59
Geberit Drainage Systems
Buried drain systems
Principal:
Any variation in length must be prevented by embedded
fixed points in concrete (e.g. electrofusion couplings,
branches, bends or collar bushes) or by the provision
of corresponding fixed point structures.
7.4
Rigid installation -
Embedded in concrete
Embedding in concrete
Basically, Geberit HDPE material absorbs within itself
thermal movement due to its high elasticity. In the case
of large diameters however (e.g. 315mm) the forces
<<
P
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(resulting from expansion and contraction) are
considerable. They must be absorbed by the embedded
fixpoints alone, since cement/concrete will not adhere to
Geberit HDPE pipework.
Reduced small branches of large pipe diameters must
be secured by an additional anchor point (electrofusion
couplings or collar bushes) in order to prevent shearing
off the branch.
Important:
Under no circumstances should a ring seal
or expansion socket be embedded in concrete.
Since the fitting has to act as a fixed point, do not insulate it.
Pipes should be embedded such that there is a minimum of
40mm between the top of the pipe and the finish of the
filling material.
Branch equal
Branch equal with
reducer
