Let us calculate the cost of excavation & dumping at the construction site as shown below.
Given data:
Length of excavation = 50m.
Depth of excavation = 1.5m.
Width of excavation = 6m.
Dumping distance = 1.5km.
Calculation:
Let us use JCB-3DX for the excavation purpose & tipper truck of 10m³ capacity.
1. Excavation cost:
The volume of the excavation
= [length × breadth × depth]
= [ 50m. × 6m. × 1.5m.]
= 450m³.
The market rate for the JCB excavation is INR 900/- to INR 1200/- per hour., depending upon the regional availability & demand.
Let us consider an average rate of INR 1050/- per hour, for the calculation purpose.
The excavation capacity of the JCB ranges from 30m³ to 50m³ per hour, depending upon the type of soil.
Let us consider an average excavation capacity of 40m³/ hour for the calculation.
The cost of excavation
= [(Total vol. of excavation ÷ excavation capacity/hr. ) × JCB rate/hr.]
= [(450m³ ÷ 40m³/ hour ) × INR 1050/-]
=[11.25hour × 1050/hour ]
= INR 11,812/-
2. Dumping cost:
The distance of the filling area is 1.5km. from the excavated site.
The total distance traveled by a tipper truck
= up & down of 1.5km. = [2 × 1.5km.] =3km.
The tipper truck nearly takes 15min.(0.25hr.) to travel the distance of 3km.
The excavated volume by JCB = 40m³/ hour
Therefore no. of trucks needed/hr.
= [excavated vol./hr. ÷ tipper capacity]
= [ 40m³ ÷ 10m³]
= 4 nos.
JCB takes 15min. ( 0.25hr.) to load one truck of 10m³ capacity.
So, the total time consumed by a tipper/trip
= [loading time + traveling time]
= [0.25hr. + 0.25hr.]
= 0.50hr.
This suggests taking 2no. of trucks without keeping the JCB in an idle position.
The market rate for the tipper truck is INR 300/- to INR 500/- per trip, depending upon the regional availability & demand.
Let us consider an average rate of INR 400/- for calculation purposes.
Note:
The tipper rate/trip depends upon the distance traveled. The above-mentioned rate is for the distance within 2km.
The cost of dumping
= [(Total vol. of excavation ÷ tipper capacity )× soil bulking factor × tipper rate/ trip]
= [(450m³ ÷ 10m³ ) ×1.15 × INR 400/-]
=[45 trips × 1.15 × INR 400/- ]
= INR 20,700/-
Note:
The bulking factor is the percentage of volume change of excavated material (due to expansion) to the original volume before excavation.
The bulking factor differs from soil to soil & degree of compaction. However, for the calculation purpose, an average bulking factor i.e. 1.15 is considered.
The total cost of excavation & filling
= [excavation cost + dumping cost]
= [ 11,812/- + 20,700/-]
= INR 32,512/-
Note:
Insert the market rate of your region in the above procedure to estimate the correct cost.
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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