Let us consider a plinth beam as shown in the below-given drawing.
Given data:
Room size = 2.5m. × 3.5m.
PB1 size = 0.3m × 0.38m.
PB2 size = 0.3m × 0.45m.
Before proceeding further, Go through the article👇
👀. How to calculate the cost of plinth beams for a building?
1. Plinth beam concreting:
The labor rate of plinth beam concreting will be between INR 500/- to 900/- per CUM.
Let us take the average rate of INR 700/- per CUM.
The labor cost of plinth beam concreting
= [total vol. of concrete in CUM × rate/CUM.]
=[1.677CUM × 700/-]
= INR 1173.90/-
Note: The vol. of concrete is taken from the above-linked article.
2. Reinforcement:
The labor rate of plinth beam reinforcement work will be between INR 8/- to 14/- per kg.
Let us take the average rate of INR 11/- per kg.
The labor cost of plinth beam reinforcement
= [total wt. of steel in kgs. × labor rate/kg.]
= [ 229 kg. × 11/-]
= INR 2519/-
Note: The wt. of steel is taken from the above-linked article.
3. Formwork:
The labor rate for formwork is decided by the following 2 methods.
a. Labor rate/ sq m of formwork:
The labor rate of plinth beam shuttering work will be between INR 9/- to 15/- per sq ft.
Let us take the average rate of INR 12/- per sq ft.
or INR 130/- per sq m.
Total length of PB1 = {2nos. × 2.5m.} = 5m.
Total length of PB2 = {2nos. × 4.1m.} = 8.2m.
Total length of plinth beams = length of { PB1 +PB2} = 13.2m.
Shuttering area of PB1
= [( 1no. × bottom side )+ (2nos. × depth side.)] × total length
= [ ( 1no. × 0.3m. )+ (2nos. × 0.38m.)] × 5m.
= [ 0.3m + 0.76m.] × 5m.
= 1.06m × 5m.
= 5.3 sq m.
Shuttering area of PB2
= [( 1no. × bottom side )+ (2nos. × depth side.)] × total length
= [ ( 1no. × 0.3m. )+ (2nos. × 0.45m.)] × 8.2m.
= [ 0.3m + 0.9m.] × 8.2m.
= 1.2m × 8.2m.
= 9.84 sq m.
The total area of shuttering work
= [(shuttering area of PB1) + (shuttering area of PB2)]
=[ (5.30 sq m.) + ( 9.84 sq m.)]
= 15.14 sq m.
The labor cost of plinth beam formwork
= [total area of formwork in sq m. × labor rate/sq m.]
= [ 15.14 sq m. × 130/-]
= INR 1968.2/-
Alternate method:
b. Labor rate/ r mt. of formwork:
The labor rate of plinth beam shuttering work will be between INR 11/- to 17/- per RFT.
Let us take the average rate of INR 14/- per RFT.
or INR 150/- per RMT.
The labor cost of plinth beam formwork
= [total length of formwork in RMT × labor rate/RMT.]
= [ 13.2m. × 150/-]
= INR 1980/-
Note:
The cost calculated by the alternate method ( INR 1980/-) is nearer to the first method ( INR 1968/-)
4. The total labor cost of plinth beam
= cost of [ concreting + reinforcement + formwork]
= [1173.90/- + 2519/- + 1968.20/-]
= INR 5661/-
To go through rate analysis & cost-related articles, click here.
Thank you for going through this article❤. Have a good day 😄.
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