David Fisher wrote:
>
> Good advice, sir…
>
> "Thor's pool"….sounds like he should be battling Namor for control of
> the Deep.
>
> J
>
> David L. Fisher SE PE
>
> Fisher and Partners - Cayman
>
> 372 West Ontario Chicago 60610
>
> 75 Fort Street Georgetown Grand Cayman BWI
>
> 319 A Street Boston 02210
>
> 312.573.1701
>
> 312.573.1726 facsimile
>
> 312.622.0409 mobile
>
> www.fpse.com
>
> ------------------------------------------------------------------------
>
> *From:* Andrew Kester, PE [mailto:akester@cfl.rr.com]
> *Sent:* Saturday, January 31, 2009 11:43 AM
> *To:* seaint@seaint.org
> *Subject:* re: thor's pool
>
> Thor,
>
> I think you have several things to consider with this project, which
> you may already be doing. The existing foundations of the house if
> within a certain distance (and depending on your soil) will put a
> lateral suracharge load on the wall of the pool. Also, you may have to
> give the contractor some shoring direction to avoid settlement issues
> with the existing house. I would include a preliminary site visit to
> review the existing wall and take lots of photographs and document any
> exterior and interior cracks, just in case down the road they start
> making lots of claims. I don't know the existing home construciton.
>
> Also, in Florida, it would be very unusual I think to use the concrete
> deck as an apron. These are typically placed after the entire project
> is done, and are simply a slab-on-grade with a textured "cool-deck"
> topping. More popular now is the use of concrete pavers. If the owner
> wants a concrete deck and you can get them to OK your idea, then I
> would certainly explain to them this is structural element and cannot
> be removed ever (and note that on your dwgs). You may want to recess
> the structural concrete apron a few inches from the finished top edge
> of the pool so they can place a non-structural cool-deck topping or
> even a layer of sand and thin pavers.
>
> My conclusion as well as any others (as previously stated) on this
> list is pool design is not an exact science, but somewhat of a mix of
> science and art. If the pool is non-rectangular it will behave more
> like a circular water tank and the pool water will balance out the
> soil pressure and put the reinforcement in tension. But I don't see
> how in a rectangular pool the walls, at least while being constructed
> and empty, do not act like cantilevered walls.
>
> And I have seen several pools pop out of the ground when partially
> emptied during a storm event because of a high water table. One was up
> two feet and took the deck with it, the whole thing was a total loss.
> As mentioned by others, they do have valves that are supposed to pop
> and allow groundwater to enter the pool to balance the hyrdostatic
> pressure. But if you design it not to float in the empty condition
> with a high water table, and simply add mass in the form of lots of
> concrete, I would expect you will have a very angry homeowner and
> contractor...
>
> Conclusion- I don't touch swimming pools, seems like a no-win. Good
> luck, and let us know what you come up with.
>
> "I guess i should. i'm in soft rock and th 9' end is against the ex.
> house:
> ...
> Thor
>
> HTH,
>
> Andrew Kester, P.E.
> Orlando, Florida
>
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