Page 50 - Masonry and Concrete

Concrete Construction Techniques
49
CONCRETE CONSTRUCTION TECHNIQUES

For taller forms, additional bracing to support the pressure of the
concrete is needed. Vertical 2 4 studs and horizontal 2 4 wales are
used for wall forms, and 2 4 yokes for column forms (Figure 3-13).
In large forms, the lateral pressure of the concrete can be well over
1000 psf, so the spacing of supports must be close together to resist the
tremendous weight without collapse. For wall forms, the studs should
about 24 in. on center if you’re using 2 form boards, or 12 in. to 16.
3
in on center if you’re using 4-in. plywood. Supporting wales should

STRING LINE STAKES

TEMPORARY
STRING LINES AT TOP OF
REBAR
FORM ELEVATION
STAKES

FORM
STAKES

CONCRETE
WIDTH

FIGURE 3-10

Corner forms and stakes.

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