User guide

3. Foundation Requirements
10 PNEG-1276 Top Dry Autoflow Construction Manual 24', 30' and 36'
Foundation Requirements for Top Dry Bins (4.00" Top Dry
Bin Corrugation) (Continued)
Prepare the Foundation Forms
Having scribed the diameter of the foundation, proceed by digging the foundation’s footing. This consists
of a large circular trench dug inside the foundation line, (Refer to foundation details for necessary
information). Once the footing has been dug, you are ready to build the forms. It is important that the forms
be rigid enough to hold its shape against the poured concrete. Also, the foundation must be flat. Sloped
floors cannot be used in drying bins. A carpenter’s level placed on top of the compass 2 x 4 will enable
you to set the top of the forms to match the top of the center stake. Check the form work with a transit
to ensure a uniform elevation for the entire foundation. The foundation should be level within 1/8" on
non-stiffened tanks and 1/4" on stiffened tanks at bin wall perimeter. Stiffened tanks must be shimmed
level. (See Figure 3B.)
Figure 3B
All foundation specifications shall be construed as recommendations only. Because of the many variable
conditions in actual installation, the GSI Group, assumes no liability for results arising from the use of such
recommendations.
Alternate Foundation Forms
There are two (2) styles of foundation forms commonly used. The first is the circular form shown in
Figure 3B. The second style of foundation can be made of 2" x 8" boards set into a square with the
corners blocked off to form an octagon. This eight sided form will approximate a circle and can also be
constructed easily.