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Daily Digest Sat Dec 11 23:00:03 2004

 
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ibarua
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Joined: 26 Jan 2003
Posts: 1039

PostPosted: Sun Dec 12, 2004 2:07 am    Post subject: Daily Digest Sat Dec 11 23:00:03 2004 Reply with quote

12 Deceemeber, 2004

Re.: Tank foundation
---------------

In 1960, I was an engineer with a refinery project here. We had a large tank farm with tanks up to 5,000 cu.metres capacity. Here, the original design called for massive RCC rafts to serve as the foundation system for the tanks. We did away with this concept. Instead, we removed the overburden up to a depth of 5 metres or so, provided a RCC ring beam round the periphery, and filled up the cavity with cohesionless soil. The ring beam effectively confined the sand within. Thereafter, we, consolidated the soil in layers using a pre-determined (optimum) moisture content, with the help of sheep's foot rollers. A bituminous carpet was laid over the top of the fill to prevent ingress of moisture into it. The tanks were erected on thop of this prepared subgrade. No noticeable settlements have been reported over the last 40 years.

The same technique was used by me for the design of the foundation for a mollases tank for a sugar mill in 1974-75, to replace a RCC raft suggested by a Delhi based consultant.  

In both these cases, there were considerble savings of cost.

Soil reconditioned with granular piles (stone columns) have been used as a foundation system for storage tanks in Kandla in Gujarat.

RCC piles and rafts are expensive and most often are not required.

Indrajit Barua,
Guwahati, Assam.
On Sat, 11 Dec 2004 general@sefindia.org wrote :
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mangeshb
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Joined: 26 Jan 2003
Posts: 9

PostPosted: Mon Dec 13, 2004 10:01 am    Post subject: Daily Digest Sat Dec 11 23:00:03 2004 Reply with quote

Hi all,
i am urgent need of help on "Purlin as a built system and designed as
open system".
Pls any info is welcomed.
Thanking you,

Regards
Mangesh Bawankar
M/s Design Excellence (I) pvt. LTD.




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sdec.in
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Joined: 26 Jan 2003
Posts: 473

PostPosted: Fri Dec 17, 2004 6:43 am    Post subject: Daily Digest Sat Dec 11 23:00:03 2004 Reply with quote

pl elaborate as to what was the foundation system used instead of a raft,
and what was the size of each tank; and what was the comparison between the
depth of raft and steel provided by you and what is normally provided.
regards
sangeeta
----- Original Message -----
Message From  <ibarua@deguild.com>
To: <sdec@bol.net.in>
Sent: Sunday, December 12, 2004 7:41 AM
Subject: Daily Digest Sat Dec 11 23:00:03 2004


[quote]
12 Deceemeber, 2004

Re.: Tank foundation
---------------

In 1960, I was an engineer with a refinery project here. We had a large
tank farm with tanks up to 5,000 cu.metres capacity. Here, the original
design called for massive RCC rafts to serve as the foundation system for
the tanks. We did away with this concept. Instead, we removed the
overburden up to a depth of 5 metres or so, provided a RCC ring beam round
the periphery, and filled up the cavity with cohesionless soil. The ring
beam effectively confined the sand within. Thereafter, we, consolidated
the soil in layers using a pre-determined (optimum) moisture content, with
the help of sheep's foot rollers. A bituminous carpet was laid over the
top of the fill to prevent ingress of moisture into it. The tanks were
erected on thop of this prepared subgrade. No noticeable settlements have
been reported over the last 40 years.

The same technique was used by me for the design of the foundation for a
mollases tank for a sugar mill in 1974-75, to replace a RCC raft suggested
by a Delhi based consultant.

In both these cases, there were considerble savings of cost.

Soil reconditioned with granular piles (stone columns) have been used as a
foundation system for storage tanks in Kandla in Gujarat.

RCC piles and rafts are expensive and most often are not required.

Indrajit Barua,
Guwahati, Assam.
On Sat, 11 Dec 2004 general@sefindia.org wrote :
[quote]---------------------------------------------------------

Posted via Email
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