Palfinger PK 23002, Operator'S Manual

Page: 31 / 94

Preparings for crane operation 3.2-2
The necessrary 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 N/cm²
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.