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

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Forms for Columns 301
3 / 4 '' plywood
Alternate
clamps 90°
2 × 4 battens
Square
corners
(b) Isometric view of
square column
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With 2 × 4 flat
(a) Plan view of square
column
FIGURE 10-6 Column form with steel clamps and steel wedges. (Source: Dayton
Superior Corporation)
shown are for the column clamps only. Additional checks of the
sheathing must be performed to determine the limiting clamp
spacing based on the strength and deflection and of the sheathing
(see Example 10-2).
Example 10-5
Use Table 10-4 to determine the spacing and number of column
clamps for a 20-in. square column 10 ft high. The sheathing will be
¾-in.-thick Plyform with 2 × 4 vertical wood battens.
Using the full hydrostatic pressure of the concrete on the forms,
the maximum lateral pressure will be:
From Eq. (3-1), P = wh
= (150 lb per cu ft)(10 ft)
= 1,500 lb per sq ft
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