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6.
Load categories
6.1
Installation under surfaces suitable for pedestrian loading
When installing under surfaces designed for pedestrian loading, it is imperative to prevent any kind of ve-
hicle from driving over the area. This should be achieved through structural measures or effective cordoning
off. It is important to note that the layer structure in green spaces above the infiltration system differs from
surfaces designed to withstand traffic loading, as outlined in section
and max. earth coverings are stated in Table 1 and Table 2.
6.2
Green spaces above the infiltration system
When establishing a lawn above the infiltration element, it is recommended to cover the system with either
a water-impermeable film or a layer of clay approximately 100 mm thick. This precautionary measure is
essential to prevent the specific area above the infiltration system from drying out more rapidly than the rest
of the
lawn.
6.3
Installation under surfaces suitable for vehicle loading
The minimum and maximum earth coverings differ depending on the various loading classes: car, truck 12,
HGV30, HGV40 and HGV60. Table 1 shows the min. and max. earth coverings for the various load cate-
gories. Deviating installation situations should always be discussed with GRAF.
Fillers (reused excavated material and/or gravel) with a maximum density of 20kN/m³ are needed.
Category
Pedestrian
Earth covering
(min.) [m]
Earth covering
(max.) [m]
* Angle of friction
30°
** Angle of friction
The installation depth also depends on the load categories and the friction angle of the backfill used.
Table 2 - Maximum installation depths (bottom edge of block)
Category
Pedestrian
Installation
depth (max.)
[m],
= 20°
Installation
depth (max.)
[m],
= 30°
Installation
depth (max.)
[m],
= 40°
For additional information on the installation of infiltration ditch elements under traffic areas up to HGV60,
please refer to the sections 9 and 10.
6. Load categories
Table 1 - Earth coverings
Car traffic
0.25
0.25
2.75
2.75
35°
Car traffic
3.00
3.00
4.25
4.25
5.00
5.00
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Truck 12
HGV30
0.50*
0.50*
2.75
2.50
Truck 12
HGV30
3.00
4.25
5.00
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6.2.The possible installation depths
HGV40
0.50**
2.25
HGV40
2.75
2.50
3.75
3.75
5.00
5.00
HGV60
0.80**
2.00
HGV60
2.25
3.25
5.00
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