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

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Patented Forms for Concrete Floor Systems 367
FIGURE 12-3 Typical cross sections of adjustable steel forms; all dimensions
are outside to outside. (Source: Ceco Concrete Construction)
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available for use in constructing this type of floor system. Several
lengths are available to permit the forms to be used with slabs having
variable dimensions.
As shown in Figure 12-4, the forms are supported at the desired
height by nails driven through the vertical surfaces of the forms into
the joist soffits. The use of these forms permits the construction of
concrete slabs with considerable variety in the dimensions of the
joists.
One advantage of using this type of form is that the forms or pans
may be stripped as soon as the concrete over the forms has gained the
necessary strength, without disturbing the joist soffits and supporting
shores. This feature may permit an earlier reuse of this type of
pan than is possible with the flange-type pans.
Ceco Longforms
These forms are used with unsupported lengths of up to 12 ft between
beam tees or bridging joists. Because the Longforms must be cut to
suit the span length of the structure, there are no standard lengths.
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