Rigging work
12.2 Choosing a suitable site
Operating manual GMK 6400 3 112 993 en 12 - 11
12.07.2013
Ground bearing area
• Now calculate the required ground bearing area
• Check that the surface of the outrigger pad (à p. 1 - 15) is larger than the
calculated ground bearing area. If the surface of the outrigger pad is
smaller, you will need to enlarge the ground bearing area
Example for calculating the required ground bearing area:
If the outrigger pressure is 25 t and the ground has a bearing capacity of 40 t/m
2
,
then the required ground bearing area for this supporting cylinder is 0.625 m
2
(= 6250 cm
2
).
If the outrigger pad has a surface of 2 000 cm
2
, you would need to enlarge the
ground bearing area by packing the outrigger pads; Ã p. 12 - 44.
G
Danger of overturning if the ground bearing area is too small
Ensure that the actual ground bearing area is at least as large as specified
in the table.
This prevents the ground from giving way and the truck crane from over-
turning.
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