First WOLFF in Manhattan
The powerful luffing crane is the first WOLFF crane in New York City and convinces with a compact design and modern drive technology.
Construction work on the 3 WTC already started back in 2010 with the building of the foundation and a part of the reinforced concrete inner core accommodating elevators, staircases and supply lines. The WOLFF 700 B US, equipped with a 55 m jib and an additional 5 m fly-jib, is expected to be in use until mid 2016, lifting steel columns and girders for the outer shell of the skyscraper. Although a standard construction method in modern high-rise construction, the WOLFFKRAN team was faced with the challenge of having to position the crane extremely close to inner core. With the construction of the core always several floors higher up than the outer shell, a crane with a very small tail swing was required in order for it to rotate freely.
The WOLFF 700 B US, already equipped with a very short counter jib, was therefore specially adapted for this project with an even shorter counter jib of 7.4 m. The WOLFF will rise with the building to a height of approximately 300 m by means of an internal climbing mechanism.
In addition to its compact construction, the customer opted for the WOLFF 700 B US because of its electric drives paired with high lifting capacities and working speeds. With safety and efficiency regulations for cranes having become considerably stricter in New York City in the recent past, contractors and rental equipment companies are more often opting for modern electric tower cranes rather than the conventional diesel-powered cranes.
The WOLFF 700 B US impressively proves that this does not affect the performance of the crane. With a lifting capacity of 48 t and a line speed of up to 190 m/min, it is ideally suited for the job on the 3 WTC site, where it has to lift tons of steel and prefabricated components up to 350 m. It is further equipped with a fly-jib lifting 7.25 t and a working speed of up to 140 m/min.
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