mark, the Vesconite structural engineer who was involved in the project. “That is why Vesconite Superlube could be used very effectively here. The benefit is very low fric-tion with wear resistance that is much bet - ter than PTFE,” he says. Another benefit of implementing Vesconite Superlube in this applica - tion was that a smaller bearing could be used, taking advantage of Vesconite Superlube's high load-carrying capacity. “If there is a space constraint, that is helpful to an engineer,” Utermark notes.
4. Epoxy bedding compound was placed on to the stainless steel top and bottom coverings of the Vesconite Superlube
bearing to create a level bearing surface. Vesconite Superlube in structural design
In structural design, vertical load is considered as well as horizontal load. These two loads are used to determine the required column base- strength and the amount of steel and concrete. If there is a bearing on top of the column, the horizontal force that needs to be taken into account depends on the amount of friction at the top of the column. If you have a lower-friction bearing, then an engineer can design for a lower lateral force, which means less steel and concrete is needed for the column. “You want those lateral forces to be minimised,” notes Thomas Uter-
Transforming Healthcare Centene Corporation, a leading multi-national healthcare enterprise, is establishing an East Coast headquarters in Charlotte, North Carolina. The 80-acre campus will accommodate 6,000 employees and will be comprised of one million square feet of office and meeting space, a corporate boardroom, childcare, dining, and a fitness center. A condensed 32-week concrete construction timeline and complex cantilever designs presented a wide array of challenges to construction crews charged with erecting the building. The team turned to PERI USA to deliver a custom-engineered formwork and shoring system on a tight turnaround that would keep them safe and on schedule for Phase 1, including the East tower and parking garage. Critical Support The building design featured cantilevers extending up to 60 feet off the main building without self-support until all floors were constructed. To provide backshoring support on the cantilever, PERI provided a custom solution to support six building floors using Heavy Duty VST Shoring towers until permanent angled metal support beams could be installed. PD5 shoring towers supported the tallest, 30-foot cantilevers. PD5 achieves a high load-bearing capacity 10,000 pounds per leg, even Centene Corporation East Coast Headquarters Charlotte, NC
when extended to a maximum height of 32 feet. Assembly, disman - tling, and transport of the system can be easily done by crane or trolley, and the continuous adjustment makes it applicable for all possibilities. VARIOKIT VST Heavy-Duty Shoring Towers were selected to with- stand the full backshoring loads of 1.5 million pounds on one single tower – a solution requiring a highly technical design and coordina- tion. VST serves as shoring for projects requiring the central transfer of large loads and can be quickly assembled as towers, main beams, or birdcage scaffolding. For the smaller cantilevers, HD 200 Heavy-Duty Props provided backshoring while SKYTABLE slab tables were stripped and flown to the next level in just 10 minutes without moving the props. HD 200 is PERI’s lightweight, stackable prop system comprised of individual prop sections with easy handling, assembly by hand, and flexible ap -
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csengineermag.com
DECEMBER 2021
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