Posted by JD Seller on December 04, 2016 at 10:20:36 from (208.126.196.24):
In Reply to: Another bin question... posted by Dave H (MI) on December 04, 2016 at 09:06:24:
I used to dig the foundations by hand and use 3/8 plywood for the forms. We usually dug down three feet. Then formed up a foot above the ground at the edge. We threw the dirt into the middle of the foundation. So the outside is thick and the inside floor thickness is only 3-4 inches thick at the middle. The footers where usually about 12 inches wide at the base. Then they would taper to wider as you shaped the top. So you end up with about a two foot wide heavy section at the top of the trench. Then you fill the middle to where the floor is only 4-5 inches at the side tapering to less in the middle.
I always started by driving a four foot long 1/2 pipe in the center of where I wanted to build the bin. Put the top of this pipe at the height you want the center of the floor to be. I usually made the center 1-2 inches higher then the outside so any water would run away from the center of the bin. One inch is enough for bins smaller than 28 foot. Go up towards the two inch mark as they go bigger. So if your building a 18 foot bin I would make the foundation 20 foot. So you would need a straight 2x6 longer than 10 foot. On this 2x6 I would fasten a 1/2 rod that would drop into the 1/2 pipe making a center pivot for the board. So with just a level on top of the 2x6 you can set your outside forms and the level of your gravel under the center concrete. You also use this board to screed off the concrete. With a mark on the board you make your circle for the dug foundation and the shape of the outside form. IF you have the dimensions of your bin then you know where the anchor bolts need to go. Put another mark on the 2x6 and you can set them as you screed the concrete off.
I have moved and built 15-20 bins in my life. We usually could dig and set the forms in one day with three men working. This was all by hand. The smaller excavators where not known back then. We would pour then the next day.
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