57
Geberit Drainage Systems
Buried drain systems
7.2
Trench details
20 cm
HS
P
C
B
Fig. 2
Loadings on buried pipes need to be carefully calculated.
Please contact Geberit on 0800 077 8365 for assistance
calculating loadings on Geberit drainage pipes.
For all trenching work the local guidelines, standards and
regulations must be observed.
Important for underground installation is correct laying of
the pipe in the trench, as well as careful consideration of
the following.
B = Bedding
The pipe must have a bedding of at least 100mm.
C = Consolidation
Side fill to upper edge of pipe.
P = Protective layer
With trench profile 1A cover to above top edge of pipe
over entire width of trench - minimum 300mm. Maximum
40mm stone sile, no heavy compaction equipment.
Filling material
Granular material to BS 882 or similiar to be used.
Example: 10mm nominal single size shingle is suitable for
pipes up to 300mm. 14mm nominal single size shingle
is suitable for pipes 125mm to 300mm. 20mm nominal
single size shingle is suitable for pipe 200mm to 300mm.
min. 60 cm
20 cm
D
HS
P
C
B
Fig. 1
Behaviour:
Flexible.
Fill material
Granular material.
Behaviour:
Flexible.
Fill material
Granular material.
D
10 cm
B
A
D
A=D + min. 100 mm
Fig. 3
Behaviour:
Rigid.
Fill material
Concrete.
Refer to BS EN 1295-1 for more details
