3.2-2 Preparing for crane operation
The necessary support area can be roughly calculated as follows. The values for the supporting force can be
found in the Technical Sheets of the respective crane.
Supporting force F (N)
Support area A (cm²) = ----------------------------------------------------------
Load-bearing capacity of the ground (N/cm²)
Permissible pressure on the ground (load-bearing capacity of the ground) to DIN 1054
A Filled ground, not artificially compacted
0-10 N/cm²
C Asphalt
20 N/cm²
B Established, evidently undisturbed ground
1. Mud, peat, marshy ground 0 N/cm²
2. Non-cohesive, adequately firmly established ground:
Fine to medium sand 15 N/cm²
Coarse sand to gravel 20 N/cm²
Crushed stone compacted 25 N/cm²
3. Cohesive ground:
mushy 0 N/cm²
soft 4 N/cm²
firm 10 N/cm²
half-solid 20 N/cm²
hard (solid) 30 N/cm²
4. Rock:
weathered 100 kN/m²
If the support width is inadequate or if the support sinks into the ground
the danger of the vehicle tipping over is acute.
In order not to add to the load on the support when loading the vehicle the support cylinders must be
retracted as required.
During unloading the support cylinders may lift and they must be readjusted accordingly.
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