The document provides an example of calculating quantities of excavation, PCC work, UCR work, and brick work using the center line method. It first calculates the total center line distance of the walls as 25.1 meters. It then calculates the quantities of each item by using the total center line length minus half the breadth and multiplying by the other dimensions. This provides the total quantities of 20.58 cubic meters of excavation, 5.88 cubic meters of PCC work, 10.89 cubic meters of 0.9 meter thick UCR work, 6.21 cubic meters of 0.5 meter thick UCR work, and 20.46 cubic meters of brick work.

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SESSION: 06 CENTRE LINE METHOD

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Example:
Find out quantities of following items of work
i. Excavation ii. PCC iii. UCR work iii. Brick Work
Step 1: To calculate Total center line distance of walls
TL=3.3 x 2+ 4.3 x 2+3.3 x 3 = 25.1 m
OR TL=7.6 x 2+ 3.3 x 3=25.1
3m x 3m 4m x 3m
0.5m
GL
FLOOR PLAN 0.9m
1.2m
7.6
7.3 m
3.3 m 3.3 m
2.75m
0.5m
0.2m
0.3m
0.5m

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Measurement sheet:
Sr.no.
Work description Unit No’s Length Width Height/
Depth
Quantity Total
Quantity
i. Excavation (B-1.2m) M3 1 24.5 1.2 0.7 20.58
TL=C/C L – ½ x B
=25.1- ½ x 1.2
=24.5 m
ii. PCC Work (B-1.2m)
TL=C/C L – ½ x B
=25.1- ½ x 1.2
=24.5 m
M3 1 24.5 1.2 0.2 5.88
ii. UCR work (B-0.9m)
TL=C/C L – ½ x B
=25.1- ½ x 0.9
=24.2 m
M3 1 24.2 0.9 0.5 10.89
ii. UCR work (B-0.5m)
TL=C/C L – ½ x B
=25.1- ½ x 0.5
=24.85 m
M3 1 24.85 0.5 0.5 6.21
iii. Brick Work (B-0.3m)
TL=C/C L – ½ x B
=25.1- ½ x 0.3
=24.8 m
M3 1 24.8 0.3 2.75 20.46