Rebar - Floor Pad
Rebar - Floor Pad
(OP)
We have a combustion chamber/boiler - probably weighs about 60,000 lbs - that is to be placed on a concrete pad.
We were given back a plan view drawing showing the rebar placement. For the entire boiler room the spacing is 12" apart, but right at the feet of the chamber the spacing is 20". The feet on the chamber are somewhere between ~16"-18" square. They seem to stress the importance of this increased spacing too.
Why is rebar spaced further apart at this point than everywhere else? I would think that at the loading points the rebar would be closer together. I am just curious, we do not do concrete and are rarely even shown the drawings so I am not saying this is wrong but I do find it interesting.
We were given back a plan view drawing showing the rebar placement. For the entire boiler room the spacing is 12" apart, but right at the feet of the chamber the spacing is 20". The feet on the chamber are somewhere between ~16"-18" square. They seem to stress the importance of this increased spacing too.
Why is rebar spaced further apart at this point than everywhere else? I would think that at the loading points the rebar would be closer together. I am just curious, we do not do concrete and are rarely even shown the drawings so I am not saying this is wrong but I do find it interesting.






RE: Rebar - Floor Pad
RE: Rebar - Floor Pad
The only thing I can think of for the increased spacing is if holes for anchors are going to be drilled after the concrete is poured, so less likely to hit rebar when drilling? Are the feet going to be attached to the slab?
RE: Rebar - Floor Pad
Yes, the slab is on grade.
Aggie,
We do used anchors in the floor so that could be why. Perhaps if they were to plan the rebar to be a safe distance inside the anchors the rebar becomes too close together - if that's possible.
RE: Rebar - Floor Pad
RE: Rebar - Floor Pad
This is not critical as our job is the boiler, I was really just curious and wanted to hear your opinions. If I get the chance I will ask the guy who did the design, but that may not happen.
Look forward to hearing any other thoughts though.
RE: Rebar - Floor Pad
RE: Rebar - Floor Pad
The floor is thicker under the chamber - thickness increases from 6" thick to 12" thick. The rebar is 12" oc under the chamber and 20" apart around the support legs.
RE: Rebar - Floor Pad