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22. Crane operation when the outriggers are used
(1) Outrigger reaction forces
Never operate the crane on soft ground. The ground must be
reinforced appropriately for supporting the crane
(
such as by
using steel plates to increase the supportable load).
In order to properly reinforce the ground to ensure the crane can
be operated safely, it is necessary to determine how much force
the ground can support. In other words, it requires calculating
the outrigger reaction force.
(2)
Improve the ground surface as far as possible if it is soft, crumbly, uneven or sloping. Use wooden blocks etc. if
necessary to produce a flat surface and then set the outriggers on steel plates etc. of adequate areas and rigidity to
reduce surface pressure further.
(3)
Ground which appears to be strong can have dangerously inadequate strength due to ground conditions below the
surface. Avoid areas which are likely to suffer such problems as listed below, and set the outrigger floats on steel
plates etc. of adequate areas and rigidity to guard against potentially weak soil.
・
Surfaces paved with plain asphalt
・
Surfaces paved with thin concrete
・
Brick or cobbled road surfaces
・
Areas where soil under the road paving has been eroded by water to leave a void
・
Areas where the soil is very dry but soft
・
Road shoulders or near construction excavations
Set the crane level with full consideration for the above points.
If the crane is not set level, the reduction in the crane's lifting capacity can be unexpectedly
severe. If you use the crane without noticing and correcting the inclination, it could tip over or
the boom could be broken even if the load is well below the lifting capacity.
(541A-0180-2E)
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