Let us estimate the brick masonry septic tank as shown below.
1. Excavation:
Volume of excavation
= [length × breadth × depth]
Here, the length & breadth of excavation is the same as that of PCC.
= [ 11ft. × 7.5ft. × 6.75ft.]
= 556.88 cu ft.
2. PCC:
Given data:
The extra length of PCC on all 4 sides of the septic tank is 6" (0.5ft.)
Length = 11ft.
Breadth = 7.5ft.
Thickness= 5" = 0.416 ft.
(As 1ft. = 12 inches)
Volume of PCC
= [length × breadth × thickness]
= [ 11ft. × 7.5ft. × 0.416ft.]
= 34.32 cu ft.
3. Brick masonry:
a. 9" thick outer wall:
Given data:
Length = 10ft.
Width = 9" = 0.75 ft.
(As 1ft. = 12 inches)
Height = 6ft.
Let us find the vol. of brick masonry by the longwall short wall method.
The volume of the longwall
= [2nos.×( length × width × height)]
= [2nos. × ( 10 ft. × 0.75 ft. × 6 ft.)]
= [ 2nos. × 45 cu ft.]
= 90 cu ft.
The volume of the short wall
= 2nos. × [{ length} × width × height]
= 2nos. × [{6.5 ft.- (2nos.× 0.75 ft.)} × 0.75 ft. × 6 ft.]
= 2nos. × [{5 ft.} × 0.75 ft. × 6 ft.]
= 2nos. × [ 22.5 cu ft.]
= 45 cu ft.
The total volume of 9" thick. brick wall
= the volume of { longwall + short wall}
= {90 cu ft. + 45 cu ft.}
= 135 cu ft.
b. 4" thick inner partition walls:
Baffle wall-1
The volume of the baffle wall-1
= [ {length} × width × (height)]
= [{ 6.5 ft.- (2nos.× 0.75 ft.)} × 0.33 ft. × (6 ft. - 1.5 ft.)]
= [{5 ft.} × 0.33 ft. × (4.5 ft.)]
= 7.425 cu ft.
The volume of wall 2
= [ {length} × width × height]
= [{6.5 ft.- (2nos.× 0.75 ft.)} × 0.33 ft. × 6 ft.]
= = [{5 ft.} × 0.33 ft. × 6 ft.]
= 9.90 cu ft.
The total volume of 4" thick. brick wall
= the volume of { wall-1+ wall-2}
= {7.425 cu ft. + 9.9 cu ft.}
= 17.33 cu ft.
4. Plastering:
a. For 9" brick wall:
Area of plastering
= 2nos. × [ (area of a longwall) + (area of a short wall)]
= 2nos. × [ (10ft. × 6ft.) + (5ft. × 6ft.)]
= 2nos. × [ 60 sq ft. + 30 sq ft.]
= 180 sq ft.
Note: Length & height of the longwall & short walls are taken for area calculation.
b. For 4" inner wall
Area of plastering
= 2 sides. × [ (area of wall-1) + (area of wall-2)]
= 2 sides × [ ( 5ft. × 4.5ft.) + ( 5ft. × 6ft.)]
= 2 sides × [ 22.5 sq ft. + 30 sq ft.]
= 105 sq ft.
c. For floor base
Floor area plastering
= [ {length} × { breadth.}]
= [{10 ft. - (2nos. × 0.75ft.)} × {6.5ft. - (2nos. × 0.75ft.)}]
= [ {10ft. - 1.5 ft.} × { 6.5ft. - 1.5ft.}]
= [8.5ft. × 5ft.]
= 42.5 sq ft.
Total plastering area
= plastering area of [ 9" wall + 4" wall + floor]
= [180 sq ft. + 105sq ft. + 42.5 sq ft.]
= 327.5 sq ft.
5. RCC slab:
The area of the RCC slab
= [length × breadth ]
= [ 10ft. × 6.5 ft.]
= 65.0 sq ft.
6. Miscellaneous:
Inlet & outlet pipe of 4" dia = 2 nos.
Manhole cover with frame = 1no.
Vent pipe = 1no.
Continued 👇 Part-2
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