1. What is Ground Bearing Pressure?

Ground Bearing Pressure (GBP) is a critical measurement in crane operations that indicates the pressure exerted by the crane on the ground surface. It's essential for ensuring safe crane setup and preventing ground failure.

2. How Does the Calculator Work?

The calculator uses the GBP formula:

Where:

• \( total\_weight \) — Total weight of the crane including load (kg)
• \( contact\_area \) — Total contact area between outriggers and ground (m²)

Explanation: The formula calculates the pressure distribution by dividing the total weight by the contact area, giving the pressure in kPa.

3. Importance of GBP Calculation

Details: Accurate GBP calculation is crucial for crane safety, preventing ground subsidence, ensuring stability during lifting operations, and complying with safety regulations.

4. Using the Calculator

Tips: Enter total weight in kilograms and 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 crane operations?
A: Safe GBP values depend on ground conditions. Typically, values below 50-100 kPa are safe for firm ground, while softer ground may require lower pressures.

Q2: How do I measure contact area accurately?
A: Contact area should include all outrigger pads or crawler tracks in contact with the ground, measured in square meters.

Q3: Does the load weight include the crane itself?
A: Yes, total weight includes the crane's weight plus any additional load being lifted.

Q4: What factors affect ground bearing capacity?
A: Soil type, moisture content, compaction, and recent weather conditions all significantly impact ground bearing capacity.

Q5: When should I use crane mats?
A: Crane mats should be used when calculated GBP exceeds the safe bearing capacity of the ground or when working on sensitive surfaces.