Let us estimate the below-given building drawing by the longwall short wall method.
Calculation:
Procedure:
First, we have to calculate, the out-to-out length of the longwall & in to in length of the short wall above the plinth level.
Out to out longwall = [room length + (2nos. × wall thickness)]
= [5m. + (2nos. × 0.3m.)]
= 5.60m.
In to in short wall = room width
= 3.5m.
Now,
Length of longwall of a particular item
= [out to out longwall + (2 × one side offset)]
Length of the short wall of a particular item
= [ in to in short wall - (2 × one side offset)]
Where one side offset or half offset
= [(breadth of the item - wall thickness above plinth) ÷ 2]
1. Excavation for foundation:
One side offset = [(breadth of the item - wall thickness above plinth) ÷ 2]
= [(1.20m. - 0.3m.) ÷ 2]
= 0.45m.
Length of longwall of excavation
= [out to out longwall + (2 × one side offset)]
= [ 5.60m. + (2 × 0.45m.)]
= 6.50m.
Length of the short wall of the excavation
=[ in to in short wall - (2 × one side offset)]
= [ 3.5m. - (2 × 0.45m.)]
= 2.6m.
Excavation volume at a longwall
= 2nos. × [longwall length × breadth × depth]
= 2nos. × [ 6.5m. × 1.20m. × 0.7m.]
= 2nos. × [ 5.46 cum.] = 10.92 cum.
Excavation volume at the short wall
= 2nos. × [short wall length × breadth × depth]
= 2nos. × [ 2.6m. × 1.20m. × 0.7m.]
= 2nos. × [ 2.184 cum.] = 4.368 cum.
The total volume of the excavation
= [volume at long wall + volume at short wall]
= [10.92 cum. + 4.368 cum.]
= 15.288 cum.
2. PCC in foundation:
Length of longwall of PCC = length of longwall of excavation = 6.5m.
Length of the short wall of PCC = length of short of excavation = 2.6m.
PCC volume at a longwall
= 2nos. × [longwall length × breadth × thickness]
= 2nos. × [ 6.5m. × 1.20m. × 0.15m.]
= 2nos. × [ 1.17 cum.] = 2.34 cum.
PCC volume at the short wall
= 2nos. × [short wall length × breadth × thickness]
= 2nos. × [ 2.6m. × 1.20m. × 0.15m.]
= 2nos. × [ 0.468 cum.] = 0.936 cum.
The total volume of the foundation PCC
= [volume at long wall + volume at short wall]
= [2.34 cum. + 0.936 cum.]
= 3.276 cum.
3. Foundation:
One side offset = [(breadth of the item - wall thickness above plinth) ÷ 2]
= [(0.9m. - 0.3m.) ÷ 2]
= 0.3m.
Length of longwall of foundation
= [out to out longwall + (2 × one side offset)]
= [ 5.60m. + (2 × 0.3m.)]
= 6.20m.
Length of the short wall of the foundation
=[ in to in short wall - (2 × one side offset)]
= [ 3.5m. - (2 × 0.3m.)]
= 2.9m.
Foundation volume at the longwall
= 2nos. × [longwall length × breadth × depth]
= 2nos. × [ 6.2m. × 0.9m. × 0.55m.]
= 2nos. × [ 3.069 cum.] = 6.138 cum.
Foundation volume at the short wall
= 2nos. × [short wall length × breadth × depth]
= 2nos. × [ 2.9m. × 0.9m. × 0.55m.]
= 2nos. × [ 1.436 cum.] = 2.871 cum.
The total volume of the foundation
= [volume at longwall + volume at short wall]
= [6.138 cum. + 2.871 cum.]
= 9.009 cum.
4. Plinth wall:
One side offset = [(breadth of the item - wall thickness above plinth) ÷ 2]
= [(0.6m. - 0.3m.) ÷ 2]
= 0.15m.
Length of longwall of the plinth
= [out to out longwall + (2 × one side offset)]
= [ 5.60m. + (2 × 0.15m.)]
= 5.9m.
Length of the short wall of the plinth
=[ in to in short wall - (2 × one side offset)]
= [ 3.5m. - (2 × 0.15m.)]
= 3.2m.
Plinth volume at a longwall
= 2nos. × [longwall length × breadth × depth]
= 2nos. × [ 5.9m. × 0.6m. × 0.45m.]
= 2nos. × [ 1.593 cum.] = 3.186 cum.
Plinth volume at the short wall
= 2nos. × [short wall length × breadth × depth]
= 2nos. × [ 3.2m. × 0.6m. × 0.45m.]
= 2nos. × [ 0.864 cum.] = 1.728 cum.
The total volume of the plinth
= [volume at long wall + volume at short wall]
= [3.186 cum. + 1.728 cum.]
= 4.914 cum.
5. Room wall:
As there is no offset for room wall
Longwall length = out to out longwall length = 5.6m.
Short wall-length = in to in short wall-length = 3.5m.
Room volume at the longwall
= 2nos. × [longwall length × breadth × height]
= 2nos. × [ 5.6m. × 0.3m. × 3m.]
= 2nos. × [ 5.04 cum.] = 10.08 cum.
Room volume at the short wall
= 2nos. × [short wall length × breadth × height]
= 2nos. × [ 3.5m. × 0.3m. × 3m.]
= 2nos. × [ 3.15 cum.] = 6.30 cum.
The total volume of the room wall
= [volume at long wall + volume at short wall]
= [10.08 cum. + 6.30 cum.]
= 16.38 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 |
Total Qty. in cum. |
|
1. |
Excavation for foundation.
|
|
|||||
|
1a. |
Long wall |
2 |
6.5 |
1.2 |
0.7 |
5.46 |
10.92 |
|
1b. |
Short wall |
2 |
2.6 |
1.2 |
0.7 |
2.184 |
4.368 |
|
|
Total volume of excavation |
15.288 |
|||||
|
2. |
PCC for foundation. |
|
|||||
|
2a. |
Long wall |
2 |
6.5 |
1.2 |
0.15 |
1.17 |
2.34 |
|
2b. |
Short wall |
2 |
2.6 |
1.2 |
0.15 |
0.468 |
0.936 |
|
|
Total volume of foundation PCC |
3.276 |
|||||
|
3. |
Foundation |
|
|||||
|
3a. |
Long wall |
2 |
6.2 |
0.9 |
0.55 |
3.069 |
6.138 |
|
3b. |
Short wall |
2 |
2.9 |
0.9 |
0.55 |
1.436 |
2.871 |
|
Total volume of foundation |
9.009 |
||||||
|
4. |
Plinth |
||||||
|
4a. |
Long wall |
2 |
5.9 |
0.6 |
0.45 |
1.593 |
3.186 |
|
4b. |
Short wall |
2 |
3.2 |
0.6 |
0.45 |
0.864 |
1.728 |
|
|
Total volume of plinth |
4.914 |
|||||
|
5. |
Room wall |
||||||
|
5a. |
Long wall |
2 |
5.6 |
0.3 |
3.0 |
5.04 |
10.08 |
|
5b. |
Short wall
Total volume of room wall |
2 |
3.5 |
0.3 |
3.0 |
3.15 |
6.30
16.38 |
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Thank you for going through these calculation steps❤. Have a good day 😄.
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