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One Sided Forms Against Shoring Wall

 
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Old 03-25-2015, 07:53 PM   #1
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One Sided Forms Against Shoring Wall


I am more or less looking for some input on some ideas regarding doing a onesided pour against a shoring wall .
Essentially we have been either thinking of getting long lag bolts to drill into the wood lagging that would extend to the outside of the walers with a big square washer.

I actually was thinking of actually getting sqaure washers welded to one end of a threaded rod .. And lift up the lagging , sliding the rod through and pulling the washer right tight to the backside of the shoring .. Then doing the standard PVC spacer .. Horizontal aluma beam studs and vertical aluma beam strong backs . To give anyone an idea for scale the wall is only 8' high .
Do these seem plausible or am I out to lunch ?
Sketch included!One sided forms against shoring wall-imageuploadedbycontractortalk1427331161.361568.jpg
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Old 03-28-2015, 10:40 AM   #2
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Re: One Sided Forms Against Shoring Wall


We did a wall once. Like 14' high, I think 10' thick, one sided. We braced the hell out of it. Used tons of braces. Drilled from the inside of the gunite (3" thick) with #9 wire to the Symon forms and put a doughnut on the outside. I don't remember the spacing but it was pretty often just as added insurance knowing it wouldn't add anything significant. It held but it felt pretty iffy to be honest when we were pouring. We always go with overkill on one sided stuff. One sided forms against shoring wall-imageuploadedbycontractortalk1427557081.940367.jpg

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Old 03-28-2015, 11:37 AM   #3
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Re: One Sided Forms Against Shoring Wall


Do you have to waterproof the blind side?
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Old 03-28-2015, 11:44 AM   #4
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Re: One Sided Forms Against Shoring Wall


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Do you have to waterproof the blind side?

The general contractor did, not us though.
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Old 03-28-2015, 12:16 PM   #5
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Re: One Sided Forms Against Shoring Wall


I'm planning on waterproofing the wood lagging then use MirDrain...unless someone knows something different we should do.
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Old 03-28-2015, 02:15 PM   #6
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Re: One Sided Forms Against Shoring Wall


If you are using Symons handset forms you can use Coil Lag and then coil rod and a loop tie adaptor. Or you can use the same Coil Lag and coil rod flat plate and nuts.
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Old 03-28-2015, 02:17 PM   #7
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Re: One Sided Forms Against Shoring Wall


I was planning coil lag/threaded rod/coil snap tie

Almost $8.00 per location!!!
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Old 03-28-2015, 02:20 PM   #8
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Re: One Sided Forms Against Shoring Wall


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I'm planning on waterproofing the wood lagging then use MirDrain...unless someone knows something different we should do.
How do you plan on waterproofing the lagging? Normally we use Bentonite panels and a drainage composite panel
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Old 03-28-2015, 02:24 PM   #9
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Re: One Sided Forms Against Shoring Wall


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I was planning coil lag/threaded rod/coil snap tie

Almost $8.00 per location!!!
Yep that why single side form pours are so expensive. Your other option is big footing and steel A frame form system no ties in the wall only in the footing.
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Old 03-28-2015, 03:01 PM   #10
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Re: One Sided Forms Against Shoring Wall


I was planning my Aquaseal on the lagging followed by MirDrain then then the coil lags

Option 2 is a 1 sided ICF form, EPS to the outside, waterproof as we stack, after the pour I can slip Delta MS between ICF and the shoring wall, hang it like a curtain. I've done this method more then once.
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Old 03-29-2015, 07:19 PM   #11
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Re: One Sided Forms Against Shoring Wall


Lets get menonites to come install the bentonite
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Old 04-08-2015, 09:06 AM   #12
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Re: One Sided Forms Against Shoring Wall


Is this a residential pour? Also Not sure what code is in your area but all blind wall pours, suspended slab and walls over 8' need to be engineered. For blind wall pours use a out rigger form anchored to slab to prevent uplift and do not exceed the pour rate. I recall typically for this design will be 4 feet an hour with a standard slump mix. The biggest thing to remember is not to exceed pour rate. Also coil nut inserts may pull out shotcrete.

Get an engineer. YOu dont want a failure.

I just looked at your drawing what is logging? As if you are installing threw the logging it will not be considered a blindwall pour as pressure will be equal on both sides. So you could use snap ties and conventional form design as per the burke book. Do they still exist?

Also if you have a good supplier snapties do com with a bentonite ring

Modern version of burke book

http://www.daytonsuperior.com/docs/d....pdf?sfvrsn=18

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Old 04-08-2015, 09:19 AM   #13
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Re: One Sided Forms Against Shoring Wall


It's a multi family unit, this is the underground parking garage.

It's lagging not logging. It is a one side pour as the lagging as is the wood between the shoring holding back the Main Street from collapsing into the excavated area.

We have an engineer...he's a 'loose' engineer, he asks us what/how we want to do it, and then designs what we want to do. As bad as that sounds, it's actually better for us, we can price and use materials/techniques we are familiar with.

This wall is upwards of 14' tall and because of the shoring wall will be anywheres from 8" to 24" thick (shoring is never straight...at least not around here)

4' per hour is standard lift height
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Old 05-13-2015, 05:00 PM   #14
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Re: One Sided Forms Against Shoring Wall


That seems like an overly complex way of doing this FramingPro.

I've developed my own way of one sided forming but the other concrete wall must be solid enough to epoxy anchors into it.
Coil Rod, panels, whalers and strongbacks.

Unless you really know what your doing..... get a structural engineer.

If the other wall is suspect then Nac shows another really good way of forming this.

But again, unless you really know what your doing get an engineer because something like this can go sideways so fast you wouldn't believe it.
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Old 06-06-2015, 11:05 PM   #15
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Re: One Sided Forms Against Shoring Wall


Shotcrete. We have a one sided wall coming up. 13' high. Talked with the GC and will allow us to use Shotcrete so we subbed out accordingly.
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Old 06-07-2015, 06:55 AM   #16
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Re: One Sided Forms Against Shoring Wall


Shotcrete was outside the budget, so I have ordered the coil lag's from Steel Dog, should be here in a week
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Old 06-07-2015, 04:03 PM   #17
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Re: One Sided Forms Against Shoring Wall


Park a couple trucks up against the form and call it a day. Haha.
Fun following this stuff even though I'll never do it.
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Old 06-07-2015, 06:20 PM   #18
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Re: One Sided Forms Against Shoring Wall


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Park a couple trucks up against the form and call it a day. Haha.
Fun following this stuff even though I'll never do it.
I'm sure we can scrounge up a few Fords to put in place for you
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Old 06-07-2015, 06:26 PM   #19
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Re: One Sided Forms Against Shoring Wall


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Shotcrete was outside the budget, so I have ordered the coil lag's from Steel Dog, should be here in a week
Im surprised it didn't save you money when it came down to labor etc. We saved quite a bit of money when we were able to switch. I hate doing these walls.
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Old 06-07-2015, 10:19 PM   #20
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Re: One Sided Forms Against Shoring Wall


When all the shouting's done, how much more expensive, in broad percentage terms, would shotcrete have been?

Edit: I don't doubt that you made the right decision, by the way. I'm asking in order to learn something.

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