Tall, taller, tallest – in New York's district of Manhattan work on a super-highrise is well under way. At 472 metres, the Central Park Tower will rank as the world's tallest residential building. It will take over as number one from 432 Park Avenue, also in New York City (NYC). The Central Park Tower will also be the second tallest building in the metropolis. Only One World Trade Center stands taller, at a roof height of 541.3 metres.
The Central Park Tower is sited close to the south-western corner of New York's famous Central Park and its views over the city and environs will be stunning. When completed, the tower will offer more than 111,500 m² of prime real-estate floorspace, most of which will be residential. Apart from its amazing height, the Central Park Tower is special in another way as well: for a building as tall as this it has relatively few floors, only 99 in all. This is because of the extraordinary ceiling heights of the ground floor space, which is reserved for the flagship store of US department-store and mail-order company Nordstrom.
Forming quickly and in safety
The steel and concrete structure is complex, the room heights are unusual and the concrete core advances ahead of the floor slabs, a feature uncommon in construction of skyscrapers in NYC. These are some of the biggest challenges involved in building the Central Park Tower. Furthermore, lead contractor Lend Lease insists on the highest levels of site safety on all its construction projects.
Doka and Pinnacle Industries have been working together for a long time. So the builders are well aware that they can rely on Doka in all matters relating to safety. The self-climbing formwork and working platforms from Doka are the perfect solution for the Central Park Tower build. Super Climber SCP is the system for the core and Xclimb 60 climbs the exterior of the building's core up to the 12th floor where Doka’s Xclimb protection screen with Xbright mesh and solid panels climb the façade. The structures building method transitioned from Core ahead to Pouring down so the SCP was designed to adapt to safely place concrete with or without the structural slabs from the start. The speed and simplicity of the Super Climber SCP enable the crew to focus on other aspects of the project, such as the steel supports for connecting the steel girders of the skeleton to the core up to the 12th floor or approximately 90 meters. At the touch of a button, in a single lift the hydraulic system climbs the platform with all the formwork, the material containers, tools, workers rest area or shanty’s, and the concrete placing boom to the next concreting section. The Super Climber on this build has two suspended stair towers and two lower levels for a total of 4 total levels of working, access and storage platforms. Pinnacle Industries also worked out a comprehensive safety program establishing a firm culture of safety. Regarding cooperation, Doka's outstanding technical know-how, the services and the systems were the crunch factors in Pinnacle Industries' considerations.
The Super Climber is a perfect example of a formwork system that belongs among the most technologically advanced on the market. The system is efficient, easy to operate, and fast. In combination with Doka's preassembly, engineering services and site support, this allowed that the project had only a short lead-in time and has progressed smoothly from day one.
"The Super Climber SCP is a great system. But it's not just the formwork engineering from Doka that's so good, it's also the support and the engineering services. Everyone is really helpful. Doka is always right there when you need something", says Justin Meyer, a General Carpenter foreman for Pinnacle Industries on this build.
Project: Central Park Tower (former name: Nordstrom Tower)
Location: 217 West 57th Street, Manhattan, New York City
Type of structure: Residential highrise
Architecture: Adrian Smith + Gordon Gill Architecture
Developer: Extell Development
General contractors: Lend Lease
Construction work by: Pinnacle Industries
Height: 472 m
Gross usable floor area: 111,500 m²
Scheduled completion: 2020
Doka formwork technology used:
Core: Automatic climbing formwork Super Climber SCP
Façade: 62 brackets of the Automatic climbing formwork Xclimb 60, Folding platform K, Large-area formwork Top 50, Framed formwork Frami Xlife.
Also: Protection screen Xbright, Xclimb 60 extending platform, table lifting system TLS, stair towers