Project : 7bedroom duplex foundation
Land condition : slopy, swampy &narrow.
Location : Oshimiri Private Estate, Enugu.
Proposal: highcapacity private home
Contractor: Capital shelters Ltd
Engineer in charge : Engr Dubem



Welcome as we discuss this project together..

Condition of the land : We have 450m² here though its a very wet land and Valley also( 7feet) below the level of the road.

We shall consider a combined foundation
To achieve safety and economy

Nice, I'm interested in this project updates, kindly keep it flowing in

Rod are of many brand , going for the best will always give you the best result.

Like I said; its going to be combined foundation, we choose this after soil study and other consideration. However it's safer, more reliable and economical.

More pictures on wood work preparation

Rebar , columns and column bases.

But before the erecting the column we have to apply a chemical in the column base that is filled with water.

The land is quite interesting so we made column bases and it columns more interesting well study has proven the area to be seriously swampy so we need to get the foundation neatly reinforced

The rebar: rebar is used to increase the tensile strength of concrete. That exactly what gat to do.

More pictures

More work on the fitters corner right now.

Preparation completed in some partition so casting is next


With the situation of this land (waterlogged and sandy) we shall introduce a chemical for the cast work to robber seal the concrete for posterity

Boarding and wood fixture on the other part...

Moving on

Casting the walls commences, what we will do is :

1. Cast, loose and reuse the board for cost control.

2. Raise block walls within some strip to resist lateral pressure instead of concrete walls and that also is a cost control measure.

More

Rounding off the wall casting..

Loosing the board and walling to level

Good for filling


The depth of the foundation to be filled is between 8' - 9'6" ( feet). However is going to take some good number of laterite.

Still filling up the foundation

Sinking the filling with water and compacting

While compacting is on we need to start reinforcement at once.

Laying the hardcore

When rain began properly we are already done with the earthwork


Let us look at this, you know many people don't know why we use hardcore stone in a building like this many have asked " is it a filling station ? Is heavy duty Truck going to be offloading on this foundation? Are you building skyscraper here ? Why all the hardcore or lump stone ?




Well I will list at least 5 importance of hardcore


1. It gives a good base for the building.

2. Hardcore strengthens or solidifies the base which the oversite concrete will sit on.

3. it helps in resisting pressure of dead and live loads on the ground floor.

4. It also helps to save cost of construction, the volume occupied by the hardcore if it were to be concrete it would have cost more.

5.The gap between the Oversite concrete and the filling created by hardcore helps to reduce movement of water up to the ground floor

Reinforcing the OSC



Mesh or re-bar has been used as a reinforcement for concrete slabs that are designed to carry load, whether that loading would be carrying traffic or bearing another structure such as a wall.

Meshes are important in slab concrete cast because is strong in compression. Steel mesh will prevent tension that may cause cracks to large degree and hold it all together.

Over site concrete...

OSC completed


We don't need DPM since the foundation is above 9ft height

That's how we made the foundation.


Thanks to God for a successful completion.

I Shall list the materials we used to achieve this and the financial value of this work


Thanks for following this trend.

Well done bro. My site has sharp sand and the water underneath the sand is close to the surface during raining season. In fact, Wells in the area are not deeper that 8ft. How can I go about the foundation on that type of soil?

chemicool:
Well done bro. My site has sharp sand and the water underneath the sand is close to the surface during raining season. In fact, Wells in the area are not deeper that 8ft. How can I go about the foundation on that type of soil?

Conduct a soil test, take it to a qualified architect to design the proposed building. With the soil test result the architect will recommend a suitable foundation for your building, a structural engineer can do same.


However sharp sand is not a threat to foundations, is one of the best soil to build on if you are experienced. On sharp sand you can use Pile, float foundation, combined foundation etc but which ever one it must be a very high foundation.

I may help more if I examine the soil myself on how to achieve a normal foundation that will be safe and cost friendly.

Thanks boss. I will get back to you.