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Re: Permanent metal forms for concrete

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Nels,

I might be late in the reply, but we run into this all the time. Typically we refer to forming in inaccessible areas as "waste forms", because they are left in place and cannot be re-used. Waste forms can be metal deck with bearing angles, but frequently the unshored span of the metal deck is inadequate for the thickness and span of the slab above. Wood and plywood forms are often used with the understanding that they will be lost; it is really no big thing. Plywood formwork has a useful life just like everything else, they will typically use those pieces that are close to the end of their service life. Alternatively the metal deck can be used, but with waste cripple walls as form shoring. Metal deck or plywood, there isn't a lot of cost difference in what is being left behind; so unless there is some direct benefit of using the metal deck or it is already on the job, we just use ply.

If you are dealing with small spaces below the ramp, only a few feet or less, than we frequently build up the area using HDPE foam with rib beams and topping slab. The foam is permanently encapsulated. This is particularly useful for small areas of floor elevation change or accessibility ramps within an otherwise flat floor environment.

The other choice is to create access to the form space for form removal, then close it off after. Frequently this will actually cost more than just losing the forms.


Paul Feather PE, SE
www.SE-Solutions.net
pfeather(--nospam--at)SE-Solutions.net
----- Original Message ----- From: "Nels Roselund" <njineer(--nospam--at)att.net>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, February 02, 2006 4:17 PM
Subject: Permanent metal forms for concrete



To form the soffit of a concrete slab and ramp over a space that will become permanently inaccessible, what is ordinarily done? Is it generally left to
the contractor to provide appropriate forms?  This seems right, since my
Drawings are intended to show the completed structure, while forms are part
of the means of construction.

I'm thinking of metal decking.  If my Drawings should show the metal-deck
forms, who manufactures it for So. CA? Verco does not seem to manufacture a deck specifically for that purpose -- theirs is the only catalog that I have
in my library.

Nels Roselund, SE
njineer(--nospam--at)att.net




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