
Originally Posted by
highangle
8 hundredths error between bents is HUDGE on a bridge. Especially a bridge with battered piles supporting a vertical curve. Precast stringers or red iron, if your anchor bolts are out an inch, you are Officially fuckt. Hope you brought your checkbook.
Standard tolerance for dirtwork is a tenth of a foot or so, depending. I've set slope stakes to .01', but only for the $$.
The "finished grade" is usually set to .02', about 1/4 inch, or 6mm. Bridges are spec'd tight as a cat's ass. It's just numbers for a designer or cad driver, but 2/3 of a field crew's time is going to be spent checking what they did on the first third of a job like a bridge because of those extra significant figures.
To make this about the topic, a professional earns his keep. An architect should bring value to his client well beyond what he costs. Good ones can do it just with their names.
Preaching to the choir my man. But if you think errors on bridges don't occur and get "field fixed" then we need to hang out and I will tell you some stories

The potential for millions and millions of impact on the error on this one for example was avoided by some creative engineering on a cocktail napkin of which I am not going to go into on the inter webs.
And I totally agree, every professional in the industry should be bringing far more value to the table than the fee they charge.
Samuel L. Jackson as Jules Winnfield: Oh, I'm sorry. Did I break your concentration?
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