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Old 08-09-2010, 01:31 PM   #1
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Intex Pool goes underground


Hello experts

We recently purchased an Intex round pool (18 foot by 4 inches) and it is now sitting above ground in an 1 foot inclined backward.
I was thinking about moving it underground with the following plan:
1) Dig a 19 foot by 4 1 inches deep in mirroring the round shape of the pool
2) Construct a wooden crate in a dodecahedron format (same as the outside leg shape of the pool) and lowering it into the ground hole dug by step 1 above. Plum the floor with sand before lowering the crate.
3) Construct two dodecahedron-shape French drain system in PVC (one for the inside of the crate facing the pool, the other for the outside of the crate facing the dirt). These systems would interconnect at the French drains (two, one in each cavity of the crate) and filled above with gravel (2 4 inches) and sand (2 6 inches). See figure two for a cross section of the box.)
4) Install the drain system at the box making sure the drain is higher at the corner facing the deck and lower at the corner facing the fence for better flow of refuse water.)
5) Install two inversed T shaped pipes made of PVC for draining the pool. One at each side of the pool and connect these to the drain system of the pool. The top of the T would have a valve that would allow the opening/closing for draining. One side of the drain system would move the water into the alley from under the fence up until about 1 foot high then Archimedes law kicks in. The other side will then be opened and a pump would bring up the rest of the water for full drainage of the pool.
6) Lower the wood structure and connect the hoses for the drains using clamps. Erect the pool inside the crate making sure the feet are plum and the liner is straight at the bottom.
7) Add gravel both sides of the create starting from the French drains to about 3 inches or so and continue across the perimeter of the dodecahedron about 1 inch higher. Fill in with sand to about 4 inches on top of the gravel and leave the cavity as is at the internal side; at the external side fill in with sand until the top of the wood crate.
8) At the side next to the fence crate a box for the filter and pump and lower the equipment to the box; both equipment sit on their own plastic pedestal but do install these on a pavestone above the box for drainage. Connect the equipment into the electric system via cable ran on a PVC tube across the border of the deck into GFCI wall plates.
9) Add pavestones across the lip of the box to create a neat finish.

Figure one shows the view from above of the project and figure two shows the cross-section for the drains.
Now experts, do you see any flaw in my plan? Any feedback is super appreciated J
Attached Thumbnails
Intex Pool goes underground-figure-1.jpg   Intex Pool goes underground-figure-2.jpg  

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Old 08-09-2010, 03:05 PM   #2
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Intex Pool goes underground


A wood crate wall will rot out in short time
Any carpenter ants or termites will soon chew it up
Between that & moisture it will not last long IMO

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Old 08-09-2010, 03:27 PM   #3
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Intex Pool goes underground


Quote:
Originally Posted by Scuba_Dave View Post
A wood crate wall will rot out in short time
Any carpenter ants or termites will soon chew it up
Between that & moisture it will not last long IMO
Sorry I did not explicitly stated pressure treated plywood. I have the same wood sitting as flooring for my shed for 5 years and it is yet to show any signs of issues. So I figured it would be good enough to be the crate, especially since the walls are isolated from the dirt by 2 - 3" of playing sand compacted (figure 2 ..).
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Old 08-09-2010, 08:29 PM   #4
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Intex Pool goes underground


Well that changes everything
The PT will cause the alum to corrode
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Old 08-10-2010, 06:04 AM   #5
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Intex Pool goes underground


It would it if gets into direct contact, which it does not. The foot of the post is capped and the leg will sit surrounded by a foot of gravel + sand at the bottom thus making it kind of isolated from the crate. Eventual shifts would get a touch here and there but nothing of substantial contact.
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Old 06-05-2011, 08:34 AM   #6
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Intex Pool goes underground


I wonder how this ever turned out.

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