(3 below) Images courtesy of ASC Industries/PYTHON America Te 1WTC tower has over 3 million
square feet of office space with several signed leases including one with the prominent New York-based publisher Condé Nast. In addition to office space, the tower will also serve as a tool for radio and television transmission providing broadcasting services similar to that of the Empire State Building. By the time the tower is finished, it will have cost well over $3 billion to construct. Te 9/11 memorial is located near the tower that has a list of each victim immortalized there. An observation deck is provided for tourists to gain an elevated view of Manhattan from its southern location. Te 1WTC was also designed with cutting-edge green architectural features. Te air quality for the tenants is high quality filtered air. 90% of the occupied spaces use natural lighting to lift morale and to reduce energy costs. Te high performance glass curtain wall is highly insulated glass. Each floor has the ability to control the heating and cooling temperature for the particular tenants occupying the space. Te tower also boasts of architectural features such as a 54-foot high entrance lobby, spaces with a minimum of 9 feet floor to ceiling sizes, and floor designs that do not have columns to interrupt flexible office and furniture designs. Addressing safety concerns, the 1WTC
tower has a special steel and concrete base designed in accordance with the New
York Police and Fire Departments. Te elevator shafts are constructed with high strength block and grout. Likewise, the new transportation hub was strategically designed to protect the area from attack. Most of all, the soon-to-be Freedom Tower symbolizes America’s resilient strength, beautiful creativity, and engineering innovation.
THE STEEL CONSTRUCTION
PROCESS Te Bilco Group and ASC Industries/ PYTHON America supplied PYTHON High-Performance wire rope for the cranes that sat on the tower as it grew upwards floor by floor. Two cranes were devoted to steel construction and the other to concrete. Te towers were constructed in such a way that once the steel arrived to the site, the ironworkers attached the load to a crane’s hook with steel “choker” cables. Ten, another group of ironworkers would handle and guide the steel bundles into place, securing the steel temporarily with tapered drift pins shoved through the matching bolt holes of the pieces to be connected. Te choker cables were then released and the process started all over as the ironworkers replaced the pins with high-strength bolts. As steel was brought up to each new
level on the tower, large steel guide cables were secured from the columns to the floor below. Te steel guide cables were then released as beam connections were made between columns. Corrugated metal deck was then spread over the steel floor members and welded down. Once all of the steel connections were finished and all of the steel decking installed, the floors were given over to the concrete contractors to finish each composite flooring system.
THE TOWER’S
LEGENDARY ANTENNA SOM’s vision for the top of the Freedom Tower was a crowning sculpture designed by the famed sculptor Kenneth Snelson. Te sculpture was designed to sheath and work in conjunction with the communications platform ring and a 408-foot, cable-stayed antenna mast. When the project was recently near completion, Te Durst Organization
18 JANUARY-FEBRUARY 2013 WIRE ROPE EXCHANGE
who sought to reduce project costs deleted the antenna’s sculpture from the building. Still compelling for mention, the design
for the antenna had been a mast protected by a one-of-a kind fiberglass panel system that was designed to resist wind loading, and to create a protected maintenance area. At the base of the mast, a tetrahedral lattice ring supported the media transmission equipment. Te lattice ring braced eight radio-frequency transparent Kevlar guy cables that supported the mast. When lit at night, a beacon at the top was to send out a horizontal light beam that could have been seen from miles away. Te sculptor artist Kenneth Snelson’s
“art is concerned with nature in its primary aspect, the patterns of physical forces in three dimensional spaces.” Snelson’s work is ethereal and embodies complex
Joe Woolhead | Courtesy of Silverstein Properties
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84