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

316 Chapter Ten
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Because they are lightweight, they are easily handled by one person.
The interlocking joints, both horizontal and vertical, minimize
grout, leakage, and discoloration.
Spring-Open Round Fiberglass Forms
Figures 10-21 and 10-22 illustrate a one-piece cylindrical column
form molded of fiberglass-reinforced polyester for a consistently
smooth concrete finish. It is fabricated as one piece with one vertical
joint that springs open for easy removal of the form. The vertical
joint is secured by wedge bolts. A round bracing collar is attached to
the form for alignment and to set an anchor template at the bottom
of the form.
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The interior of the column form is sanded and finished to produce
a smooth surface. This form is reusable and is available for rent
in diameters of 12, 16, 18, 24, 30, and 36 in. and in lengths ranging
from 4 to 16 ft in even 2-ft increments. The longer forms and other
diameters up to 48 in. are available for purchase only.
Columns up to 16 ft high can be poured with standard 150 lb per
cu ft density concrete. The thickness of the fiberglass material
increases with the diameter of the column form.
Key bolt and wedge
Contour bolt and nut
Steel bracing
collar
Attachment
plate
Bracing by
others
Steel
bracing
collar
(used as an
anchor template)
Adjustable turnbuckle
FIGURE 10-21 Erection of spring-open round fi berglass form. (Source:
Symons Corporation)
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