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

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Slipforms 421
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FIGURE 15-5 Details of a hydraulic jack for lifting slipforms. (Source: Scanada
International, Inc.)
hollow jack, which is attached to a yoke. When pressure is applied
to a jack, one element of it grips the jack rod and another element
moves upward, lifting the yoke with it (see Figure 15-5). When
pressure is released temporarily, the jack resets itself automatically
for another upward movement. Because all jacks are interconnected
to a centrally located pump, the oil pressure on each jack
will be the same, which should assure uniform upward movements.
However, any given jack can be operated individually or
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