deluxecad:
Fabulous job Mr. Spyder

Luchitec:
Hi Spyder, do you have the contact information of the architect who designed this building?

spyder880:
More work planned for today. .......

A fan that just started developing interest in construction and infrastructural development in general, so expect some naive questions.

Looking at these images, ain't the mats for the column starter bars supposed to sit on blinded surfaces. Read somewhere that it's not appropriate for irons to have a direct interface with the soil.

Please clarify.

joseph1013:

A fan that just started developing interest in construction and infrastructural development in general, so expect some naive questions.

Looking at these images, ain't the mats for the column starter bars supposed to sit on blinded surfaces. Read somewhere that it's not appropriate for irons to have a direct interface with the soil.

Please clarify.

spyder880:


Meant to test the space of the column base, we have not even started turning the concrete then. There was a 100mm blinding before the mats were placed, and a further 225mm concrete fill for the columns bafore a 300mm level blinding before starting to set blocks.

Keep the questions coming, welcome.

spyder880:
Getting ready for the setting out.

spyder880:
The column bases are being excavated....

spyder880:
Bringing in cement, the Elephant 'Supaset'

joseph1013:

Why do they make the column bases deeper than the trenches? What's the structural argument?

joseph1013:


Can you kindly explain a bit about the art of setting out for construction as it's tailored towards Nigeria?

Do you measure exactly what is on the drawing or there are some tips one should not miss as it's so easy to make these mistakes on ground on site?

joseph1013:

Thanks. Really appreciated.

Let me rephrase your explanation in my own words. Please correct me if I'm wrong.

After excavation, there was a 100mm blinding, then the mats were placed. Then a 225mm concrete fill was done before the starter column bar was placed. Then another 300mm was poured to hold the column in position.

spyder880:


In these three pictures, I will explain more

The first picture is the excavation, then the column base sunk to planned specification.

The second picture is the first concrete blinding, usually 75mm-150mm depending on what your building plan specifies, the column mat is then placed, and the column starter bar is set, and tied to position.

The third picture is the second blinding after we have set the column starter bar. You can still see some part of the mat. But there will still be another final concrete cast, raising the thickness to the specified gauge on the structural drawings.

joseph1013:

Excellent explanation.

Please explain what is meant when the specification says that cover to main reinforcement to be 20mm in Slab, 25mm in Beam, 30mm in Column and 50mm in Foundations.

Why the disparity in the elements?

spyder880:
We have started doing the reinforcements for the columns...........

joseph1013:
I have a question: How do you make provision for a staircase during the construction of the sub structure? Or perhaps a better question is to ask at what stage is provision made for a staircase and its various elements in a building construction?

spyder880:


You can make provision for the staircase at the sand filling/compaction stage, by marking out a 1200 x 600 space at the very point of the step base and leaving it without a concrete cast when the over site concrete is being cast.

joseph1013:

I was going through some threads and saw where reinforcement was left at the space where the staircase will be. I was curious why.

johnson232:

Stairs are reinforced like slab. remember they are suspended.
but don't be offended, your questions always crack me up...
Are u a student of building, architecture or civil engineering?
I really admire your quest for knowledge....

Thanks. I'm not offended. I'm aware I'm asking loads of silly questions.

So, you leave the space for the staircase with reinforcements coming out. Then at what stage do not return to it to do the staircase itself?

I'm none. Building construction just fascinates me and have always wanted to know more about the technicalities of what makes strong and durable structures.

johnson232:

Stairs are reinforced like slab. remember they are suspended.
but don't be offended, your questions always crack me up...
Are u a student of building, architecture or civil engineering?
I really admire your quest for knowledge....

joseph1013:

Thanks. I'm not offended. I'm aware I'm asking loads of silly questions.

So, you leave the space for the staircase with reinforcements coming out. Then at what stage do not return to it to do the staircase itself?

I'm none. Building construction just fascinates me and have always wanted to know more about the technicalities of what makes strong and durable structures.

joseph1013:

I was reading about anchorage in reinforcement, but didn't really get the nuances well. Can you explain it in layman's terms for me?

johnson232:

Anchorage in reinforcement is when u attach two rods together or to something else to ensure it doesn't loose...hooking...

johnson232:

Anchorage in reinforcement is when u attach two rods together or to something else to ensure it doesn't loose...hooking...

joseph1013:

Usually reinforcements have a length and often one needs more than one reinforcement for a span, so we need to join the bars. How do you know the length to lap the rods?

Example, a length of rod is about 12m(?). If you need to arrange it in a 20m beam, what is the lapping length to use in the new rod?