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Kingston,Mi | Using your size and building it as 2 pits of 20 by 50 by 8 ft. The excavation would be :
1/6 ((56x66) + (4(48x58))+(40x50))x8=22442.7 cu.ft or 831.2 cu. yd. at $3.50/cu.yd =$2909 for excavation
A 8 inch reinforced concrete wall : (3x40)+(2x50) =220 lin ft. of wall x8in/12in. per ft. x8 ft. =1760 cu. ft.
Footing; approx. 10inch by 6ft. x270 ft.= 1350 cu. ft.
Total reinforced concrete: 1760 +1350 cu ft. =3110 cu ft. or 115 cu yd. x $350/Cu yd. (includes steel, concrete, forming and finishing) =$40250
Plain concrete floor 6 inches thick: 10 x40x 2 pits = 800 sq. ft. x$3/sq.ft. =$2400 (includes concrete, plament and finishing on 4 inches of sand).
Subtotal: $45559.00
excavation.................................$2909.00
reinforced concrete.............$40250.00
plain concrete............................$2400.00
Now you have a 8 ft. deep pit with some sand and no easy way of accessing the sand, Florida NRCS has designs for shallow sand settlement pits that are eqipped with ramps to drive into and remove the sand. at the entrance the manure, liquids and sand are directed to either pit with a moveable gate.
This design also benefits from a shallower depth and thinner concrete walls. To access a pit that is 8 ft. deep it needs to be about 100 ft. long so that you can have a 8:1 ramp and a landing at the bottom.
This is the rational for sand lanes, where the manure and sand are washed with water from the storage pit. Some "sand" still gets to the storage pit but the heavier particles (the sand) are left on the lane then removed, allowed to dry and eventually reused with supplemental sand. Eventually the washing and supplementation with new sand will decrease the amount of fines that enter the storage pit. Downside is the constant pumping of water from the storage pit and the constrution of the sand lanes and storage area.
The NRCS in Michigan has not designed any of the sand lane seperators, but have seen quite afew that operate quite well once we got over the fact that not all the beeding sand would be removed. all of the sand lanes were designed by private engineers.
EDIT. Should add that the above cost estimate is VERY prilimanary and basic, lots of factors where not examined; such as need for water table management, fencing, operqtional areas and of course the "fudge factor" or cost over runs and misc. items.
Edited by BOGTROTTER 4/5/2011 08:16
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Concrete pit ???
