Let us estimate the below-given building drawing by the centerline method.
Calculation:
Procedure:
First, we have to calculate, the center-to-center distance of all the walls of the building above the plinth level.
c/c length of the long wall
= [ room-1 breadth + partition wall thickness + room-2 breadth + (2nos. × 1/2 × wall thickness)]
= [3.5m. + 0.3m. + 4.5m. + (2nos. × 1/2 × 0.3m.)]
= 8.6m. ( as shown in the above drawing).
c/c length of the short wall
= [ room length + (2nos. × 1/2 × wall thickness)]
= [5m. + (2nos. × 1/2 × 0.3m.)]
= 5.3m.
Length of the partition wall
= room length = 5m.
Points to remember 👇
We have not added the width of the wall to the partition wall length. This is because we have already taken that part of the wall in the c/c length of the long wall. As you can observe in the above drawing, the black shaded portion will get repeated, if we add them to the partition wall.
You have to remember this point while doing the estimation by the centerline method.
Now, the total centerline length of the wall
= [(2nos. × c/c length of longwall) + (2nos. × c/c length of the short wall) + length of partition wall]
= [(2nos. × 8.6m.) + (2nos. × 5.3m.) + 5m.]
= [17.2m. + 10.6m. +5m.]
= 32.80 m.
1. Excavation:
The volume of excavation for the foundation
= [ centerline length × breadth × depth]
= [32.80m. × 1.2m. × (0.15m. + 0.55m.)]
= 27.552 cum.
2. PCC :
The volume of PCC for the foundation
= [ centerline length × breadth × thickness]
= [32.80m. × 1.2m. × 0.15m.]
= 5.904 cum.
3. Foundation:
The volume of the building foundation
= [ centerline length × breadth × depth]
= [32.80m. × 0.9m. × 0.55m.]
= 16.236 cum.
4. Plinth:
The volume of the plinth wall
= [ centerline length × breadth × depth]
= [32.80m. × 0.6m. × 0.45m.]
= 8.856 cum.
5. Superstructure:
The volume of the wall above the plinth level
= [ centerline length × breadth × height]
= [32.80m. × 0.3m. × 3m.]
= 29.52 cum.
Note: The estimation is done in an elaborate way so that you will understand the concept clearly. Actually, the estimation is done in a table format as shown below.
|
Sl. No. |
Description |
Nos. |
Length in m. |
Breadth in m. |
Depth in m. |
Qty. in cum |
|
1. |
Excavation for foundation. |
1 |
32.80 |
1.2 |
0.70 |
27.552 |
|
2. |
PCC for foundation. |
1 |
32.80 |
1.2 |
0.15 |
5.904 |
|
3. |
Foundation |
1 |
32.80 |
0.9 |
0.55 |
16.236 |
|
4. |
Plinth wall |
1 |
32.80 |
0.6 |
0.45 |
8.856 |
|
5. |
Superstructure wall. |
1 |
32.80 |
0.3 |
3.00 |
29.52 |
To go through the articles on Estimation & calculation in civil engineering, click here.
Thank you for going through these calculation steps❤. Have a good day 😄.
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