Concrete Piping and or Tubes for Foundation

[68Camaro]

Ive contacted a concrete contractor in reference to having a foundation built for a 26x26 garage. He told me since It was on a grade and would need fill added he was going to need to put "Piping and or Tubes" with rebar in the floor. Im not exactly sure what he means and cannot find any info or photos of these on the internet. Anybody know what he means? I can't contact him again until tomorrow and Im anxious to understand what they are. Thanks

 

[The Cobbler]

wonder if he means pile drives?

 

[Renegade1LI]

I would ask the contractor for a more detailed explanation of what they are proposing followed by a written estimate.

 

[ericm]

In our area due to earthquake and landslide hazard, a common foundation is "pier and beam". The piers are drilled down to bed rock and filled with concrete, then beams are cast across them to form the perimeter of the foundation. For a garage there's a slab poured inside.

 

[ConCretin]

I'm not familiar with the soil conditions in Georgia but some research on your part should precede construction especially if your contractor is suggesting anything other than a traditional foundation design. I'd start with your code enforcement officer and move on to a structural or geotechnical engineer.

Piers or pilings are fine but they need to be able to support the load and everything above needs to be able to carry the load back to them. It's not as simple as it may sound. Given the relative bearing area, traditional foundations and/or slabs have a lot more margin for error.

 

[gsmith22]

you don't build on fill (unless you want settlement) so he probably means something like the other posters indicated - some type of piers supporting grade beams or maybe sonotube like "concrete piles" supporting the footings, etc. Even if you compact engineered fill in 6" lifts to 95% modified proctor and followed all procedures, you are still going to get some settlement because nature over millenia is much better at compacting the humans could ever be

 

[dcg9381]

I think he means "piers". I built a residential garage on what was "old road spoils" - and it turned out to have too many large boulders / pieces in it that contributed to instability. Choice was to install piers or remove the "hill" and build it back with suitable material....

Concrete guys had some big *** drill, basically went down 10'. We installed about 8 piers on top of the typical concrete beams. They used a circular rebar in the piers... Not cheap.

 

[Orionrising]

May mean a post tension slab.

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