huangyhg

concrete tilt-up drawings
we are fairly new at designing tilt-up panels and how our drawings were set up were based on requirements from the contractor that we were teamed with. the contractor wanted to see every panel that was remotely different from the rest and wanted reinforcing, embed plates, reveals, panel dimensions and openings shown, dimensioned and called out per panel. this loaded our structural drawings with information from other disciplines that we normally wouldn't be concerned with, thus increasing our liability.
we have talked with rebar suppliers and a lifting contractor to get some comparison to what is the "industry standard". we were told we are providing the "cadillac" of tilt-up drawings. as we are now working with other contractors and including tilt-up in bid projects, we are looking to reduce our liability.
is there a standard for tilt-up drawings or what have you shown or seen on projects?

tilt-up drawings are in the same class as shop drawings for steel fabricators. consequently, all the things you mention must be shown, including diagonal control dimensions to ensure angles are correct.
needless to say, lifting points must be accurately spaced about the centre of gravity so panels don't rotate in their own plane. if they do, installation becomes a hellish exercise.
stay with your "cadillac" version and you won't have a problem with your insurance.
helmut
i agree with helmut. your cadillac construction documents will head off many potential problems.
also, i have found "dayton superior" to be a great help for tilt-up construction. in fact, they will even assist you in locating panel lift points and other extremely helpful suggestions. they also have many design catalogues that thay will be only too glad to over-night mail to you (800-745-3700).
good luck.
frank
thanks for both of your resonses. we have worked with dayton superior and they were one of the designers that said we were providing the "cadillac". our problem is that we are currently offering the client a very good set of tilt-up drawings, but that the fees that go along with that amount of effort are too high compared to our competition that draws two panels and puts all their info in a table and relies on the architectural drawings to fill in most of the blanks. we are trying to find that happy medium to remain competitive and watch our liability.
you might take the total cost approach. show them that, yes, the engineering cost is higher but the construction cost and the total cost is much lower. since you've already produced the "cadillac" drawings and presumably the project has been built. compare the number and cost of field orders, etc. between your project and stick figure project. i've also seen instances where you can see significant differences in the initial bid prices, once the contractors get to know you and begin to trust your drawings. i think that once your clients see the big picture and the total cost, they may not complain so much about your prices. it will be a hard sell to new clients but if you take the same approach and can show them real comparisons from your previous projects, you'll get enough customers.
good luck
imagineer
there are a couple of industry committees that you may wish to check out. aci-551 (tilt-up concrete construction), gary weiler current chariman [

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