📊 BOQ & Quantity Calculation in Road Construction – Complete Practical Guide for Site Engineers
Introduction
Road construction में BOQ (Bill of Quantities) और quantity calculation सबसे important part है। यही project की cost, billing और planning decide करता है।
👉 “Accurate Quantity = Accurate Payment”
What is BOQ?
BOQ (Bill of Quantities) एक document होता है जिसमें project की सभी items और उनकी quantities दी होती हैं।
Why Quantity Calculation is Important?
Contractor billing
Material planning
Cost estimation
Progress tracking
Basic Formula for Quantity
Volume = Length × Width × Thickness
👉 Unit: cubic meter (m³)
Road Layer-wise Quantity Calculation
1. Subgrade
Quantity = L × W × Thickness
2. GSB
Example:
L = 100 m
W = 7 m
T = 0.2 m
👉 Qty = 100 × 7 × 0.2 = 140 m³
3. WMM
Same formula apply
4. Bituminous Layer (DBM/BC)
👉 Quantity (tonne) = Volume × Density
5. PQC
Qty = L × W × Thickness
Measurement Book (MB) Entry
| Item | L | W | T | Qty |
|---|
Conversion Tips
1 m³ aggregate ≈ 1.5–1.7 ton
Bitumen density ≈ 1.0–1.1 ton/m³
Common Mistakes
❌ गलत dimensions
❌ Overlapping count
❌ Thickness error
Site Engineer Responsibilities
Accurate measurement लेना
MB entry maintain करना
Cross-check करना
Practical Tips
✔ हमेशा drawings refer करें
✔ Site measurement verify करें
✔ Excel use करें
Conclusion
BOQ और quantity calculation road construction का financial backbone है। Proper calculation से project profitable और smooth चलता है।
Final Words
👉 “Right Quantity = Right Profit” 💰🚧