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

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Forms for Columns 303
Concrete Column Forms with Patented Rotating
Locking Device
Figure 10-7 illustrates a column forming system with ¾-in. plywood
sheathing, vertical 2 × 6 studs, and steel clamps that are secured by a
patented device with a handle that rotates to open and close the column
clamp. The patented cam-over column clamp has a claw that
engages the pin at the closing corner and quickly and securely locks
the column form together.
The form can be job built and gang formed with no loose pieces.
The column clamps are fabricated from steel angles with ½-in.-diameter
holes spaced at 1 in. on centers along the clamp for adjustment of the
column clamp to various sizes. The studs are placed flat against the
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plywood at a maximum spacing of 12 in. on centers. For special load
conditions, 4 × 4 studs may also be used in lieu of the 2 × 4 studs.
FIGURE 10-7 Steel column clamps with rotating locking device. (Source: Gates &
Sons, Inc.)
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