Palfinger PK 34002-SH P7, Original Operating Manual

Page: 167 / 260

Chapter 7 Preparing for crane operation
161
Ground condition
Check the floor for the following:
x
Stability.
x
Cavities (manhole covers, pipelines, etc.).
x Sufficient distance to any drop offs, holes, ditches, etc.
x
Ground inclination 5° maximum in all directions.
Increase the support area according to the supporting surface conditions (refer to table) or find a
suitable supporting surface.
Max 5°
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 to medium sand 15 N/cm² (21.75 psi)
Coarse sand to gravel 20 N/cm² (29 psi)
Stabilized crushed stone 25 N/cm² (36.25 psi)
3 Cohesive soils:
Pappy 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’.