tunnel's - Trenchless International

Weighing in
on the best cure
Speed of installation was the
focus of a project rehabilitating mixed
water channels in the Rethmar district of
Sehnde, Lower Saxony. The damaged
pipelines lay under the town’s main artery,
the busy B65 motorway. Rehabilitation of
the pipe via open construction methods
would have resulted in considerable traffic
re-routing. Proponent Sehnde Municipal
Utilities issued an invitation to tender
that specified rehabilitation via trenchless
relining.
The job required renewal of 911 m of
mixed water channel in the dimensions of
DN250 to DN1,200. Rohrsanierung Jensen
from Bordesholm was awarded the tender
due to the company’s extensive experience
in pipe rehabilitation. In May 2012, the
channel was rehabilitated in ten sections
under the direction of Andreas Josef.
Challenges coming thick and fast
The biggest challenge of the project was
rehabilitating a section of DN1,200 circular
profile pipe, measuring 205 m. This long
section ran directly under the motorway,
which meant multiple installation pits were
out of the question and the entire section
would have to be relined from a single
installation point.
Based on the existing pipeline damage,
structural engineers calculated the composite
wall thickness required as 12.1 mm. In order
to install a pipe liner with this wall thickness
in a reasonable time, it was initially decided
the only viable curing method could be
‘combination curing’, which works by using
a combination of UV light curing and thermal
curing. However, the disadvantage of this
technology is the time-consuming process;
in order to prevent premature curing of the
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Reline Europe details a project that took place in Sehnde, Germany, in which Rohrsanierung Jensen
installed a 205 m, 20 tonne Alphaliner1500 with UV curing, completing one of the heaviest cured pipe
installations to-date in record time.
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resin, the liner material must be transported
and stored in cool containers. Additionally,
on the construction site a considerable
amount of additional work is required
compared with pure UV light curing.
Rohrsanierung Jensen Managing Director
Stefan Jensen decided on a different strategy,
deciding to use an Alphaliner1500, a newly
developed GFRP liner from manufacturer
RELINEEUROPE. This pipe liner is characterised
by a highly developed, high
level transparency glass resin complex.
In combination with UV curing technology,
Alphaliner1500 with wall thicknesses
exceeding 10 mm can be quickly cured
using pure light.
The liner arrives on-site
On 2 May, the 205 m liner was delivered
to the construction site at 10 am.
The transport case, which measured 6
m long and 2.5 m in height and width,
weighed almost 20 tonnes. A heavy-duty
crane unloaded the liner from the lorry to
the manhole. Four hours later, the pipe
liner was inserted into the channel on a
sliding foil with the help of a conveyor belt,
and the packers were positioned on both
ends of the liner.
Mr Jensen said “For the curing process, we
used the light source that RELINEEUROPE
developed especially for rehabilitating large
profiles, which has a curing performance of
12 x 1,000 watts.”
Mr Jensen invested in this highperformance
curing technology back in
2011. He explains that the technology has
already proven itself on many construction
sites when it comes to quickly curing liners
with large wall thicknesses.
Speedy completion
The liner had been positioned and
calibrated using compressed air within one
hour, allowing a team specialised in the
installation of large liners to start the curing
process at 3 pm.
A curing speed of around 50 cm per
minute was achieved with the powerful
UV light source. The curing process was
completed at 10 pm after around seven
hours of work. At 3 am, the specialists
had completed the milling out of the
supply lines and the rehabilitation of the
connections. In the morning, commuters
driving to work were able to go through
Sehnde without experiencing any traffic
congestion. Sehnde Municipal Utilities’
Claudia Pechtheiden–Meier, who
monitored the project as the contracting
body’s construction manager, was
also satisfied. Rohrsanierung Jensen
completed the project at a record speed
and well within the allocated time frame.
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The pipe rehabilitation team uses a conveyor belt for feeding into the manhole.
“This globally unique curing performance
enables a considerably faster and more
reliable installation of pipe liners, even
when rehabilitating large cross-sections
with high static loads," says Mr Jensen.
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Mr Jensen said the benefits of light curing
with the Alphaliner1500, are “therefore
transferrable on a one-to-one basis for the
rehabilitation of large profiles.”
CIPP
CIPP
October 2012 - Trenchless International
The Alphaliner1500, which weighs 20 tonnes, during the loading process at RELINEEUROPE's premises.
Perfect System:
Light-transparent liner material
and high performance UV-technology
• Diameter DN150 – DN1300 (circular, egg-shaped, special sections) with uniquely
defined wearing layer for optimum endurance
• Curing with innovative new UV-curing technology – with controlled stable UV
radiation power
• Alphaliner 1500 with UV-light transparent liner material – for quick and reliable
curing of high wall thicknesses over 10 mm
With its Alphaliner users RELINEEUROPE uses the unique RE-TQM Total Quality
Management System as an integrated QM system with defined quality guidelines
from the raw material to the completed liner installation, in order to guarantee
the highest level of quality in all cases.
More about us : : www.relineeurope.com
RELINEEUROPE AG : : Große Ahlmühle 31 : : D-76865 Rohrbach : : Fon +49 63 49 93 934-0 : : info@relineeurope.com
October 2012 - Trenchless International
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