Wood form for 13' high poured wall? 1

[goldilocks]

I need to pour a concrete wall 13' high x 12' long x 2' thick. Is it possible to build a wooden form for this, or is that too much pressure? I have built forms for 8' high walls nut never anything this big.
Thanks---

-T

 

[ishvaaag]

You can make it in wood or whatever as long as strong enough. YOu simply need to input the proper pressure for the kind of pouring youwill be doing, and then dimension the from elements for their forces.

Maximum lateral pressure for Design of Wall Forms you have at

Standard Handbook of Heavy Construction 3d ed
O'Brien, Havers, Stubbs Jr.
Mc Graw Hill
Table C1-21 at p. c1-97

Then dimension the wood elements, and and shores for your code. For classical dimensioning of wood elements I have sheets of free download for Mathcad 2000 Pro in the Collaboratory site at Mathsoft.

 

[Ron]

You may use wood. Keep in mind that the pressure on the form at the base of the wall will be about 1800 psf if you pour the wall quickly. For this application, the rate of placement will be a significant factor. Find a reference on formwork (i.e., "Formwork for Concrete Structures&quot and check the placement rate tables to see the pressure on the wall at any given height of plastic concrete.

You will need to space the Snap-Ties closely so that you don't get a "pillow" effect in the wall from deflection of your plywood form. Use MDO plywood, if you can get it.

Be sure to anchor a 2x member at the bottom to prevent blow-out, and at each plywood joint.