Mat Foundation for ATM Machine

[oengineer]

I have been tasked with designing a foundation for an ATM machine. Where the ATM is located at, I have 1500 psf max allowable soil bearing at 2 ft below grade. I plan on making the foundation at least 2 ft thick from grade. I am basing the design of my foundation off of a Dash 2000 ATM pad with canopy. How much the mat should extend above grade? I was thinking of just calling out 6 inches above grade. Do I need to determine the base flood elevation or is there something else I have not considered? All suggestions/comments are appreciated.

 

[MotorCity]

I am not sure what your canopy-atm arrangement looks like but a 2' thick mat sounds like way over kill. The ATM can probably sit on a 4" thick pad and if you are in a frost region, the canopy can probably sit on small pad footings or grade wall. That said, if you do provide a 2' thick mat you have addressed the potential flood issue, as concrete is denser than water and will not float.

 

[SlideRuleEra]

Are there any security concerns that would affect the anchorage of the ATM to the foundation? Say, having anchor bolts embedded deep enough to minimize the chance of someone connecting a powerful truck to the ATM and pulling it off the foundation then dragging it away in the middle of the night. Have heard of this sort of crime happening.

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[JGard1985]

Sounds like a fun project, don't forget to include the forklift uplift load too...

http://www.huffingtonpost.com/2014/09/11/stolen-forklift-atm_n_5805116.html

Jeff
Pipe Stress Analysis
Finite Element Analysis

http://www.xceed-eng.com

 

[SlideRuleEra]

JGard1985 - Looks like both of us were thinking along the same lines at the same time.

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[JoelTXCive]

Oengineer -

Is this a drive up ATM or a walk up ATM?

For both cases, the ATM machine manufacturer might specify a desired machine height above grade.

For example, on a walk up machine, maybe they want the buttons 36" above the floor/grade so that someone in a wheelchair can use.

If it is a drive up ATM then maybe there is a magic number where the majority of cars can access? I know a US Mailbox is 41" to 45" above the road surface.

If available, I would see if the proposed machine has any specs, and then work backwards.

 

[oengineer]

I was going to use Hilti bolts to anchor the ATM foundation.

This a drive up ATM.

Here is a layout of the ATM:

http://files.engineering.com/getfil...-9f71-fce70fbea365&file=PAD-2000_w-canopy.pdf

Here is the elevation view:

http://files.engineering.com/getfil...350-da68bb4338c1&file=2Post-light-Canopy..pdf

 

[spieng89]

I agree with Joel. Look into the requirements of the ATM manufacturer and/or bank so that the machine is compliant with accessibility requirements. Even if it's a drive-up ATM, people would still walk up to it and it might need to be ADA compliant. You could use a turn down slab/foundation if you have frost depths you must meet and still keep the slab itself rather shallow.

 

[oengineer]

I spoke with a manufacture that I based my design on (the attached sketches). He said 6 inches above grade for the bottom of the ATM is good.

 

[oengineer]

Would anyone happen to know what is a typical light pole vendor to be used for drive-thru ATM Cul de Sac? I am looking to design a light pole foundation as well.