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

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Forms for Walls 255
the six basic panels suggested for tie spacing of 16 in. in each direction
provide flexibility in forming for a large percentage of most
jobs. By using combinations of the six basic panels, placing them in
either the horizontal or vertical positions, walls may be formed with
heights ranging from 16 in. to 8 ft.
A floating waler with a ¼-in. shim between the horizontal waler
and the vertical strongback may be used at the top and bottom of the
panels, and at the edges of adjoining panels where a form tie is not
present to secure the plywood sheathing. Plyclips may also be used to
stabilize the vertical and horizontal joints of plywood.
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Forms for Pilasters and Corners
When a pilaster projects only a small distance from the main wall,
dimension lumber may be used to form the pilaster sides. The walers
should be butted against each pilaster side to give additional support.
A regular plywood panel or a specially cut panel can then be nailed
into the pilaster uprights with double-headed nails. Short 2 × 4 s can
then be locked firmly into place with cam-lock brackets. Figure 9-22(a)
shows this forming arrangement using the patented single-waler camlock
system of Gates & Sons. For wide pilasters, two ties should be
used to prevent shifting or deflection. If the projection is greater than
8 in., a cross tie should be added as shown in Figure 9-22(b).
Suggested forming for a corner and a “T” wall using the Gates &
Sons cam-lock system is illustrated in Figure 9-23. The outside corner
on high walls may be locked securely by running two vertical 2 × 4 s,
as shown in Figure 9-23(b). These vertical 2 × 4 s should be securely
nailed into the horizontal 2 × 4 s with double-headed nails.
FIGURE 9-22 Form assembly for small and large wall pilaster. (Source: Gates &
Sons, Inc.)
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