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

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Slipforms 425
three 8- by 9-ft hollow vertical cells. The middle section has plan
dimensions of 40 by 12 ft, with three 8- by 8-ft hollow vertical cells.
The top section consists of two 8- by 7-ft solid rectangular columns
constructed with slipforms. Two equal piers were constructed for the
bridge.
Towers
The Reunion Tower in Dallas, Texas, is shown in Figure 15-9. Formwork
for the tower consisted of three 14-ft-diameter elements around
a central 27-ft-diameter core, which was slipformed as one unit.
Three slipform decks, spaced 10 ft apart, were supported by horizontal
and vertical trusses and by diagonal cable bracing to tie the
three levels together. Crews working two shifts of about 9½ hours
averaged more than 10 ft of progress per day. On the best day, the
crew completed 18 ft of vertical height on the tower. The day shift
slipformed and the night shift stocked material. The crane delivered
steel and concrete to the top level, workers on the lower level
received and placed the reinforcing steel, and concrete masons on
the bottom level finished the tower legs. The tower was topped out
in 68 working days.
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FIGURE 15-9 Slipform assembly for 568-ft tower. (Source: Sundt Corporation)
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