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  • From: Etienne Goyer <etienne AT lejardinduvillage.ca>
  • To: market-farming AT lists.ibiblio.org
  • Subject: Re: [Market-farming] For those who have built tunnels using Johnny'shoops bender
  • Date: Sun, 19 Feb 2012 09:14:31 -0500

Good point, I had not thought of that. It's true that the higher the tunnel, the more stress there will be on the post, especially with the wind load. And these chain link fence post are probably not the highest quality steel there is either.

Thanks for the insight, and the hindsight!

Etienne


On 12-02-18 07:38 PM, Tom wrote:
I haven't built one of these structures, but I have some building
experience and I would be quite concerned about putting 2 feet of the
post into the ground and leaving 4 feet out for the hoops to sit atop.
That sounds very shaky to me. I doubt if these posts are designed to
withstand the kind of force that would result from the weight of the
structure plus wind acting on a four foot lever arm at the top of each
post. That's a lot of leverage for a thin steel post to resist. In a
moderate to strong wind I think one of two things would happen. Either
the posts would fail and bend at the ground level or they would rip out
of the ground. I would even worry about just the spreading force of the
hoops being enough to bend the tops of the posts outward a bit -- maybe
a lot.

I built a Hanley-style hoop house and I had 13 two foot rebar lengths
pull out of the ground simultaneously during a fairly strong wind, and
that house had no flat sides.

In short, I think you will need to build a more substantial four foot
wall to rest your hoops on - something that can provide some serious
lateral stiffness both along the length of the wall and perpendicular to
the wall.
==============
Tom at Tom's Gardens
Cut Flowers & Veggies
Northern Lower Michigan



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--
Etienne Goyer - Le Jardin du Village
http://lejardinduvillage.wordpress.com

"Changer le monde, une betterave à la fois"





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