Platform Slab Penetrations

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We will be constructing a concrete electrical building on drilled piers in the flood plain. The floor of the electrical building will be about 5 feet above grade. Conduits will enter the electrical building from underground. Soil conditions are such that conduits below the electrical building will settle over time. We originally planned to sleeve conduits through the concrete floor beams but we find the sleeves take up too much of the conduit window into the switchgear. Is there something we can wrap around the PVC coated rigid steel conduits that will allow the conduits to slide down through the concrete if the conduits drop a few inches due to settlement of the soil?
 

Smart $

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Location
Ohio
Have you considered using a cement-stabilized sand backfill? Or is it that the bottom of trenching below is not undistrubed soil?

How are you penetrating the floor... core drill or other method (elaborate on the latter)?
 
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Have you considered using a cement-stabilized sand backfill? Or is it that the bottom of trenching below is not undistrubed soil?

How are you penetrating the floor... core drill or other method (elaborate on the latter)?

Piers are drilled, duct banks run and risers set, slab is formed on top of piers and poured in place with conduits "roughed in" from a concrete encased duct bank.
We expeience settleing of the duct banks.
 
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Smart $

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Location
Ohio
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