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Single Sided Concrete Forms?

 
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Old 08-03-2014, 08:49 AM   #1
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Single Sided Concrete Forms?


I have a 30' long x 6'4" high 12" wall I have to pour up against an existing hollow CMU wall. Normally would just use coil rod insert's and loop tie adaptors to a Symons panel if it was a solid wall. I proposed using a Hilti screen and epoxy coil rod and loop ties and the engineer does not want me to tie into the existing CMU wall. I know they make steel A frames for this application seems like overkill for a 6'4" wall. I was thinking a whaler at the top and bottom with a strong back every 4' and a 45 degree kicker at every strong back. Has anyone done a form like this or have any suggestions?
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Old 08-03-2014, 08:54 AM   #2
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Re: Single Sided Concrete Forms?


Seems to me you are on the right path with the whaler, strong back and kicker plan. Maybe a whaler in the middle as well just for fun. Its easier to have more bracing than find out you need more in mid pour.

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Old 08-03-2014, 09:17 AM   #3
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Re: Single Sided Concrete Forms?


We typically use the coil rod method also. I'd say add another whaler and you're on the right track, just throw some extra bracing in for a little security.
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Old 08-03-2014, 08:52 PM   #4
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Re: Single Sided Concrete Forms?


Quote:
Originally Posted by Nac View Post
I have a 30' long x 6'4" high 12" wall I have to pour up against an existing hollow CMU wall. Normally would just use coil rod insert's and loop tie adaptors to a Symons panel if it was a solid wall. I proposed using a Hilti screen and epoxy coil rod and loop ties and the engineer does not want me to tie into the existing CMU wall. I know they make steel A frames for this application seems like overkill for a 6'4" wall. I was thinking a whaler at the top and bottom with a strong back every 4' and a 45 degree kicker at every strong back. Has anyone done a form like this or have any suggestions?
Just remember, when you only form one side, think twice the pressure. Brace the h*** out of it!
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Old 08-21-2014, 07:32 PM   #5
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Re: Single Sided Concrete Forms?


Ended up renting Ulma forms and mini A frames anchored to the footings.
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Old 10-15-2014, 06:29 PM   #6
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Re: Single Sided Concrete Forms?


Thats pretty neat.. heavy duty forms for a light duty resi job
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Old 12-16-2014, 10:11 PM   #7
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Re: Single Sided Concrete Forms?


Did it hold?
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Old 12-17-2014, 09:42 AM   #8
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Re: Single Sided Concrete Forms?


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Did it hold?
Yes it held if you look at the bottom there is a waler on a 45 there are (2) 5/8 treaded rods epoxied 2' deep at every strong back holding the forms in place. Here is a pic of the wall striped before we rubbed it down.
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Old 12-17-2014, 12:04 PM   #9
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Re: Single Sided Concrete Forms?


Who spilled the coffee?
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Old 12-17-2014, 03:03 PM   #10
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Re: Single Sided Concrete Forms?


Why did this have to be done? Bearing for a new extension or was the block unstable? Seems like the block had to be in good shape to hold the p wet concrete back...

Just wondering
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Old 12-17-2014, 04:56 PM   #11
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Re: Single Sided Concrete Forms?


Looks good. We did somthing similar on a ranch home, we were adding a basement addition and had to underpin under the footer for these 8' walls. Pretty much did the same thing only with gates.

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