Chapter 7 Preparing for crane operation
Ground pressure
Ground pressure by support jacks max. 400 N/cm² (58 psi).
Permissible ground pressure under DIN 1054
Heaped up soil, that was not stabilized artificially.
0 - 10 N/cm² (0-14.5 psi)
Asphalt
20 N/cm² (29 psi)
Grown, obviously untouched soil.
1. Mud, turf, marsh
0 N/cm² (0 psi)
2. Incohesive soils:
Fine sand to medium sand
15 N/cm² (21.75 psi)
Coarse sand to gravel
20 N/cm² (29 psi)
Compacted gravel
25 N/cm² (36.25 psi)
3. Cohesive soils:
Mushy
0 N/cm² (0 psi)
Soft
4 N/cm² (5.8 psi)
Stiff
10 N/cm² (14.5 psi)
Semisolid
20 N/cm² (29 psi)
Hard (solid)
30 N/cm² (43.5 psi)
4. Rock:
Weathered
100 N/cm² (145 psi)
Determining necessary support area (use metric or imperial consistently):
Support area A [cm² or in²] =
Supporting force F [N or lbs]
Load capacity of the soil [N/cm² or psi]
The supporting force values are specified in chapter 13, ‘Technical Sheets’.
Note!
High-quality supporting pads are available from all
PALFINGER partners.
Caution!
If the movement ranges of the supports are not completely
in view of the operator there is an acute risk of accident and danger to
life.
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Summary of Contents for PC 3800
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