I am Engr Chukwudubem Ebenezerwilliams Ikennaya ( formally known as Chukwudubem Darlington ) but many call me Engr Dubem or Dubem, am one of the engineers that works with BEAREN BROTHERS CONSTRUCTION COMPANY LIMITED as a Structural engineer and a supervisor in the Civil Engineering Department. BEREAN BROTHERS also have subsidiaries, CAPITAL SHELTERS AND CONSTRUCTION COMPANY LTD inclusive. I have my personal team under the companies, and we are assigned to sites with complicated or delicate structural needs.

We are currently in Nkanu where we are assigned to build a 7bedroom mansion with a swimming pool in the basement.


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The labour cost of this project will be recorded accordingly in details as well as the work process from scratch.

Here, we started with Setting out first after the marking out, we dismantled the setting out for excavator to have access but will reset after excavation for the structural members.


Below are the sketch of the excavation

Excavation...

But we need to gather the sand at a spot

The basement excavation first then the swimming pool.

Supply of aggregate
Sharp sand and
Superset cement continues

With Excavator 320 D its a soft job of few hours to excavate both the basement and swimming pool.

It's a fast earth moving equipment.

Other ancillaries pertaining reinforcement are in process.

1 fabricating column base reinforcement
2 bending 25mm rebar ( TMT )
3 fabricating the 4m column rebar

25mm rebar for the columns of the basement (4meters height)

Dressing of the soil wall, strap and column base excavation ongoing...



The basement excavated depth is about 7ft = 2.1m

The swimming pool excavated depth is between 3ft - 6ft = 0.900m - 1.8m

Column base excavation is
2ft deep x 3ft square = 0.600m x 0.900m x 0.900m

Strap excavation is
1ft deep x 3ft width = 0.300m x 0.900m

Blinding off the soil

More materials coming in...

*Erecting the 25mm columns rebar

* Column base reinforcement for the 25mm TMT rebar is made 24mm capacity

* 16mm (TMT) rebar 8 bars including as some of the basement column rebar.

*Lowering the 25mm rebar in the basement pit was a difficult task

More on column rebar erection and casting

* Casting continues


* Iron worker to reinforce the basement wall.


* Carpentry: framing more boards

Boarding...

Casting continues on night shift

Casting and reinforcement continues

Some biscuits are ready for use

Because of cost we will board, loose and reuse the marine board

We are going to cast the basement wall all through...

The carpenters at it

The casting continues

We have two mix ratio to suit the process and conditions.

The mix ratio designed for

1:4:4 concrete mix
And
1:4:4.5 concrete mix

With fix it water resistant

Reusing the board

Cost of labour from excavation to DPC/ Deck is coming up soon.


Overview of work done so far

Saving cost ... the marine board is #14,000 as at today, so we need to board twice or more to save cost of purchasing more board.

Outside the original design, the client wants an addition of space on the basement step and space to crate an alternative exit from the basement no matter small.

Oh well, just added a little cost and it was done.

Dubemcapital1:
Outside the original design, the client wants an addition of space on the basement step and space to crate an alternative exit from the basement no matter small.

Oh well, just added a little cost and it was done.

Very good decision by the client.

Safety first!

Badgers14:


Very good decision by the client.

Safety first!

Honestly, the archtect that did the design ignored a lot of things, but that's why we are here to interpret, advice, weigh options and considerably construct a safe and comfortable abode for clients that values such.

This is a very huge projects, congratulations.
This is by far a standard way of modern construction especially in high rise building designs.
Most of these sky scrapers and other tall building construction use this Same construction process.
For the depth of the foundation on this very building why such depth? Because for sky scrappers I know the high depth is to give the building a solid rigidity against wind load, height and other factors.

brandsoncharlie:
This is a very huge projects, congratulations.
This is by far a standard way of modern construction especially in high rise building designs.
Most of these sky scrapers and other tall building construction use this Same construction process.
For the depth of the foundation on this very building why such depth? Because for sky scrappers I know the high depth is to give the building a solid rigidity against wind load, height and other factors.

Thank you sir, actually its not a deep foundation. Its neither pile nor Caisson. It is the basement of the house (underground) which we understand have added to the reinforcement or strengthening of the substructure (foundation)

Having gotten to almost the conclusion of the basement, its time to excavate other part of the foundation.


Must be a tough one for the workers because they have to excavate manually from the top of the hipped soil to the ground, its not going to be funny though.

From the other side of the basement excavation, blinding and column base excavation in progress.

Althrough concrete construction the process has been fortified with water resistant effect. Dr fixit and Top shield