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NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS
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ishata_gupta
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PostPosted: Wed Oct 03, 2018 8:12 am    Post subject: NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS Reply with quote

Hello Everyone!

I am designing a residential 3-storey building located between two existing buildings. Existing common wall is 13.5" Thk. at both sides with its brick foundation located at 2.5' below DPC level.
I am providing one-sided footings with strap beams for the columns located just at the property lines. my major concern is that in order to go 4'-5' below NGL for the foundation of my building, we'd need to chisel the parts of the existing brick foundation.
As a structure engineer, what precautions/steps of construction shall i recommend at site to ensure safety of the existing buildings??

Quick responses will be highly appreciated!!!
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es_jayakumar
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PostPosted: Thu Oct 04, 2018 3:34 pm    Post subject: Reply with quote

Are the adjoining buildings in use ? You have to keep two aspects in mind, in this regard :
1. Chiseling the foundations of the existing buildings will not only reduce the bearing area, but also make the loading on soil eccentric. Impact while chiseling can damage the adjoining portion of masonry also.
2. When you place the new foundation abutting an existing one, the soil may get over-stressed due to merging of pressure bulbs.

E S Jayakumar
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sktrisal
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PostPosted: Fri Oct 05, 2018 4:30 am    Post subject: NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS Reply with quote

If you must go below the founding level of adjacent building.do not scrap the adjacent have an eccentric footing and raise a footing beam along the excavated line make sure go at least 150mm above the bottom of adjacent foundation.these two beams on either side should be properly compacted on the side.Sktrisal


On Fri, 5 Oct 2018, 08:39 es_jayakumar, <forum@sefindia.org (forum@sefindia.org)> wrote:

Quote:
           Are the adjoining buildings in use ? You have to keep two aspects in mind, in this regard :
1. Chiseling the foundations of the existing buildings will not only reduce the bearing area, but also make the loading on soil eccentric. Impact while chiseling can damage the adjoining portion of masonry also.
2. When you place the new foundation abutting an existing one, the soil may get over-stressed due to merging of pressure bulbs.

E S Jayakumar
     



     


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suraj
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PostPosted: Fri Oct 05, 2018 5:11 am    Post subject: Border restraint Reply with quote

Better design a combined footing
Why go 4.5 feet below NGL?
What is value of SBC?
It is OK just to found building at a depth around 1M, if SBC permits
If it is required, apply soil improvement method to raise soil BC
This common wall problem is too old & not required, but authorities do not think
You can also, opt for beam foundation connecting all columns if Combined Footing is not desired
Design as structural beams shall provided a better foundation
Columns to come up from top of beams, with reinforcing starter bars from base of beam
Spread isolated footing not necessary
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ravee6a
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PostPosted: Fri Oct 05, 2018 8:30 am    Post subject: NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS Reply with quote

Dear gupta,

Take the advise of local engineer having experience of such foundation
and soil condition of that locality.
A.Raveendran.

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SATYAPAUL
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PostPosted: Fri Oct 05, 2018 11:30 am    Post subject: NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS Reply with quote

please only cut the offset,i.e. of brickwork of extended footing in your boundary limit,up to the width  of rcc column of strap foundation you have proposed.rcc foundation joining columns at footing level  must be just away from the brick work.never expose full length of brick foundation of adjacent  building. regards satya pal you can mail the exact sketch with brick foundation depth with encroachment on the other's property.  On Fri, 05 Oct 2018 13:45:08 +0530 "sktrisal"  wrote >                   If you must go below the founding level of adjacent building.do not scrap the adjacent have an  eccentric footing and raise a footing beam along the excavated line make sure go at least 150mm above  the bottom of adjacent foundation.these two beams on either side should be properly compacted on the  side.Sktrisal >  >  > On Fri, 5 Oct 2018, 08:39 es_jayakumar, wrote: >  >       --auto removed--

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hemaraj rv
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PostPosted: Fri Oct 05, 2018 6:30 pm    Post subject: NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS Reply with quote

check the soil property and if possible construct same brick foundation partially for adjacenrt columns

On Wed, Oct 3, 2018 at 3:53 PM ishata_gupta <forum@sefindia.org (forum@sefindia.org)> wrote:

Quote:
           Hello Everyone!

I am designing a residential 3-storey building located between two existing buildings. Existing common wall is 13.5" Thk. at both sides with its brick foundation located at 2.5' below DPC level.
I am providing one-sided footings with strap beams for the columns located just at the property lines. my major concern is that in order to go 4'-5' below NGL for the foundation of my building, we'd need to chisel the parts of the existing brick foundation.
As a structure engineer, what precautions/steps of construction shall i recommend at site to ensure safety of the existing buildings??

Quick responses will be highly appreciated!!!
     



     


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SATYAPAUL
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PostPosted: Sat Oct 06, 2018 2:30 am    Post subject: NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS Reply with quote

i have already emailed my comments.  On Sat, 06 Oct 2018 06:29:32 +0530 "hemaraj rv"  wrote >                   check the soil property and if possible construct same brick foundation partially  for adjacenrt columns >  > On Wed, Oct 3, 2018 at 3:53 PM ishata_gupta wrote: >  >       --auto removed--

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sk_tata
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PostPosted: Sat Oct 06, 2018 3:30 am    Post subject: NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS Reply with quote

Absolutely Correct Trisal Sir,
Safety point of view and proper bearing it's important.

Santosh Kr Sharma
Ashiana Housing Ltd


From: "sktrisal" <forum@sefindia.org>
To: "general" <general@sefindia.org>
Sent: Friday, October 5, 2018 1:44:55 PM
Subject: [SEFI] Re: NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS



           If you must go below the founding level of adjacent building.do not scrap the adjacent have an eccentric footing and raise a footing beam along the excavated line make sure go at least 150mm above the bottom of adjacent foundation.these two beams on either side should be properly compacted on the side.Sktrisal  On Fri, 5 Oct 2018, 08:39 es_jayakumar, forum@sefindia.org)> wrote:         --auto removed--

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prof.dsp
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PostPosted: Sat Oct 06, 2018 6:30 am    Post subject: NEW BUILDING BETWEEN TWO ADJACENT EXISTING BUILDINGS Reply with quote

It's better to avoid chiseling by shifting the columns inwards.

On 6 Oct 2018 06:29, hemaraj rv <forum@sefindia.org> wrote:[quote]       check the soil property and if possible construct same brick foundation partially for adjacenrt columns  On Wed, Oct 3, 2018 at 3:53 PM ishata_gupta forum@sefindia.org)> wrote:  --auto removed--

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