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

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Forms for Walls 253
based on using 20d nails only to fasten the studs to the frames. The
use of metal connectors will permit a reduction in the number of 20d
nails to a maximum of three per joint.
Commercial, or Proprietary, Form Panels
Proprietary panels, which are available in several types, are used frequently
to construct forms, especially for concrete walls. Among the
advantages of using these panels are many reuses, a reduction in the
labor required to erect and dismantle the forms, a good fit, and a reduction
in the quantity of additional lumber required for studs and wales.
Most manufacturers furnish panels of several sizes to provide
flexibility in the dimensions of forms. However, where the exact
dimensions of forms are not attainable with these panels, job-built
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filler panels may be used to obtain the desired dimensions.
A wide variety of accessories is available from manufacturers in the
concrete construction industry. These accessories allow quick assembly
and removal of forms and enhance safety by providing secure attachment
of the form materials by patented clamping and locking devices.
Gates Single-Waler Cam-Lock System
A forming system developed by Gates & Sons, Inc. uses plywood
panels, wales, strongbacks, form ties, and cam-locks to secure the tension
in the ties. The panel thickness, size of frame lumber, and tie
strength are designed corresponding to the pressure appropriate for
each particular job.
As illustrated in Figure 9-20, the cam-lock brackets on each side of
the plywood sheathing secure the loop end form tie and the horizontal
FIGURE 9-20 Patented cam-lock hardware for wall formwork. (Source: Gates &
Sons, Inc.)
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