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Old 06-10-2008, 05:06 PM   #16
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Concrete pad questions


This actually isn't a project that I bid on.
How this works is that the neighborhood gets together and petition for a cluster box to be installed in the area and all the post office does is approve/disapprove the location. We do EVERYTHING from sourcing the actual boxes and materials to the construction of the pad (they give us the specs) and yes, to shelling out the money for all the cost. So the PO doesn't have an investment on this at all, we do.

There's actually only one guy who contracts out these projects and he does really shoddy job and charges an arm and a leg for this which is why we decided to DIY or in this case DIO (DO-IT-OURSELVES). Only, since I'm the unofficial "organizer", I'm left with figuring these things out.

So if it sinks, we (neighborhood) pay for it as well. Oh what did I get myself into????
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Old 06-10-2008, 07:31 PM   #17
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sh**, that changes things, then 8" thick - 1 contraction jnt 1/2way, 1 mat #4 or #5 bar 12" o/c both directions,,, cool !!!!!!!!!!!!!!!!!!
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Old 06-10-2008, 07:49 PM   #18
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sh**, that changes things, then 8" thick - 1 contraction jnt 1/2way, 1 mat #4 or #5 bar 12" o/c both directions,,, cool !!!!!!!!!!!!!!!!!!
Thanks!
I think I got it all except what does 12" o/c both directions mean???


So I talked to the PO again and asked why the 12" rule. And apparently several years ago, a child was hanging of from one of these boxes and uprooted the entire structure and crushed the kid. That's why they require a minimum of 12" depth now.
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Old 06-11-2008, 06:05 AM   #19
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12" on center,,, in 10' you'll have 9 pcs of steel laterally spaced 12" apart,,, longitudinally, you'll have 4,,, hold back the steel 4-6" from the edge of the conc.

i'm sure there's been a mail carrier who's lost his/her life in 1 of the little jeep-likes,,, using their logic, why don't all carriers use sherman tanks ?,,, but it is what it is - good luck
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Old 06-12-2008, 10:34 AM   #20
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Concrete pad questions


There's no way a child is going to up-end an 8" thick 10'x4' slab by hanging on the box. If the box isn't securely fastened to the slab the box itself may up-end but then it wouldn't matter if the slab was 12" thick or 12' thick. 8" is plenty thick.
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Old 06-12-2008, 10:54 AM   #21
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agreed, jog, but the usps's got higher cards for this hand than the neighbors,,, while they may not come out to measure the depth, if this base EVER tips, it'll be much more difficult adding more conc then to make it 12"
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Old 06-12-2008, 11:09 AM   #22
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I guess a half yard more concrete is pretty cheap insurance that no one will ever be able to question whether the installation was to spec.
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Old 06-23-2008, 06:37 PM   #23
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Concrete pad questions


Thanks again for all your replies.

So a couple of days ago the PO called me and told me of the change in spec. We could do an 8" depth of pad now, which is what we are going to do.

So is it ok to place the rebar mat 3" above the ground (using rebar chairs) or does it need to be higher/lower?


On another note, if we were to reinforce a concrete footing (12"diameter, 4' deep) with rebar, how do we position the rebar? Do we need a rebar mat for this? If so, how would that look like?

The footing is to be used for bolting a bumper post to it, similar to this
http://www.globalindustrial.com/imag...ge/652899M.jpg
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Old 06-24-2008, 06:49 AM   #24
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Concrete pad questions


all specs call for the remar mat to be mid-point vertically +/- 5%,,, for YOUR purpose, that's 4" we'd use conc bricks OR ' chairs '

on the bollard, we'd just drop in 5 or 6 pcs of #4 bar
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Old 06-24-2008, 12:03 PM   #25
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on the bollard, we'd just drop in 5 or 6 pcs of #4 bar
thanks again!
how long should the bars be for the bollards?
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Old 06-25-2008, 05:00 AM   #26
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grumpy, this is takin' more time than it should actually want the steel ending w/2" or 3" of conc ' cover ',,, what this does is prevent any weakness leading to cracks due to steel & puts the steel away from water which'll penetrate conc to an extent,,, btw, think aci list's 5,000psi conc as ' waterproof '
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Old 06-25-2008, 12:37 PM   #27
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thanks again!
i think we'll be ready to pour next week.
wish us luck!
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