reinforcing bar positioner requirement

[inspjerry]

I keep hearing reinforcing bar positioners for masonry mentioned in the ACI 350, but cannot find them anywhere,and I am unable to find any refrence to them in the new 2003 IBC. Anyone tell me where the requirement is?

 

[rrmiv]

ACI 530.1 Section 3.4 states that rebar shall be secured as to "prevent displacement beyond the tolerances allowed". The corresponding commentary section shows some typical rebar positioners. I don't see where a spacing requirement is given, but we specify a maximum spacing of 200 bar diameters.

 

[inspjerry]

Yes, but the new 2003 IBC states somewhere 112 bar diameters.