KLUBB KAT 42 - Page 16

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2.2 CONDITIONS FOR OPERATION
ASSESSMENT OF THE GROUND
Analysis of the ground can consist of a visual inspecon of the surface or a detailed geotechnical survey.
Nevertheless, it is essenal that the assessment be carried out by personnel with enough experse and experience to be aware
when advice must be sought from someone more skilled.
Assessing the load capacity of the underlying ground
is the primary task of a civil engineer.
1) Loose ground
All forms of loose ground, including just laid
surfacing (gravel, sand, mud, etc.) must be
avoided.
2) Non-compacted lling material
Areas of ground may have been lled with soil or
other materials without it being properly
compacted. Cracks appearing around the
perimeter of a dug area are signs that the area
has not been properly compacted.
3) Proximity to dug areas
The machines must not be posioned near the edges of earthworks or other excavaons as they are likely to subside
without warning. If the machine has to be posioned near the edge of a slope or a dug area with the outriggers or wheels
in a ‘hazardous area’, a technical assessment report should be sought from a skilled geotechnical engineer before seng up
the MEWP and rendering it operaonal.
The safety distances and slope angles stated must be maintained (see drawing).
A - Safety distance
B - Hole/trench depth
C - Distance from the edge of the embankment
- If the truck/machine assembly has a GVW of up to 12t, the distance must be …..≥ 1.00 m
- If the truck/machine assembly has a GVW of over 12t, the distance must be …….≥ 2.00 m
Y - Load transfer angle
- If “Y” ≤ 30° on ground which is loose or non-compacted ……………………….. “A” ≈ 2 x “B”
- If “Y” ≤ 45° on compacted ground ……………………………….……………............. “A” ≈ 1 x “B”
X - Embankment angle
Unless the stability is proved mathemacally, the following embankment angles must not be exceeded:
a) for non-compacted or loosely compacted ground …………………….………..“X” = 45°
b) for rm ground or semi-solid, compact ground, ……………………….….…….“X” = 60°
c) for rock …………………………………………………………………….……………………….. “X” = 80°
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