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Construction of a Duplex With Raft Foundation. - Properties - Nairaland

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Construction of a Duplex With Raft Foundation. by RobbStark(m): 10:39am On Mar 02, 2017
Pls Nlanders in this section, join me as I show you the development of a duplex with raft in Ph.

Pictures all the way to finishing.
Questions are welcomed and will be answered asap.
This pix shows the formation of the raft beams jus before the rebars for the columns were inserted

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Re: Construction of a Duplex With Raft Foundation. by penitential(m): 10:43am On Mar 02, 2017
What warrant the specification of raft foundation for this type of soil; seeing clearly that the soil is a soil with moderate soil bearing capacity?

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Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 10:43am On Mar 02, 2017
Rebars for columns inserted and formwork done awaiting concrete work.

Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 10:45am On Mar 02, 2017
penitential:
What warrant the specification of raft foundation for this type of soil; seeing clearly that the soil is a soil with moderate soil bearing capacity?

A test was conducted and it was found.that there is an underlying layer of clay material which you know is plastic in nature

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Re: Construction of a Duplex With Raft Foundation. by penitential(m): 10:47am On Mar 02, 2017
Ok.
RobbStark:


A test was conducted and it was found.that there is an underlying layer of clay material which you know is plastic in nature
Re: Construction of a Duplex With Raft Foundation. by biazarre(m): 10:52am On Mar 02, 2017
ground beam
Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 10:54am On Mar 02, 2017
Concrete work on-going

Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 10:57am On Mar 02, 2017
penitential:
Ok.

Ya.
To avoid an uneven settlement which may result in collapse, hence this kind of foundation.
Re: Construction of a Duplex With Raft Foundation. by penitential(m): 11:09am On Mar 02, 2017
I know. Just been curious alil cos what I was seeing was in no way suggesting a bad soil, but you kudzu cleared it that it has an underlying clay deposit.
RobbStark:


Ya.
To avoid an uneven settlement which may result in collapse, hence this kind of foundation.
Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 11:46am On Mar 02, 2017
Casting of beams cimpleted and block work done to approved level. Note, this level is to avoid flooding of the area as it is close to a river.

Re: Construction of a Duplex With Raft Foundation. by penitential(m): 11:51am On Mar 02, 2017
@op, don't you think it will be more advisable to increase the height of the raft beam, cos its likely water might weaken the blocks
RobbStark:
Casting of beams cimpleted and block work done to approved level.
Note, this level is to avoid flooding of the area as it is close to a river.
Re: Construction of a Duplex With Raft Foundation. by Nobody: 12:29pm On Mar 02, 2017
Does a raft foundation allow for German Flooring? When is the German Flooring done? Because it seems you commenced block work immediately after.

Just curious.

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Re: Construction of a Duplex With Raft Foundation. by Nobody: 12:36pm On Mar 02, 2017
This is not raft foundation...i think u can call this reinforced concrete deep strip depending on the depth of the ground beam..

We have three type of raft foundation & this doesn't fall into any...

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Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 1:35pm On Mar 02, 2017
penitential:
@op, don't you think it will be more advisable to increase the height of the raft beam, cos its likely water might weaken the blocks

The height of the raft is 1200mm alone. Then we have 3couch of block work.
From wat we have at site, I wanted 2couch but the architect with the owner chose it this way.
This level now is far above the road in front of the house, and slightly that at the back.
So frm level of water checked year in and out, water cannot get to the blocks

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Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 1:59pm On Mar 02, 2017
So people, the work is progressing.
After the block work, comes the boarding and casting of the short columns to DPC level.
Filling is ongoing rite now. I will upload pix wen I get to the site soon.


Questions will be entertained asap.
Re: Construction of a Duplex With Raft Foundation. by penitential(m): 2:01pm On Mar 02, 2017
Ok, good.
RobbStark:


The height of the raft is 1200mm alone. Then we have 3couch of block work.
From wat we have at site, I wanted 2couch but the architect with the owner chose it this way.
This level now is far above the road in front of the house, and slightly that at the back.
So frm level of water checked year in and out, water cannot get to the blocks
Re: Construction of a Duplex With Raft Foundation. by Aventures(m): 2:50pm On Mar 02, 2017
STRATEK:
This is not raft foundation...i think u can call this reinforced concrete deep strip depending on the depth of the ground beam..

We have three type of raft foundation & this doesn't fall into any...
I concur with you but I really want to see the end before sharing my view. unless there is a capping beam and ground floor reinforcements and the block wall filled solid with concrete then this is far from raft foundation and it cannot function as raft. This is the type of foundation somebody did for Mr QC1 if my memory serves me right, in this case the possibility of uneven settlement could be higher.
If this is not closed as raft, a reinforced strip footing and pad foundation would have been ideal.

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Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 7:10pm On Mar 09, 2017
OmaniPadmeHum:

Does a raft foundation allow for German Flooring? When is the German Flooring done? Because it seems you commenced block work immediately after.

Just curious.

The block work is part of the foundation. This was done to raise the level of the DPC.
wat ever happen in constructing the road leading to compound will never affect the house.

This is a pix showing DPC casting

Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 7:19pm On Mar 09, 2017
STRATEK:
This is not raft foundation...i think u can call this reinforced concrete deep strip depending on the depth of the ground beam..

We have three type of raft foundation & this doesn't fall into any...

For education purposes, can you pls do me the honour by naming them.

I know of slab and beam raft and that is wat we are doing.

I will be waiting to share in the info.
Regards.
Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 7:23pm On Mar 09, 2017
Tomorrow being Friday, we will do the forming(block setting out), and hopefully take it to the window level.

The rain has come upon us here in the city.
Re: Construction of a Duplex With Raft Foundation. by Nobody: 7:25pm On Mar 09, 2017
RobbStark:


The block work is part of the foundation. This was done to raise the level of the DPC.
wat ever happen in constructing the road leading to compound will never affect the house.

This is a pix showing DPC casting

Just curious from my knowledge of Structural Safety.

I was thinking the DPC should be a continuous structure. This seems as if you made them in parts/sections.

Secondly, if the Block Work is part of the foundation (to gain some height) how well will the hollow blocks bear the load transferred from the DPC? I would have thought the DPC would be directly on the Raft Casting? That way, load from the block work and lintels (on the ground floor) will go the the DPC and transferred to the Raft Foundation. I cant help but feel that the block work might give way.

Anyway, neat Iron works for the foundation. Very neat and straight.
Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 7:30pm On Mar 09, 2017
OmaniPadmeHum:


Just curious from my knowledge of Structural Safety.

I was thinking the DPC should be a continuous structure. This seems as if you made them in parts/sections.

Secondly, if the Block Work is part of the foundation (to gain some height) how well will the hollow blocks bear the load transferred from the DPC? I would have thought the DPC would be directly on the Raft Casting? That way, load from the block work and lintels (on the ground floor) will go the the DPC and transferred to the Raft Foundation. I cant help but feel that the block work might give way.

Anyway, neat Iron works for the foundation. Very neat and straight.

Thanks for the observation.
Jus so you know, the slab has internal beam running along the beamlime or block line which will transfer wat ever load that will be coming to the slab to the columns and down to the foundation.

Thanks for the compliment.@ neat work
Re: Construction of a Duplex With Raft Foundation. by RobbStark(m): 11:38am On Mar 25, 2017
Good day everyone.
It’s been awhile since I last post. Very busy running around job sites lately.
Well, I jus want to show you the level of this work so far.
I didnt want to bore you guys with block work cos that is a normal routine at various site.
The pix below shows the stage of work we are rite now.
Blocks have been leveled and the formwork for the first floor slab done awaiting the reinforcements.

Re: Construction of a Duplex With Raft Foundation. by FADEO: 9:32pm On Nov 01, 2017
how far with this project

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Re: Construction of a Duplex With Raft Foundation. by mahoneslim07: 12:44pm On Aug 15, 2019
this is good job, well detailed but i must also say this is pure waste of money.
i still don't understand the reason behind excavating the NG(natural Ground) to receive the Raft beams, then starts adding block walls to increase the level.
the ideal practice is to scrap the NG a little atleast to remove top soil, then blind, then erect your form-works, reinforcements and then cast.

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