Tolerance on Strand position

[MHobbs]

Anyone have a guidance on setting tolerance limits for wire position in precast members?
At the moment my instinct is to set a tolerance allowing for increased effective depth in the section but not a reduction from the designed value.

 

[bugbus]

In Australia it is typically 5 mm tolerance for the position of individual strands.

Precast suppliers will have accurate templates for laying out strands. I would count on the actual tolerance being pretty close to zero.

 

[MHobbs]

Thanks for the reply I've been digging and the American precast/prestressed institute sets similar tolerances of 6mm (1/4 inch for them)
I'm UK based and I can't find any thing in writing but it seems the standard will be 5mm