43
RIGGING
SITE REPORT
JULY 2013
ACT
moment
Twin-path slings were fabricated by
ASC industries, a Slingmax fabricator,
and could lift capacities up to 250,000
pounds.”
Rigged to the top section of the spire
was an American flag, one of many
patriotic acts associated with this project.
Once the top spire section was bolted
in place, workers on top of the building
cheered, celebrated and even dried
Rigging specifics
■
The Favco tower canes supplied by J. F. Lomma Inc. were rigged with high strength ropes
designed and specified using Python Wire Rope and made in Germany.
■
Hoist ropes were both 32 mm and 42 mm using the Python Compac 35 2160 RLL. The
hoist ropes were a true non-rotating construction that stabilized the loads as they were
lifted several thousand feet in the air.
■
The luffing boom rope was a construction of a fatigue-resistant, eight-strand compacted
rope with a plastic coated core which helps prevent inner wire breaking and a permanent
lubrication.
■
Twin Path High Performance slings provided a light-weight sling that was 1/10th weight of
a wire rope sling and yet had the high capacities to make the lifts.
The final spire section was lifted to the roof
of the building on May 2 and was erected to
its final height on May 10.
their eyes, as did millions of Americans
watching it unfold on live television.
Soon after the spectacle of the spire
erection, the tower cranes will be taken
down. Lomma says the first crane will be
taken down by second one, and then the
second one will be taken down in August
using a specially designed derrick winch
from Timberland.
Below the Freedom Tower is a memorial
to the almost 3,000 people who were
killed when terrorists flew hi-jacked
commercial airliners into the World
Trade Center’s twin towers, causing their
collapse.
When complete, One World Trade
Center will encompass 2.6 million square
feet of commercial office space, and will
include observation decks, restaurants
and other public facilities.
■
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