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RE: pool wall design

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It has been a while since I have designed pools but there is some criteria out there regarding the slope at which support is considered -- 20 or 30 degrees or so.  This makes the weight of the wall acting as part of the outward cantilevered moment.  Support of the water pressure is assumed to be directly against the soil except for the top 2 or 3 feet and that has to be cantilevered for water pressure out (construction removal of the soil and inadequate re-compaction).  A bond beam needs to be at the top and it has to be able to span across the width of the equipment access trench to dig the pool (8 or 10 feet).  Expansive soil applies more pressure for the cantilever part of the wall and should be considered.
 
A "floating" pool (no lateral soil support) is a whole different thing.  A pool supported on piles is a real challenge.
 
A hydrostatic relief valve should be installed in the deep end so that any water pressure when the pool is empty will just fill the pool and equalize the pressure.
 
Probably local construction conventions will dictate the size and spacing of rebar but usually it is somewhat close at the bottom and is cut off part way up.
 
You should check regulations for depth when there is a diving board and be sure you are covered there.  You should also have structural details for the light box and filter boxes.
 
This information is about 20 years old and there may be some other things that I have forgotten to include.  If you are only going to do one or two (see Stan's post) I would recommend that you don't do it.  If you are going to do lots of them then it is worthwhile to do a lot of checking first and make up your fee on the repeat ones.
 
If you get into the mechanical aspects, i.e. size of pumps, etc. be sure to do your homework because there are limitations and restrictions.
 
HTH
Jim Persing
-----Original Message-----
From: Pat Clark [mailto:bcinc(--nospam--at)nanosecond.com]
Sent: Thursday, November 13, 2003 10:21 AM
To: seaint(--nospam--at)seaint.org
Subject: pool wall design

 
 
I am looking for additional references on designing pool walls.  We have started by analyzing these walls as cantilevered retaining wall, but this does not consider the curvature at the bottom of the pool, and additional hardened overcoats on the pool walls, etc. Also, any input for my specifications about leaving pools in a drained conditioned, etc. would be greatly appreciated.
 

Patrick Clark, P.E.

Building Concepts, Inc.

1228 Pep Circle

Gardnerville, NV 89410

(775) 782-8886 x22

(775) 782-8833 fax