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

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Forms for Columns 313
of reuses justifies the initial cost or where special conditions require their
use. Steel round forms develop an exceptionally smooth, hard surface
that is free of voids and with a minimum number of seams.
Vertical and horizontal seams allow easy opening and closing of
the column forms with each pour. Angles are permanently attached
to the outside of the forms along each vertical and horizontal seam.
The angles from two mating seams are attached by speed-bolts.
Full-circle forms for column sizes up to 48 in. are usually assembled
by joining two half-circles, using steel bolts to join the component
parts (Figure 10-17). Quarter-round sections are available for largerdiameter
columns. Also, sections may be stacked on top of each other
and bolted together to provide forms of any desired height.
Standard column diameters from 12 to 72 in. and heights in
lengths of 1, 2, 4, and 8 ft are commonly available. Diameters from 12
to 36 in. are available in 2-in. increments. Diameters from 36 to 72 in.
1 1 / 4''
2'' × 1 / 4'' × 3 / 16 ''
Angles all sides
1/ 2 '' ∅ Speedbolt
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1 / 2'' ∅× 1 1 / 4''
Speedbolt
2''
(a) Attachment of vertical
and horizontal butt joint
12-gauge galv.
steel sheet
12-gauge galv.
steel sheet
(b) Half-round and quarter
round sections
(c) Assembled round steel
column form
FIGURE 10-17 Round steel column form. (Source: Deslauriers, Inc.)
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