Load bearing weight for a precast concrete tank???

paddy147

Would anyone know the max load bearing weight for a 6000 litre underground precast tank lid??


Would the 5.5 inch thick precast lid cave in under the weight of 10 inches of soil being layed and leveled over it??

Would this area be safe for a person to walk over/accross?


Thanks.:)

sky6

There's plenty of Concrete Septic Tanks covered over without any problems.
Even being driven over by Tractors and Motor Mowers.

What is the size and area of the Lid. Does the Lid have any reinforcing in it ?
The best people to ask is the Manufacturers of the Tank. I'm sure it is something they would have taken into account when designing them.
What you can do is take a sq foot of 10 inch soil, put it in a Bucket soak it fully with Water and then Weigh it. This weight would then represent the heaviest natural load per sq foot. You can then compere against the Manufacturers ratings.

paddy147

sky6 wrote: »

There's plenty of Concrete Septic Tanks covered over without any problems.
Even being driven over by Tractors and Motor Mowers.

What is the size and area of the Lid. Does the Lid have any reinforcing in it ?
The best people to ask is the Manufacturers of the Tank. I'm sure it is something they would have taken into account when designing them.
What you can do is take a sq foot of 10 inch soil, put it in a Bucket soak it fully with Water and then Weigh it. This weight would then represent the heaviest natural load per sq foot. You can then compere against the Manufacturers ratings.

Tank and lid are 2.20 meters in diameter.

I honestly dont know if their is any reinforcing/rebar in the tank lid?


I might call the company and ask in the morning.


Thanks for the advice regarding the soil aswell.:)

ted1

If its for rain harvesting you can get good plastic tanks that take plenty of weight, my brother got one fitted recently

paddy147

ted1 wrote: »

If its for rain harvesting you can get good plastic tanks that take plenty of weight, my brother got one fitted recently

What tank did he get?

Was it a Graff/JFC underground plastic tank/system??

Thanks.:)

paddy147

sky6 wrote: »

There's plenty of Concrete Septic Tanks covered over without any problems.
Even being driven over by Tractors and Motor Mowers.

What is the size and area of the Lid. Does the Lid have any reinforcing in it ?
The best people to ask is the Manufacturers of the Tank. I'm sure it is something they would have taken into account when designing them.
What you can do is take a sq foot of 10 inch soil, put it in a Bucket soak it fully with Water and then Weigh it. This weight would then represent the heaviest natural load per sq foot. You can then compere against the Manufacturers ratings.

According to the company,,,the tank is supplied with a 150mm thick lid and the tanks/lids are made with concrete of 50nm.


Havent a clue what that means though??

ted1

paddy147 wrote: »

What tank did he get?

Was it a Graff/JFC underground plastic tank/system??

Thanks.:)

No his is more rectangle so didn't have to go down to far, here's a blog on the construction you can see it in some of the photos.

http://www.jharchitecture.ie/category/south-dublin-ext-refurb/

paddy147

ted1 wrote: »

No his is more rectangle so didn't have to go down to far, here's a blog on the construction you can see it in some of the photos.

http://www.jharchitecture.ie/category/south-dublin-ext-refurb/

Thanks.:)

paddy147

ted1 wrote: »

No his is more rectangle so didn't have to go down to far, here's a blog on the construction you can see it in some of the photos.

http://www.jharchitecture.ie/category/south-dublin-ext-refurb/

Would you know the make of the tank and its size and capacity?

Also do you know how deep down the excavation was to install it??

Thanks.:)

ted1

Its a 3000 litre tank. not sure of the make or model but if you email the archetict he may know.

If you look at the picture you can see the tank but beside it you can see the man hole/service hatch, this sits directly under the patios slab and sits a bit above the tank so its a couple of inches deep.

its fairly stong and i reckon they ccould have goen down deeper if needed.

here's a link with a smilar system, i think its the same tank as my brothers. http://www.rainwaterharvesting.co.uk/flat-tank-gravity-feed-rainwater-harvesting-system-3000-litre-duk4.php

paddy147

ted1 wrote: »

Its a 3000 litre tank. not sure of the make or model but if you email the archetict he may know.

If you look at the picture you can see the tank but beside it you can see the man hole/service hatch, this sits directly under the patios slab and sits a bit above the tank so its a couple of inches deep.

its fairly stong and i reckon they ccould have goen down deeper if needed.

3000 litres???....looks bigger than that..........Is it a shallow excavation then?


Id be going for at least 5000-6000 litres (to make most of my entire roof space)....as a 4-6 person family home (futureproofing) will use quite a bit of water.

paddy147

ted1 wrote: »

Its a 3000 litre tank. not sure of the make or model but if you email the archetict he may know.

If you look at the picture you can see the tank but beside it you can see the man hole/service hatch, this sits directly under the patios slab and sits a bit above the tank so its a couple of inches deep.

its fairly stong and i reckon they ccould have goen down deeper if needed.

here's a link with a smilar system, i think its the same tank as my brothers. http://www.rainwaterharvesting.co.uk/flat-tank-gravity-feed-rainwater-harvesting-system-3000-litre-duk4.php

Just saw that you added a link.

Thanks for that.:)

paddy147

ted1 wrote: »

Its a 3000 litre tank. not sure of the make or model but if you email the archetict he may know.

Any chance you could PM me the email address for the architect?

Thanks.:)

tred

paddy147 wrote: »

Any chance you could PM me the email address for the architect?

Thanks.:)

funny id feel better driving over the concrete tank than the plastic one!

paddy147

tred wrote: »

funny id feel better driving over the concrete tank than the plastic one!

No one will be driving over it...as it (what ever tank I opt for) will going into a back garden.

And the only thing going over it will be some soil,some people (me,missus and daughter) and our ducks.:D

sky6

50 nm is the Strength of the Concrete used in the lids. Foundations are usually 30n So it sounds good to me for walking on.