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

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Forms for Columns 311
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FIGURE 10-15 Setup arrangements for all-metal modular concrete columns.
(Source: EFCO)
Fiber Tubes for Round Columns
Forms that are used frequently for round concrete columns are available
under various trade names. An example of these types of forms
is the Sonotube shown in Figure 10-16, manufactured by the Sonoco
Products Company. This form is made from many layers of highquality
fiber, spirally wound and laminated with a special adhesive.
Fiber form tubes are manufactured for column sizes from 6 to 48 in.,
in increments of 2 in. The tube should be braced every 8 ft. For a rate
of concrete placement of less than 15 ft per hr and concrete pressures
up to 3,000 lb per sq ft, the tubes will not cause the form to buckle,
swell, or lose shape. The concrete can be vibrated as required, but
care should be taken to prevent the vibrator from damaging the form.
Concrete should be placed with a tremie.
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