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

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CHAPTER 12
Patented Forms
for Concrete
Floor Systems
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Introduction
Many kinds of patented forms for concrete floor systems are available,
and the designer usually specifies the particular system that is
to be used. Several, but not all, of these systems are illustrated and
described in this chapter.
Ceco Flangeforms
As illustrated in Figure 12-1, these forms are available in standard
widths of 20 and 30 in. and in lengths of 1, 2, and 3 ft for forming regularly
spaced joists. Special filler widths of 10 and 15 in. are available in
1- and 2-ft lengths for filling nonstandard spaces. The tapered Endforms
are used at the ends of joists where extra joist width is required. They
are furnished only in 20- and 30-in. standard widths and in standard 3-ft
lengths. Endcaps are used as closures at the ends of all rows of Flangeforms
at beams, bridging joists, and special headers. The available
depths are given in Figure 12-1. All dimensions are measured from the
outside surfaces of the forms.
As illustrated in Figure 12-2, the forms are assembled on joist soffits.
They are also supported by resisting the flanges on joist soffits,
such as 2 × 8 lumber laid flat on wood stringers, which in turn are
supported by shores. Flange-type forms have several advantages
when compared with other types of forms, including the following:
1. The depth of the joist is uniformly fixed by the depth of the form.
2. Forms are installed with all operations such as placing, spacing,
and nailing performed above the supporting members.
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