Grain Systems Tanks PNEG-1094 - Manual (Page 23)

5. Foundations
PNEG-1094 Farm Grain Bin - 4" Corrugation 23
Frost Free Pad Recommendations
Frost Free Pads
The foundation design is based on a minimum allowable soil bearing capacity of 3000 PSF.
Bearing capacity of the soils should be determined by geotechnical investigation and be of uniform
bearing capacity.
1. The foundation site must be free of vegetation and debris and well drained.
2. The foundation must be founded below the frost line or placed on non expansive frost free fill.
3. All material used for backfill inside the ring wall should be clean, well graded, crushed rock or a sand
and gravel mixture. Backfill should be placed in 6" lifts, 95% compaction.
4. All reinforcement must meet the requirements of ASTM A615 Grade 60 deformed bars.
5. Lap all circumferential bars 35 bar diameters and stagger all laps in plans 3'-0". Estimates do not
include end laps.
6. Concrete must have a minimum compressive strength of 3000 PSI at 28 days, 6%-8% air
entrainment and 4" slump.
Figure 5I Frost Free Pad
* Contact the manufacturer’s engineering department for heights greater then 6".
The optional #4 rebar grid can be substituted for the wire mesh in most cases. Place the #4 bars in the
pad at 18" c/c each way.