Kessel Aqualift XL Basic Einbau- Und Betriebsanleitung Seite 29

4.8 Backfill the excavation pit
CAUTION
Note the structural calculations for traffic safety.
Chamber installation for load class D makes a load
distribution plate made of reinforced concrete nec-
essary (exception: not necessary for standard road
construction).
Determine the required load class and structural
calculations in accordance with the environment /
use conditions.
Request an appropriate reinforcement drawing
from the KESSEL hotline.
To fix the base section in place correctly, surround with
lean concrete (see lean concrete wedge (1)).
Fill the excavations with crushed stone (0-16 mm diam-
eter), at least 50 cm all around; place in layers of maxi-
mum 30 cm and compact each layer of fill material prop-
erly to 97% Dpr (e.g. using vibrating plate). At the same
time, fill the tank with water so that the maximum dif-
ference between the liquid level and the level of the fill
material is 30 cm.
The required excavation pit slope angle β must be
observed all the way round.
The assignment of internal frictional angle φ of the fill
material and permissible excavation pit slope angle β
must be carried out in accordance with EN 4124.
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