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<blockquote data-quote="hurleyjd" data-source="post: 732534" data-attributes="member: 4674"><p>Big Bull I think I would find me another fence builder and think that one is trying to shortcut you on the quality fence you need. Let me illustrate and see if you might under stand why. You are going to Jack your tractor up and have a bottle jack with a narrow base, what happens if you just set the jack on the ground it will sink into the ground. Now what do you do to keep that from happening I do not know what you do but here is what I do I find me some wide boards preferable some 2 X 12 boards to put under the jack to spread the weight out on the ground so the jack and boards do not sink. Get the point 2 7/8 is pretty narrow and does not spread the force of the fence pull to the dirt on either side of the hole. Now what happens if we dig a 12 inch diameter hole 36 inches deep and pour sackcrete around the post here we have created an area three times as wide as the 2 7/8 post pushed into the ground. now you have 432 sq inches bearing against the side of the hole with the sackcrete versus only 103.5 with the 2 7/8 dia. pipe pushed into the ground 36 inches. Really you need them 48 inches in the ground. Now if we pushed the 2 7/8 post into the ground 12 foot deep then it might just hold the fence same amount of sq inches as the 3 foot deep with 12 dia hole filled with sackcrete.</p></blockquote><p></p>
[QUOTE="hurleyjd, post: 732534, member: 4674"] Big Bull I think I would find me another fence builder and think that one is trying to shortcut you on the quality fence you need. Let me illustrate and see if you might under stand why. You are going to Jack your tractor up and have a bottle jack with a narrow base, what happens if you just set the jack on the ground it will sink into the ground. Now what do you do to keep that from happening I do not know what you do but here is what I do I find me some wide boards preferable some 2 X 12 boards to put under the jack to spread the weight out on the ground so the jack and boards do not sink. Get the point 2 7/8 is pretty narrow and does not spread the force of the fence pull to the dirt on either side of the hole. Now what happens if we dig a 12 inch diameter hole 36 inches deep and pour sackcrete around the post here we have created an area three times as wide as the 2 7/8 post pushed into the ground. now you have 432 sq inches bearing against the side of the hole with the sackcrete versus only 103.5 with the 2 7/8 dia. pipe pushed into the ground 36 inches. Really you need them 48 inches in the ground. Now if we pushed the 2 7/8 post into the ground 12 foot deep then it might just hold the fence same amount of sq inches as the 3 foot deep with 12 dia hole filled with sackcrete. [/QUOTE]
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