TPT November 2010

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92 November 2010 ›
Cutting, Sawing & Profiling
GUAZZONI
waterjet laser services
tel. 0331 962642 email: info@guazzoni.it
Tunnel pipe
optimises flow
properties
of plastic
drainage pipes
DRAINAGE pipes have to meet ever more
severe requirements in the under-drainage
of traffic structures and underground
engineering. This is due to changing weather
conditions with less frequent rainfalls yet
considerably more water per rainfall. The
collection, drain and seepage of surface
water and soakage needs optimised drain
systems able to cope with the floods.
Tunnel-shaped drainage pipes have
been used for nearly 35 years, to cope with
huge amounts of water. These are mostly
made from PVC since plastic provides high
annular rigidity.
The flat bottom of the pipe in contact with
the soil makes for a better drainage than single
walled pipes with fully circular corrugation. The
German DIN standard, increasingly adopted
in European countries, refers to this as Type
C1 with profiled inner and outer surface and
smooth flat flow bottom.
To meet the increasing demand of
the market for tunnel shaped drain pipes
of plastic, Unicor GmbH has developed
new tools for the UC 250 and UC 315
corrugators. A newly developed perforating
process allows these machines to produce
tunnel pipes with an OD of DN 100 at a rate
of up to 11 metres per minute.
Another benefit of the UC 250 and UC
315 is that at constantly high speeds the
sockets can also be produced inline. This
dispenses completely with the need for a
separate production step.
Unicor GmbH – Germany
Email:
Website:
Insights into a mould block with the typical tunnel profile and a tunnel-shaped drainage pipe