Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

426 Chapter Fifteen
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FIGURE 15-10 CN Tower in Toronto, Canada: 1,815 ft total height, 1,476 ft
slipform height.
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Another example of the application of slipforming towers is the
CN Tower in Toronto, Canada (Figure 15-10). At a total height of 1,815 ft,
it is the world’s tallest freestanding structure and holds the record as
the tallest structure that has been built by the slipform method of
construction, 1,476 ft of slipforming. The slipform was specially
designed to be continuously adjustable during upward movement to
achieve the graceful taper of the tower’s triangular pedestal.
Concrete Buildings
Figure 15-11 illustrates the use of slipforms to construct the elevator
and stair core of the ARCO II building in Denver, Colorado. This
45-story structure rose to a height of 544 ft in 50 working days. Unlike
other slipformed structures, buildings are usually not slipformed on
a continuous 24 hour per day schedule. Instead, the slipforms are
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