Airo X RT Series, Use And Maintenance Manual

Page: 26 / 118

Use and Maintenance Manual - X_RT Series Page 26
3.3.5 Pressure of the machine on ground and load-bearing capacity of ground
Before using the machine, the operator must make sure the floor is suitable for withstanding the specific loads and pressures on
the ground with a certain safety margin.
The following chart provides the parameters in play and two examples of calculation of the average pressure on the ground below
the machine and max pressure underneath the wheels or outriggers (p1 and p2).
SYMBOL U.M. DESCRIPTION EXPLANATION FORMULA
P1
Kg Total machine weight
It represents the weight of the machine, not including
nominal load.
Note: always refer to the details indicated on the plates
affixed to the machine.
-
M Kg Nominal Load The max. load allowed for the work platform. -
A1 cm²
Area occupied on the
ground
Machine supporting area on the ground determined by
the result of TRACK x WHEEL BASE.
A1 = c × i
c cm Track
Cross width of machine measured outside the wheels.
or:
Cross width of machine measured between levelling
outrigger centres.
-
i cm Wheel base
Longitudinal length of machine measured between wheel
centres.
or:
Longitudinal length of machine measured between
levelling outrigger centres.
-
A2 cm²
Wheel or levelling
outrigger area
Wheel or levelling outrigger ground support area. The
wheel support area on the ground must be verified
empirically by the operator; the levelling outrigger support
area depends on the shape of the support foot.
-
P2 Kg
Max. load on wheel or
levelling outrigger
This represents the max. load that can be discharged
onto the ground by a wheel or by a levelling outrigger
when the machine is in the worst position and load
conditions. Note: always refer to the details indicated on
the plates affixed to the machine.
-
p1 Kg/cm² Pressure on ground
Average pressure placed on the ground in idle conditions
and supporting the nominal load.
p1 = (P1 + M) / A1
p2 Kg/cm² Max specific pressure
Max. pressure which a wheel or a levelling outrigger can
place on the ground when the machine is in the worst
position and load conditions.
p2 = P2 / A2