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Preppers' Corner
Prepper engineering: card #2 - The Bridge
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<blockquote data-quote="securitysix" data-source="post: 2698367" data-attributes="member: 32714"><p>You're saying that the notion of this exercise is that it is faster to design and build a bridge sturdy enough to carry an ATV, a small trailer and 2 people across a 6 foot deep, 12 foot wide ditch than it is to cut a vehicle wide swath through the trees blocking the road? And either way, you're trying to do this to rush someone to medical care, yes?</p><p></p><p>If you truly have them stabilized, you've got time to clear the road, which is a far safer option than trusting some bubba-engineered bridge.</p><p></p><p>If they're less "stabilized" and more "dying much slower", I'd look for a better place to just ford get into and out of the creek, even if it meant cutting a few neighbors' fences and fixing them later.</p><p></p><p>If I just had to quickly build a bridge that I could drive an ATV and trailer across, I'd dig a step into either side of the bank. These "steps" would be as deep as the thickness of the trees you'll be using for the bridge. They should each come a foot or two back from the bank, and they should each be at least a tree diameter, preferably two, wider than your ATV. Then I'd fell some sturdy trees that are long enough to span the gap, cut them to fit inside the steps, trim off any limbs, brushy twigs, or other things that would get in the way, and lash them together with some rope/para cord/sturdy vines, especially around the middle, to keep them from separating (the steps at either bank should hold the ends together).</p><p></p><p>Ideally, this setup would keep the tree trunks from shifting toward one bank or the other because they're cut to length, should keep them from rolling side to side because they're held in at the ends by the steps and tied together at intervals toward the middle, and would keep you from having to drive up/down onto or off of them.</p><p></p><p>Then, as I attempted to drive myself and my injured loved one across the bridge, I would pray that God thinks this is a better idea than I do and holds up the bridge until I'm across.</p><p></p><p>Of course, if you have time to build a bridge before someone's injured, you could take the time to do it right, and build a proper bridge with structural support and actual engineering behind it.</p></blockquote><p></p>
[QUOTE="securitysix, post: 2698367, member: 32714"] You're saying that the notion of this exercise is that it is faster to design and build a bridge sturdy enough to carry an ATV, a small trailer and 2 people across a 6 foot deep, 12 foot wide ditch than it is to cut a vehicle wide swath through the trees blocking the road? And either way, you're trying to do this to rush someone to medical care, yes? If you truly have them stabilized, you've got time to clear the road, which is a far safer option than trusting some bubba-engineered bridge. If they're less "stabilized" and more "dying much slower", I'd look for a better place to just ford get into and out of the creek, even if it meant cutting a few neighbors' fences and fixing them later. If I just had to quickly build a bridge that I could drive an ATV and trailer across, I'd dig a step into either side of the bank. These "steps" would be as deep as the thickness of the trees you'll be using for the bridge. They should each come a foot or two back from the bank, and they should each be at least a tree diameter, preferably two, wider than your ATV. Then I'd fell some sturdy trees that are long enough to span the gap, cut them to fit inside the steps, trim off any limbs, brushy twigs, or other things that would get in the way, and lash them together with some rope/para cord/sturdy vines, especially around the middle, to keep them from separating (the steps at either bank should hold the ends together). Ideally, this setup would keep the tree trunks from shifting toward one bank or the other because they're cut to length, should keep them from rolling side to side because they're held in at the ends by the steps and tied together at intervals toward the middle, and would keep you from having to drive up/down onto or off of them. Then, as I attempted to drive myself and my injured loved one across the bridge, I would pray that God thinks this is a better idea than I do and holds up the bridge until I'm across. Of course, if you have time to build a bridge before someone's injured, you could take the time to do it right, and build a proper bridge with structural support and actual engineering behind it. [/QUOTE]
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