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

302 Chapter Ten
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Note:
Courtesy, Dayton Superior Corporation.
TABLE 10-4 Column Clamp Spacing Chart
The column clamp opening will be the width of the column plus
twice the thickness of the 2 × 4 stud and the ¾-in. plywood sheathing:
20 + 2(1.5 + 0.75) = 24.5 in. Therefore, from Table 10-4 select the
36-in. column clamp with a 24.5-in. opening. As shown in Table 10-4,
the 36-in. column clamp with a 1,500 lb per sq ft pressure and
24.5-in. column opening requires seven column clamps. The lower
10-in. spacing must be adjusted because the bottom clamp requires
6-in. clearance above the slab. The total number of required clamps
is 7, spaced at 6, 8, 12, 14, 17, 26, and 33 in.
The ¾-in. Plyform sheathing backed with 2 × 4 vertical wood
battens must have adequate strength and rigidity to transfer the concrete
pressure between the column clamps. Example 10-2 shows the
calculations to ensure adequacy of the sheathing and vertical wood
battens.
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