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

296 Chapter Ten
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2 × 4 vertical
wood battens
3 / 4 -in
Plyform
20''
20''
5.875''
3.5''
5.875''
ww.EasyEngineering.n
3 / 4 '' 20.75''
3 / 4 ''
22.25''
FIGURE 10-4 Assembled forms for 20-in.-square column with ¾-in. Plyform
backed with 2 × 4 vertical wood battens.
Column Clamps for Column Forms
Column clamps that provide support for the sheathing of column
forms may be constructed of wood yokes or steel clamps. Wood yokes
are not as commonly used today as they have been in the past.
Several types of attachments and locking devices are available
from numerous manufacturers, which may be used to secure the
composite plywood and stud forming system. These formwork accessories
include patented steel clamps, which are attached with wedge
bolts, and cam-locks, which attach horizontal walers on the outside
of the vertical studs.
Design of Wood Yokes for Columns
Wood yokes may be made from 2 × 4, 3 × 4, or 4 × 4, or larger pieces
of lumber, assembled around a column, as illustrated in Figure 10-5.
Two steel bolts are installed through holes to hold the yoke members
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