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Picture of Sunken Trampoline

Hello,

We came across a trampoline that someone was giving away as they no longer needed it and thought that this would be a nice addition to our garden for our children to enjoy. Our only problem was that we have never enjoyed the look of a trampoline sitting in a garden or the care needed if you experience high winds. After some browsing online we discovered a nice way to incorporate it with your garden and remove some of the drawbacks of a standard trampoline.

Dig a big hole and leave it sitting flush with the ground providing easy access, enjoyable bouncing experience and somewhere to sunbath when the kids are at school. Sounds simple, right?

Step 1: Materials and Tools,

Picture of Materials and Tools,

For this there would be much simpler ways to go about sinking your trampoline but i used what I had on hand and is an inexpensive way of doing it (and gave me a good few nights of sleep afterwards).

Tools:

Spade

Rake

Wheel barrow

Small metal fence (used as a sieve for the larger pieces of soil)

Materials:

Standard trampoline (just under 10ft)

100mm by 30m Damp proof course (any bit of thick plastic can be used to help retain the soil would be fine this was just what i had on hand.)

Wooden stakes (pressure treated)

3" pipe (to allow the air to escape)

blkhawk1 month ago
I worked as an insurance inspector for some time and were told to mark trampolines as a property risk. After finding your project, I don't know what to make of it. Maybe filling the hole with rubber mulch could prevent an accident if the mat rips.
techydiy4 months ago
Good job, we have had a trampoline for 9 years, it was easily the best investment I have made. I have to say though the retaining wall scares me.
DanF1474 months ago
I hope you will remove the rocks or install a safety net. Accidents will happen.
Better be safe than sorry.
Cliffsclips (author)  DanF1474 months ago
Hello Dan, thank you for your concern but we have built a small retaining wall just under the 100cm that trampoline guides give you for positioning it in your garden. At the moment our children are very light so they don't manage to bounce that high, as they get older and more confident we might look into installing a safety net.

Thank you for reading.
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Build-Bot4 months ago
Really nice project - and you did a great job documenting it too!
Cliffsclips (author)  Build-Bot4 months ago
Thank you for the kind words.
huntwa4 months ago
Looks really cool! I'm guessing you don't get much rain in your area? Do you have any sort of drainage system in place, or do you just shop-vac it out?
Cliffsclips (author)  huntwa4 months ago
Thank you. We get our fair share, but from what i had read as long as you dig a large enough drainage hole it shouldn't ever be a problem (he says with his fingers crossed).
OK I get it, so you're counting on some fast infiltration through the soil at the bottom of the hole. That could work unless there's some heavy rainfall. I bet running and jumping across that trampoline is a blast! It probably launches you twenty feet across the yard at least.
allangee4 months ago
I've seen one of these first-hand (coworker and neighbor). It slowly filled with water due to soil conditions and the fact that the trampoline itself hindered evaporation. It wasn't uncommon for them to find dead and bloated frogs and mice right under where the kids were bouncing. You'll definitely need to determine how well your soil percolates or, even better, line the bottom and put a small pump at the lowest point. Even a garden pond pump should suffice. Also be aware that if you keep it nice and dry underneath, there are animals that would find that an ideal place to hide out and might be upset once kids start bouncing on their ceiling.
jeanniel14 months ago
Wow, this is probably safer than the tramps that are above ground with nets! I guess maybe still need some sort of railing or something to prevent folks from stepping between the springs. Still, what a great idea and a whole heap of work digging! Thanks for sharing
Cliffsclips (author)  jeanniel14 months ago
Thank you, it is good and the green foam mat can be stood on but i would advise jumping on it.
funman14 months ago
Where will the water go when it rains?
That's what's always stopped me from doing this was, that it will fill full of water when it rains like a pool.
Cliffsclips (author)  funman14 months ago
Hello, from what i understand from reading about other trampolines as long as the drainage hole in the bottom is deep enough it will just drain away like rain water does on your lawn.
KingAveGarage4 months ago
This is a good idea, especially for yard appeal. But where does rain water go?
Cliffsclips (author)  KingAveGarage4 months ago
That is good of you to mention it as I forgot to say. In one of the pictures you can see that there is rocks in the bottom. this was an extra hole i dug out and filled with rocks and gravel to give it some where to drain. this is about a foot deep and into the sub soil level.

I will amend to original instructable to mention this, thanks for the heads up.
jessyratfink4 months ago
That looks so good! Great that you could use the soil to even out other areas, too :)
Cliffsclips (author)  jessyratfink4 months ago
Thank you, It is a good job as I am not sure what I would have done with it all.
Cliffsclips (author) 4 months ago
This is the front lawn which will filled with some of the top soil from the above project.
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