Page 51 - Masonry and Concrete

Concrete Construction Techniques
50 CHAPTER THREE

2 6 FORM STRING LINE
1
1
(1 / 2 5 / 2 ACTUAL SIZE)

DOUBLE-HEADED
NAILS
CONCRETE THK. STAKE

6"

BACKFILL TO
KEEP CONCRETE
FROM LEAKING
UNDERNEATH FORM
FIGURE 3-11
Form boards set to string line.

be 12 in. to 16 in on center. For columns up to 24 in. wide and 16 ft.
tall, Figure 3-14 shows recommended yoke spacing. You can also buy
round cardboard forms for columns, but you will have to build some
supporting framework to hold them firmly in place during the con-
crete pour.

3.3.2 Permanent Formwork
In patios and sidewalks, form boards are sometimes left in place to
serve as decorative dividers and edging. Corners and intersections
should be formed as neat butt joints or miter joint. Stakes should be
located inside rather than outside the form and driven well below the
surface so they will be adequately covered by the concrete. Drive 16-d
galvanized nails through the outside of the form boards at about 16 in.

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