1. What is Ground Bearing Pressure?

Ground Bearing Pressure (GBP) is the pressure exerted by a crane or heavy equipment on the ground surface. It's a critical safety parameter for Demag cranes to ensure the ground can support the load without failure or excessive settlement.

2. How Does the Calculator Work?

The calculator uses the GBP formula:

Where:

• \( GBP \) — Ground Bearing Pressure (kPa)
• \( total\_weight \) — Total weight of the crane and load (kg)
• \( contact\_area \) — Contact area between crane and ground (m²)

Explanation: The formula calculates the pressure distribution by dividing the total weight by the contact area with the ground.

3. Importance of GBP Calculation

Details: Accurate GBP calculation is crucial for crane safety operations. It helps determine if the ground conditions can safely support the crane's weight and load, preventing accidents, ground failure, and equipment damage.

4. Using the Calculator

Tips: Enter total weight in kilograms, contact area in square meters. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is a safe GBP value for Demag cranes?
A: Safe GBP values vary based on ground conditions. Typically, 50-150 kPa is acceptable for firm ground, while softer soils may require lower pressures.

Q2: How do I measure contact area accurately?
A: Contact area should include the entire surface area of outrigger pads or crawler tracks that are in contact with the ground.

Q3: Does GBP calculation include dynamic loads?
A: For precise calculations, dynamic loads from wind, lifting, and movement should be considered in addition to static weight.

Q4: What ground preparation may be needed for high GBP?
A: For high GBP values, ground may need compaction, matting, or cribbing to distribute the load and prevent ground failure.

Q5: How often should GBP be calculated on site?
A: GBP should be calculated whenever crane setup conditions change, including different loads, positions, or ground conditions.