Grain Systems Tanks PNEG-1093 - Manual (Page 16)

5. Foundation
16 PNEG-1093 2.66" Corrugation Unstiffened Bin
Foundation Forms
Foundation Form Options
There are two (2) styles of foundation forms commonly used for unstiffened farm bins. The first is the
Circular Form.
(See Figure 5B.) The second style of foundation is the Octagon Form, made of 2" x 8"
boards set into a square with the corners blocked off to form an octagon. (See Figure 5C on Page 17.) This
eight (8) sided form will approximate a circle and is easy to construct.
Figure 5B Circular Form
Preparing the Foundation Forms
1. Having scribed the diameter of the foundation, proceed by digging the foundation’s footing.
This consist of a large circular trench dug inside the foundation line. (Refer to foundation charts
on Pages 18-26. )
2. 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.
3. 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.
4. 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. Provisions for unloading system trenches, air
ducts, etc., should be made as required by the particular grain system used.
NOTE: All foundation specifications shall be construed as recommendations only. Because of the many
variable conditions in actual installation, manufacturer assumes no liability for results arising from
the use of such recommendations.
T
Footing trench
Carpenter’s level