pier construction does any one know if i can pour a 12″ x 4′ pier 8′ o.c to build a one story camp in an area w/ sand .
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I'd probably want the Bigfoot style forms to spread the load
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want the Bigfoot style forms to spread the load
Ugh, just mentally pictured the slope-back sand would want for a 42-48" diameter hole 96" deep . . .
"Sand" being different than "sandy" naturally . . .
That, and all we can do, really, is speculate.Occupational hazard of my occupation not being around (sorry Bubba)
He was wanting eight feet on center, not eight feet deep, IIRC
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eight feet on center, not eight feet deep, IIRC
You are likely correct, I'm still trying to shoe horn memories of trying to shift beach and dune sand . . . <spits out dust, coff,coff>Occupational hazard of my occupation not being around (sorry Bubba)
Sand has a bearing capacity IIRC of 25#/sq.ft.
Your camp might have a weight of 100#/sq.ft., depending on where you're located. At 8' o.c. that translates to 6400#/pier.
6400lbs/25lbs/sq.ft.= 256 sq.inches
Pi R^2 = 256
Radius=9in
Diameter=18"
Bigfoot is a good idea.
Wanna check that load bearing capacity of sand again? at the rate you quote, I would sink into it with every step I take.
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Bearing capacity of "medium dense sand" is 15-50 lb/sq.in. BB's value is even less, 12.5 lb/sq.in.
You do sink into the sand with every step.
Edit to add:
Just realized I wrote 25 lb/sq.ft. Should have said sq.in.
Edited 4/10/2007 6:15 pm ET by woodguy99
It seems to me if the soil's load-bearing capacity is 25 pounds/sf and you have something that weighs 100 pounds/sf, the "pad" needs to be four times larger than the "something".
So convenient a thing it is to be a reasonable Creature, since it enables one to find or make a Reason for everything one has a mind to do. --Benjamin Franklin
the bearing ratio of sand is 1800 lb sq ft
Sorry, it was early. Should have said 25 pounds per square inch.
Knew you'd want to make that right;)
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make one point, with piling in sand one much take into account skin friction of sand. althought during driving, a pile will move with at least 10 blows, after couple days it will take 100 blows to move.So in relation to piers. It might only hold 12 lbs /sq inch after couple days it could hold at least 50 lbs/ sq in. if the pier in buried
I would definitely want an engineer to calc friction loading for me! Not a seat of the pants kind of thing
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that why we to pile load test.
Sand is a good base most times, but you need a local soils engineer to tell you how big a footer you need under the piers.
Your AHJ may have a prescribed size.
SamT
There are three kinds of people: Predaters, Prey, and Paladins. For the life of me, I can't see why Prey feels safer from predators by disarming and emasculating Paladins.
are you thinking of foour feet out of the ground on top of the sand or four feet deep to get below frost line? The region of the country you are in is important to the accuracy of answers you will find.
As always, local AHJ dictate the rules to be followed, not general principles.
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