. Secondly, there was the enormous cost of forming and pouring such a huge tank 975 feet in the air. Lastly, precast presented what it always does as the winning edge: speed and quality. Although the cost of the precast panels exceeded $1 million, it was nominal compared with the total cost of the TLCD and less than 0.2 percent of the $540 million cost of the entire building. With a potential $500,000 loss of weekly rental income, the general contractor was ecstatic to have this part of the project come in ahead of schedule. The panels were erected during the evening hours using a crane mounted on top of the building. A team of welders then attached the weld plates during the day so the panels would be ready for more "lifts" the following evening. Overall, there were just a few days of lost erection time due to high winds. Considering the cost of embedments and welders, precast was still very competitive with cast-in-place construction – and with the advantage of speed. THIRD PLACE TIE ABOVE GROUND COMPANY PROFILE: Modern Precast Concrete Inc. P.O. Box 339 Ottsville, PA 18942 (610) 847-5112 www.modernprecast.com JAN/FEB 2008 | PRECAST SOLUTIONS 17 http://www.modernprecast.com

Table of Contents Feed for the Digital Edition of Precast Solutions - January/February 2008

Precast Solutions - January/February 2008 Contents Precast Concrete Short-Span Bridges Precast Micro-Reinforced Concrete A Winning Edge The Creative Edge TMI: Too Much Infiltration! Architectural Details Cast in Stone

Precast Solutions - January/February 2008

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.