Will
On Apr 12, 2009, at 8:06 AM, "Rick Stone" <rstone@madisonconcrete.com>
wrote:
>
> Conduit in topping---I would be concerned with three things--none
> really
> diaphragm-related....
> 1. The topping may want to crack at the conduit, as that represents a
> weak point in the topping and shrinkage of the topping as it cures and
> dries may result in a crack there. The residents in a correctional
> facility find pretty amazing ways to destroy things, and cracks are a
> great place to start chipping away at something.
> 2. If there is a crack, how it gets repaired is an issue--the guests
> love to chip urethane or silicon fillers out and eat it to get
> whatever
> high is available. Most correctional facility "owners" take this very
> seriously--they do not want this. Once the filler is removed, what
> happens in 1. above gets easy to do.
> 3. They also are adept at getting to the conduit, chopping through it
> and causing mischief with the wiring inside. The crack is a great
> way to
> start getting to it.
>
> I agree with Harold--if it is indeed single span, why not see if it
> can
> be stuffed in the voids? Or cast in the mold? I do not think that you
> can do this with extruded pieces, though. Structurally, you
> diaphragm is
> probably OK with the edge joints grouted well--there is lots of info
> in
> the literature to support that. We have done may such facilities and
> usually all conduit is run in bond courses in the CMU walls.......
>
> Good luck!
>
> Richard W. Stone, P.E.
> Project Executive
> Technical Services/Project Management/Estimating
> Concept Design/Engineering/Quality Assurance
>
> Madison Concrete Construction Company
> 130 Quaker lane
> Malvern, PA 19355-2479
> email: rstone@madisonconcrete.com
> Voice: 610.695.8800
> Facsimile: 610.695.8678
>
> Nextel: 610.496.5764
>
>
> Visit our webpage at www.madisonconcrete.com !!!!
>
>
>
>>
>> ------------------------------
>> Date: Thu, 9 Apr 2009 19:01:02 -0400
>> Subject: Hollow Core Topping and Conduit
>> From: gtg740p@gmail.com
>> To: seaint@seaint.org
>>
>> I have some 3/8" diameter conduit that needs to be run perpendicular
> to t=
> he
>> hollow core slab units (perpendicular to the cores) for the entire
> width =
> of
>> the building. The conduit cannot go below the HC and the HC is 6"
> thick w=
> ith
>> 2" of topping. I don't want to mess up the HC diaphragm topping slab
> but =
> I
>> don't see any other way to run this conduit and it cannot be placed
>> above the topping slab either. Any ideas on how I can still get the
>> diaphragm shear transfer if the conduit is embedded in the 2" topping
> sla=
> b?
>> I am using a heavy welded wire mesh in the topping slab for the rest
> of t=
> he
>> diaphragm.
>>
>> Will H
>>
>> ---
>
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