Posted by andy r on October 18, 2013 at 07:09:07 from (75.91.149.15):
In Reply to: Grain slab size posted by JEH on October 18, 2013 at 05:28:39:
It sounds like what you have is actually a bulk bin since it is 6 feet across with legs?? What I have seen with the bulk bins is to pour a 6" slab of moderately strong concrete extending a foot past the diameter of the sides. When you layout the forms dig holes immediately under where the legs will sit an additional 12 inches, since the weight is going to be concentrated. The holes could be one foot in diameter. Actually you should have a rat barrier around the entire slab, so both could be accomplished by digging a one foot by one foot trench around the slab. That would support the bin and provide rat protection. I would think that would be more than plenty to support the bin. Most 18' - 7 ring grain bins are sitting on a 6" slab with a 1' by 1' trench around the outside under the 6" slab. Fastening the bin down isn't that hard. Done several of them. Set the bin on the hardened concrete to get it centered. Either weld plates to the bottom of the legs with 1/2" holes in them or use 4" wide angle irons and bolt to the leg and concrete. Drill 1/2" holes in the concrete with a concrete bit (not that hard to do - concrete drill helps - cheap at Menards.) Then use concrete anchor bolts. 1/2" reinforcing rod every foot across sideways and then every foot longways would be beneficial as well, not to prevent cracking, but to prevent the concrete from spreading when it does crack. Make sure the re-rod is midway in the slab when the concrete is poured and out of the way were the concrete anchors will be put. Make sure you are pouring on either a soild base or tamped fill. Not that hard - 1/2 a day job.
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