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Concrete block foundation

 
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Kaustubh Vaishnav
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Joined: 07 Apr 2010
Posts: 109

PostPosted: Tue Apr 20, 2010 6:29 am    Post subject: Concrete block foundation Reply with quote

Dear all
Need your help in designing a fondation for Transformers
Transformers having weight 6-7 Tonnes,
Present practise is to use RCC transfomer plinth with columns, beams & slab,
I just want to know

Whether concrete block foundations are suitable in this case?

Concrete block foundations will take load of transformer?

In which case more quality control is required at site? RCC or concrete blocks

Which one is cost effective solution? RCC or concrete blocks

Is their any other alternative?

Attaching drawing for transformer plinth for your reference.

Thanks & Regards
Kaustubh
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suraj
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Joined: 17 Apr 2008
Posts: 1981
Location: NCR Faridabad, E mail suraj_engineer@yahoo.co.uk

PostPosted: Thu Apr 22, 2010 4:16 am    Post subject: Transformer Foundation Reply with quote


Transformer Foundation<xml><o></o>

Please use Discussion Forum for technical questions as all would respond<o></o>

<o></o>

International practise is to use ordinary thick block of RCC say 1 x 1x 1.2 m depending on the size of transformer with nominal reinforcement.It would be a cost effective solution when the transformer is to be placed on ordinary height enabling placing the foundtion on or near ground.<o></o>

Load indicated is also too small & can be easily managed.<o></o>

Transformer foundation shall not be subject to moments @ ordinary level.<o></o>

Regards<o></o>

<o> </o>

_________________
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IntPE(India)Suraj Singh FIE Civil
Engineering & Arbitration

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Kaustubh Vaishnav
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Joined: 07 Apr 2010
Posts: 109

PostPosted: Thu Apr 22, 2010 6:09 am    Post subject: Re: Transformer Foundation Reply with quote

Dear sir
We are placing the transformer not on ground.
we are placing on transformer plinth. Which is resting on foundation.
As you are suggesting RCC block it will more heavy as ht requirement is more.
Means we have to keep the transformer about 2.8-3.0 m ht from foundation top.
My problem was
1. Is it posible to use concrete block masonary fnd. for that ht i.e 2.5-3.0m?
2. Whether it will take load of transformer, considering vibrations.
3. In which case more quality control required ?( In case of RCC or block fnd.)
Plz guide me for proper solution, because my boss is saying tht for better quality
control we are practising RCC transformer plinth. Is it true?
KAustubh


suraj wrote:


Transformer Foundation<xml><o></o>

Please use Discussion Forum for technical questions as all would respond<o></o>

<o></o>

International practise is to use ordinary thick block of RCC say 1 x 1x 1.2 m depending on the size of transformer with nominal reinforcement.It would be a cost effective solution when the transformer is to be placed on ordinary height enabling placing the foundtion on or near ground.<o></o>

Load indicated is also too small & can be easily managed.<o></o>

Transformer foundation shall not be subject to moments @ ordinary level.<o></o>

Regards<o></o>

<o> </o>
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suraj
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Joined: 17 Apr 2008
Posts: 1981
Location: NCR Faridabad, E mail suraj_engineer@yahoo.co.uk

PostPosted: Thu Apr 22, 2010 9:44 am    Post subject: Transformer Plinth Reply with quote

Transformer Plinth
Please, do not opt for concrete block walls 3 m high.
It is suggeted to include RCC plinth as planned for a better & reliable quality assurance & effective sustainability of structures.
Regards

_________________
Thanks & Warm Regards
IntPE(India)Suraj Singh FIE Civil
Engineering & Arbitration

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Kaustubh Vaishnav
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Joined: 07 Apr 2010
Posts: 109

PostPosted: Thu Apr 22, 2010 9:56 am    Post subject: Re: Transformer Plinth Reply with quote

Ok
Thanks for guidence
But i was thinking of trasformer plinth resting on RCC slab which
will rest on block masonary.

my another qestion is that whether is it posible for me to
eluminate beams means slab resting on only columns.
is it posible ?
Plz refer drawing attached

Kaustubh











suraj wrote:
Transformer Plinth
Please, do not opt for concrete block walls 3 m high.
It is suggeted to include RCC plinth as planned for a better & reliable quality assurance & effective sustainability of structures.
Regards
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View user's profile Send private message
suraj
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Joined: 17 Apr 2008
Posts: 1981
Location: NCR Faridabad, E mail suraj_engineer@yahoo.co.uk

PostPosted: Thu Apr 22, 2010 11:49 am    Post subject: Transformer Plinth Reply with quote


Transformer Plinth<xml><o></o>

I would not suggest columnless supports for the plinth due to structural requirement reasons.<o></o>

Yes, beamless plinth would do provided, the following provisions are ensured:<o></o>

Convert slab into beam.<o></o>

Provide double mesh by providing rebar mesh at top as well as at bottom.<o></o>

Increase slab thickness for meeting such requirement.<o></o>

Check for the bending moment, shear force as well as punching shear at column locations.

Check resistances against lateral forces.<o></o>

This provision would save beam forms.<o></o>

Regards<o></o>

<o> </o>

_________________
Thanks & Warm Regards
IntPE(India)Suraj Singh FIE Civil
Engineering & Arbitration

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View user's profile Send private message Visit poster's website
Kaustubh Vaishnav
...
...


Joined: 07 Apr 2010
Posts: 109

PostPosted: Thu Apr 22, 2010 11:57 am    Post subject: Re: Transformer Plinth Reply with quote

Dear sir
Thanks a lot
for your valuable guidence.

I really apriciate ur practicle as wel as structural knowlege.

Thanks & regards

Kaustubh

suraj wrote:


Transformer Plinth<xml><o></o>

I would not suggest columnless supports for the plinth due to structural requirement reasons.<o></o>

Yes, beamless plinth would do provided, the following provisions are ensured:<o></o>

Convert slab into beam.<o></o>

Provide double mesh by providing rebar mesh at top as well as at bottom.<o></o>

Increase slab thickness for meeting such requirement.<o></o>

Check for the bending moment, shear force as well as punching shear at column locations.

Check resistances against lateral forces.<o></o>

This provision would save beam forms.<o></o>

Regards<o></o>

<o> </o>
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