Masonry Magazine November 2011 Page. 52
INDUSTRY NEWS
The interference with the curtain wall installation allows the building to be closed in earlier than in conventional configurations of the Hoists. In the case of One World Trade Center, the extreme height and concern for workers' safety were bringing an additional challenge to the traditional conception of the common tower.
Atlantic Hoisting and Scaffolding's team decided to abandon the conventional four-pole components generally used for the common tower, in lieu of actual Rack and Pinion tower sections at the four corners, giving them a means for adapting mechanical access equipment to perform the construction of the platform in a safe and efficient way. Atlantic Hoisting and Scaffolding's Todd Rego says he has reduced his labor during the construction process by 30 percent and finds the safety factor increased by an immeasurable amount. The common tower is, in all reality, a temporary building built alongside the permanent structure. It has wind load, capacity requirements per floor, and a fast-tracked construction timeline, much like the property under construction.
Thirteen RAXTAR Model RX3245 hoists have been placed throughout the two side-by-side projects. RAXTAR was open and receptive to the specific requests of Atlantic Hoisting and Scaffolding and their ideas to ensure a safe, productive artery to the project. Multiple RX3245SFT, 300 feet per minute, 7,000-lb. men and material hoists were designed with an overhead protection deck above the car for installer's protection from workers above them. The cars incorporated designs from the years of combined experience of Atlantic Hoisting and Scaffolding and RAXTAR engineers. A structural common tower platform" is an integral part of the configuration of the hoisting areas. A custom work platform designed specifically for the construction of the common tower structure was built by Hydro-Mobile and is in constant use as the project climbs at a pace of one floor per week. Since its installation in November 2009, the hoists run six days per week, moving 1300 to 1400 men and women to all the stops on its way to an overall height of 1776 feet, where the top floor will be denoted as the 82nd Floor.
It is expected that three additional years of use should be required before the project is completed. For more information, visit www.hydro-mobile.com/1WTC. IMAS
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November 2011 www.masoncontractors.org
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