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Concrete Slab Foundation

01/10/2012 12:54 AM

I have a storage tank with a 10,000 liters capacity, 1.5 diameter and 3 meters in height and i think its tare weight is more or less 10tons. i'm planning to construct a square pad. what thickness should a load for this concrete slab foundation?

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#1

Re: concrete slab foundation

01/10/2012 1:06 AM

WAG 150mm thick with two layers of 6 x 100 x 100mm mesh reinforcement.

The full weight might be 10 tonnes, but not the tare weight (unless way overdesigned.)

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#2
In reply to #1

Re: concrete slab foundation

01/10/2012 1:54 AM

thank you,

150mm thick concrete slab can withstand this weight?and what do you suggest if the design tank is not flat bed tank or it has a 4 leg i think 1ft. in height. can i submerged it directly in the concrete slab?

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#3

Re: Concrete Slab Foundation

01/10/2012 8:39 AM

You really need to hire the services of a qualified Licensed Structural Engineer from your area to design this foundation. Additionally, the same engineer is going to have to perform a soil investigation of the tank site, or hire a Geotechnical Engineer as a sub-consultant.

OP, sorry to inform you that we cannot provide design details for the tank foundation in here because you have not provided enough details, nor do we know the soil and groundwater conditions. Because of the size and weight of this tank there is an inherent danger involved which mandates that you hire a SE to design the tank foundation. Wind and seismic loading conditions must be taken into account in the foundation design, not just the water and tank shell loads.

We can only steer you in the right direction regarding the foundation design, not provide FREE engineering design and advice. Also, there are issues regarding engineering liabilities that prevents us from providing you the same design details.

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#5
In reply to #3

Re: Concrete Slab Foundation

01/11/2012 1:38 AM

We can only steer you in the right direction regarding the foundation design, not provide FREE engineering design and advice. Also, there are issues regarding engineering liabilities that prevents us from providing you the same design details.


There are no legal issues, unless of course your name actually is CaptMoosie?

Why not go bother Eng Tips

do us all a favor & stop posting here

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#6
In reply to #5

Re: Concrete Slab Foundation

01/11/2012 7:47 AM

Obviously you're quite unaware (or don't care) of the State Education Laws and Statutes in the 50 states (and territories) that regulate Professional Engineering. Then there's the Ethics Cannons and legal liabilities, as well as professional misconduct issues (online or otherwise....it does not matter) involved with providing erroneous and poorly misguided engineering information and dissemination, together with poorly supplied engineering advice & design criteria when one does not possess all of the necessary background information and data that's required to do so.

AP#1, additionally I strongly suggest that you visit your (or any other) State Education Dept, and fully read the laws. Also become acquainted with case laws regarding uninformed engineering, collapses, failures, errors and omissions + laymen providing engineering services and advice when one is not Licensed & Registered by any given state. This is much akin to someone practicing Medicine or Law or a CPA etc etc without the prerequisite educational background, training, skills, knowledge and the ability to demonstrate passing a required licensure board examinations(s).

AP, you are sorely misdirected, and no, I won't go bother "Eng Tips", or for that matter, any other online engineering forum or venue.

Why post as an AP, unless of course you are a chickenchit? Are you afraid that other members will ostracise you? Please, go grow an pair of brass ones buster and grow up!

I will not reply any further to your attacks, as you seriously need a reality check...

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#8
In reply to #6

Reality Foundation

01/11/2012 8:59 AM

in regards to the legal question, you miss the main point as always. In this situation there is no contract implied or otherwise, no one is compelling you to post, if you have the need to berate or otherwise abuse unsuspecting posters, perhaps you could find another way to let it out

your other point is equally as false, we are all anonymous here

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#9
In reply to #8

Re: Reality Foundation

01/11/2012 9:16 AM

Yet another misguided soul....

Nowhere in my initial posting did I abuse the OP. Get it straight, and go away pest.

In regard to anonymity on any Internet website (including this forum), that is a pure myth. Any good attorney can subpoena the records to obtain the identity and whereabouts of any registered individual.....

You never answered my question: why post in this forum under Anonymous Poster, unless you have something to hide? As far as I'm concerned you're nothing but a Troll and backbiter, and the one needing some serious and long-term psych help (geeezzz, anybody can copy and paste just about anything from the web, but do you really understand it all? Doubtful at best!). Therefore, because of your provocations, it is you that should leave the CR4 Forum.

Enough of this crappola. I've said my peace, and will not respond any further to your attacks....ya just ain't worth it buster.

Ohhhh joy.......NOT!!!!

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Anonymous Poster #1
#10
In reply to #9

Re: Reality Foundation

01/11/2012 10:13 AM

Is your legal name CaptMoosie?

While it can be helpful to be able to reference to the entire history of a member, it is not required, every thread can be considered a self contained entity.

you claim to have experience, engineering licenses. How would we be able to confirm that? Why would that matter? Everything posted here is for education & information only.

The need for professional advice is implied, you get what you pay for

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#11
In reply to #6

Re: Concrete Slab Foundation

01/11/2012 12:14 PM

So to summarize then, since he isn't building an Eiffel Tower, what he's going to wind up with is a 6' x 6' pad, with 2 layers of reinforcement, thickness being the remaining question. If it was correctly determined that 4" is sufficient for the load, 6" or even 8" could be poured to cover any discrepancies for far less extra cost for this size project than paying for professional help. Aren't poured concrete highways somewhere around 8"? If that's good enough for constant pounding by 40 ton trucks, it should be good enough for this particular project. I'm sorry if it takes work away from a PE.

By the way, nobody addressed the other part of his question but rather engaged in a pissing contest about embedding the legs or setting on the top surface. Embedding probably not the way to go due to the concentration of weight on a small area. If setting on top, a 1' x 1' x 1/4" steel plate welded under each leg should do it. I would also encourage bolting it down, particularly if it is open to the elements. There will probably be times when the tank is empty and could blow over if not secured.

Have at me boys and girls.

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#12
In reply to #11

Re: Concrete Slab Foundation

01/11/2012 12:33 PM

Off topic??????????????? Everything about my post, except for the pissing contest comment, directly addressed the topic which practically none of the other comments did. Now this is off topic. I hope you are beginning to understand the idea of off topic. If not, I can elaborate, and, Capt., you really don't want me to do that. Sorry OBO's.

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#13
In reply to #12

Re: Concrete Slab Foundation

01/11/2012 2:00 PM

Easy big fella...

You responded to a comment that was marked by the poster as OT. That makes your comment OT by default; you must deselect the OT button at the time you post your response if you believe your comment to be on-topic.

It's happened to all of us.

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#15
In reply to #13

Re: Concrete Slab Foundation

01/11/2012 6:22 PM

Wasn't aware of that mine field. If I may paraphrase a famous presonality.

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#4

Re: Concrete Slab Foundation

01/10/2012 10:35 PM

Errrrm, 1.5m diameter round tank by 3.0m high has a volume of about 5.3 cubic meters, being about 5,300 liters - nowhere near 10,000 liters. If we can't get the volume right, it's a tad early to be designing the foundation, methinks.

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#7
In reply to #4

Re: Concrete Slab Foundation

01/11/2012 7:50 AM

Agreed.........

Relativity PL has made a very valid point.

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#14
In reply to #4

Re: Concrete Slab Foundation

01/11/2012 5:42 PM

It was too evident to be detected... GA...

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#16

Re: Concrete Slab Foundation

01/11/2012 11:03 PM

It's true that this is a simple civil engineering example.

An empirical solution could be designed and implemented if ALL the site conditions were known. In other words its easy if you're there.

But we aren't. So folk here are second guessing, without malicious intent, and its the fact that the site conditions are unknown that prompted at least one respondent to advise caution and to seek local professional advice.

The question was fairly simple. The information was a bit erroneous and the site conditions were not stated or even hinted at. The OP's capabilities are cast in doubt....

A brick under each foot might even be adequate. We don't really know, do we?

I'll offer this bit of technical advice. I would urge the OP to not cast the feet into the slab during the pour as this makes for service difficulties. Use masonry anchors or weld the legs onto cast in rag plates.

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#17
In reply to #16

Re: Concrete Slab Foundation

01/12/2012 8:41 AM

...and you may need to consider some lightning grounds. Setting a metal structure that could get hit by lightning, directly into concrete can have some very bad things happen if it gets hit! Like exploding concrete!

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#21
In reply to #17

Re: Concrete Slab Foundation

01/17/2012 10:42 AM

And if it were plastic? Only the original poster hasn't said.

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#18

Re: Concrete Slab Foundation

01/12/2012 11:07 AM

With such a small tank (10,000 L or 2600 gal) your not talking about that much weight. You should easily get away with a 6 inch (152.4 mm) thick slab with steel mesh inside. The main thing is to make sure it is level. I wouldn't bother putting the legs in the slab leave them out in case you have to move the tank, and it makes it easier to put wedges under to level it out.

I have 20,000 gal tanks on compacted soil with no issues.

Good luck

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#19

Re: Concrete Slab Foundation

01/15/2012 6:22 PM

i think you are planning to build a slab to handle the gross weight with a full tank.. we will need to know what material you are storing in order to determind the proper slab design.

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#20

Re: Concrete Slab Foundation

01/17/2012 9:07 AM

If the tank were polypropylene, then consider rolled and compacted type 1 aggregate blinded with sand, rather than a concrete base. The pressure at the ground for a 3m high tank is around 1100lb/sq.ft; "wet clay" will support that and a polypropylene tank will yield slightly to the ground conditions as it fills.

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#22
In reply to #20

Re: Concrete Slab Foundation

01/17/2012 10:52 AM

see post #2 the OP mentions four 1 foot legs which would be unusual for a plastic tank of this size

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abelmh (1); Anonymous Poster (4); bakerjohn (1); CaptMoosie (4); Doorman (1); Garthh (1); Jaguar (3); johnmik (1); PWSlack (2); Relativity PL (1); Tom_Consulting (1); Tornado (1); Wal (1)

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