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Need help about slab and iron to be used in pillars and slab

Wed May 29, 2013Total posts : 3
vamsi
vamsi
Join date: Dec 2011
Topic: Need help about slab and iron to be used in pillars and slab

Hello,

I need some information on the iron rod sizes to be used for my house construction.

plot size: 50ft * 60ft
Construction site size:43'7" *23'10"
Construction floors: 1 ( As of now). Might go for another floor in future.
basement height: 3ft
Pillars height:9ft
columns:1ft
Slab :4inch

1. The builder has laid down the pilar footings with about 6-8ft depth pits and laid the colums with 12mm rods. This guy has put 6 rods in all the columns except the 4 ones which come at the 4 corners ( marked them in blue hexagons). When I visited the site I realized that the same was done for every flat in the venture. So I paid extra amount to this guy and asked him to put 2 more 12mm steel rods in all the 4 corner pillars.
He said he has drilled and put the new rods. I am not sure of this whether he drilled in to footing and placed them or just placed them normally above the footing. does this addition adds any strength or not?

2. 3 of the pillars are supposed to be placed 12ft apart (Marked in brown squares), but they kept them 16ft apart by mistake ( Marked in green squares). So the room dimensions will be now 16ft*12ft ( Bedroom 1) 16ft*10ft 9 (bedroom 2).
The bedroom 1 needs to bear the over head water tank of about 2000L. As this guy did the mistake  he mentioned that he will use 16mm rods in slab only in the bedroom area ( Not colums) to bear the weight. Rest of the slab area will be built using 12mm.

So now does this make any sense? Does 16mm rods bear the so called 16ft weight?  Does this hinder any strenght of the building?

Also any other suggestions in the plan for vastu/betterment are welcome

thanks,
vamsi.
Attachments: PLan for steel.jpg on Wed May 29, 2013,&n
Wed May 29, 2013Post  #1
Rudra Nevatia
Rudra Nevatia

Join date: May 2013
vamsi:

As compared to an internal column, a corner column carries less load and therefore less steel is required in corner columns.

It is very likely that the additional bars are near the center lines of columns and therefore there will be no pull-out action on these bars. In such a situation, a nominal connection to footing will suffice.

As for the load from water tank, its shape, size and location will determine the slab steel. In general, it is preferable to place tank near beams / walls.

I am not a vastu expert but I did a check and found that one of the columns falls right at Brahm Sthan which is to be avoided. 

Regards,
Rudra Nevatia
Attachments: vamsi.png Wed May 29, 2013,&n
 
Wed May 29, 2013Post  #2
vamsi
vamsi

Join date: Dec 2011
Rudra Nevatia Sir,

First of all thank you very much for the answer and spending your valuable time for me.As of now the pillars are already constructed and hence I can not change the bramhastana pillar. Even if the builder have constructed the pillar according to original plan, it would be in the same area.
Are there any alternatives for this?

Also can some one answer my 2nd question about 16mm bars and weight.
 
Wed May 29, 2013Post  #3
Abhishek Garg (Builder & Engineer)
Abhishek Garg (Builder & Engineer)

Join date: Apr 2013
Dear Vamsi: It is ideal that you show your plans to a structural engineer to get an accurate account. 

Adding to Mr. Rudra's statements, do place the water tank over a 9" wall/column.

Do tell your contractor/builder to leave additional lengths of steel projecting out of the roof as you have suggested that you may go for an additional storey construction in the future.
 

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