Grain Systems Bin Accessories PNEG-318 - Manual (Page 50)

50 PNEG-318 Concrete Foundation Recommendations for GSI Grain Bins
11. Frost Free Pad Commercial Tank
Frost Free Pad Notes:
1. 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.
2. The foundation site must be free of vegetation and debris and well drained.
3. The foundation must be founded below the frost line or constructed on non-expansive frost free fill.
4. All material used for backfill inside the ring wall should be clean, well graded, crushed rock or a
sand-gravel mixture. Backfill should be placed in 6" lifts, 95% compaction.
5. All reinforcement must meet the requirements of ASTM A615 grade 60 deformed bars.
6. Lap all circumferential bars 35 bar diameters and stagger all laps in plans 3'-0". Estimates do not
include end laps.
7. Concrete must have a minimum compressive strength of 3000 PSI at 28 days, 6%-8% air
entrainment, 4" slump.
Figure 11A
* Contact GSI Engineering for heights greater than 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.
All foundation specifications shall be construed as
recommendations only. Because of the many
variable conditions in actual installation, GSI
assumes no liability for results arising
from the use of such recommendations.