SOIL EXCA>=2‐4.5 M DEPTH_MANUALLY Manual excavation Wherever mechanical excavation is not feasible below ground level in foundation, trenches, walls, columns etc. in all classes of soil including soft & hard murram, wet soil etc. except rock and hard rock up to a specified depth, dressing of sides and ramming of bed , spreading, levelling, compacting in plinth and disposal of surplus excavated soil as per the specifications and as directed by engineer in charge within a lead of 5.0 KM.
Rate Analysis for Manual Excavation:
1. Scope of Work
- Depth: 2–4.5 meters
- Nature of Excavation: Manual excavation in all types of soil except
rock and hard rock.
- Inclusions:
- Dressing of sides
- Ramming of bed
- Spreading, levelling, and compacting in
plinth
- Disposal of surplus soil within a lead of 5
km or plant boundary.
2. Components of Rate Analysis
a. Labor Cost
Manual excavation relies
heavily on labour. The manpower required depends on soil type and depth. A
typical breakdown includes:
- Unskilled Labor: For digging, dressing, and ramming.
- Skilled Labor: For supervision and quality control.
|
Labor Type |
Quantity (Nos) |
Rate per Day (in
currency) |
Total (in currency) |
|
Unskilled Labor |
X |
Y |
XY |
|
Skilled Labor |
Z |
W |
ZW |
b. Tools and Tackles
Common tools like
pickaxes, shovels, spades, and wheelbarrows are required. Consider depreciation
or rental costs.
|
Tool/Equipment |
Rate per Day (in
currency) |
Usage Factor (Days) |
Total (in currency) |
|
Tools and Tackles |
A |
B |
AB |
c. Lead and Lift
Disposal of surplus soil
involves:
- Loading and transportation within a lead of 5
km.
- Unloading at the designated site.
- Use transportation charges for vehicles like
tippers or tractor-trailers.
|
Item |
Quantity (m³) |
Rate per m³ (in
currency) |
Total (in currency) |
|
Transportation |
C |
D |
CD |
d. Overheads and Contingencies
Add an overhead and
profit margin to account for administrative costs, risks, and profit.
|
Component |
Percentage (%) |
Base Amount (in
currency) |
Total (in currency) |
|
Overheads and Profit |
P% |
(Labor + Tools + Transport) |
(P/100) * Base |
3. Formula for Rate per Cubic Meter
Total Cost per m³ =
(Labor Cost + Tools & Tackles + Transportation + Overheads & Profit) /
Volume
4. Factors Affecting Cost
- Soil Type: Soft soil requires less effort than hard murram or
wet soil.
- Depth: Greater depth increases difficulty and time
required for excavation.
- Lead Distance: Disposal cost increases with lead distance
beyond 5 km.
- Local Wage Rates: Labor cost varies regionally.
- Site Conditions: Restricted spaces or water-logged sites may
add challenges.
5. Example Calculation
Assume:
- Volume to be excavated: 10 m³
- Unskilled labour: 4 persons/day at 500 each
- Skilled labour: 1 person/day at 700 each
- Tools: 200 per m³
- Transport: 150 per m³
- Overheads: 15%
Calculation:
- Labor Cost: (4 × 500 + 1 × 700) × Days = 2700
- Tools Cost: 200 × 10 = 2000
- Transport Cost: 150 × 10 = 1500
- Overheads: 15% × (Labor + Tools + Transport) = 15% × 6200 =
930
Total = Labor + Tools +
Transport + Overheads = 6200 + 930 = 7130
Rate per m³ = Total / Volume = 7130 / 10 = 713 per m³
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