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

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Forms for Columns 305
consulted. Typical clamp spacings shown in Figure 10-8 are for column
forms constructed of ¾- in. plywood and 2 × 6 studs placed flat, or 4 × 4
studs. Spacing may vary due to job conditions, temperature changes,
vibration, rate of placement of concrete, and type of lumber used for
construction of the form. The location of the studs should not exceed
12 in. on centers or a 6.5-in. span between members in all cases.
Column Forms Using Jahn Brackets and Cornerlocks
Figure 10-9 illustrates a column forming system that secures the plywood
and vertical studs with horizontal walers. Jahn brackets and
cornerlocks, described in Chapter 9 for wall forms, are used to fasten
horizontal walers.
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Cornerlocks
Vertical
studs
Single wales
spaced per
design
A brackets
(a) Isometric view of column form
(b) Jahn A bracket
(c) Jahn cornerlock
FIGURE 10-9 Column form with Jahn brackets and cornerlocks. (Source:
Dayton Superior Corporation)
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