Kessel EasyClean ground NS 1 Instructions De Pose Et D'utilisation page 29

4.9 Backfill the excavation pit
CAUTION
Chamber installation for load class D requires a load distribution plate made of reinforced concrete.
Note the structural calculations for traffic safety.
Determine the required load class and structural calculations in accordance with the environment / use condi-
tions.
Note the relevant reinforcement plan on the KESSEL website.
(1) Heavy-duty paving with a gravel base
(2) Stable sublining (e.g. concrete ring)
(3) Base course (for load class A and B)
Load distribution plate (for load class D)
(4) Polystyrene layer
(5) Back fill material (crushed stone)
As an alternative to the structure shown in the image, the load distribution plate (3) can also be installed up to ground level.
Fill the excavations with crushed stone (0-16 mm diameter), at least 50 cm all around; place in layers of maximum 30 cm
and compact each layer of fill material properly to 97% DPr (e.g. using vibrating plate).
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 car-
ried out in accordance with EN 4124.
010-298E
(6) Ground
(7)
(8) Tank bed (sand)
(9) Subsoil (crushed stone)
Installation and operating instructions 29 / 108