Common Manhole Cover Sizes
The diameter of circular manhole covers typically increases in increments based on a 50cm base unit:
- Light-duty manhole covers: 60cm (commonly found on sidewalks).
- Standard manhole covers: 70-75cm (most common on vehicle lanes).
- Heavy-duty manhole covers: 80-90cm (specifically for main roads).
Scenario-Based Selection Guide
- Pedestrian areas: A 60cm diameter is sufficient to withstand pedestrian weight.
- Residential roads: 70cm balances cost and load-bearing requirements.
- Main traffic arteries: 80cm or larger ensures safe passage for heavy vehicles.
Intelligence in Design
The advantages of circular manhole covers go beyond just size:
- Non-directional: No need to adjust the angle during installation.
- Even stress distribution: The circular structure distributes pressure more effectively.
- Anti-fall design: Most have flanged latches to prevent falling.
