inform 11.2011 e (pdf file 2 MB) - Duktus

PAGE 12 | INFORM NO. 3 / 2011
from the pumping station to the river Lippe
A 1,200 mETRE SEWER PIPELINE fROm DUKTUS ENABLES fLOW INTO A RECEIvING WATERCOURSE
TO BE REGULATED
As a result of the effects of mining-related subsidence,
the Gecksbach stream near Lippramsdorf
– a village close to the town of Haltern am See in
North Rhine-Westphalia – could no longer find its
way unaided into the river Lippe. The lower
course of the stream has therefore had to be
moved. In future, the stream will flow to a new
pumping station and from there will be pumped
into the receiving watercourse via a 1,200 metre
long pressure pipeline. The client is the Lippeverband,
the body managing the central and lower
Lippe. The operation is costing millions of Euros
and the construction work for it began in autumn
2010. Duktus DN 600 sewer pipes with BLS®
joints were used for the installation of the pressure
pipeline. In its planning work, the Lippeverband
had to allow for the subsidence which can
still be expected, because coal-mining is still going
on in the region. In view of these ground conditions,
the safety margins offered by the pipes
had to meet very stringent requirements, as the
pipeline will have to withstand the imponderables
due to the unstable ground. As Duktus Sales
Manager Jürgen Schütten explains, “This was
also the reason why the Lippeverband opted for
wall-thickness class K 9, to make sure that it
would be on the safe side in the long term. The
trench for the pipeline was constructed with watertight
sheet-pile shoring. The operation was a
challenging one and made special demands on
Duktus’s Application Engineering Division. As
The ductile iron pipes being connected into the manhole
structure
The DN 600 cast iron pipeline passing through the manhole
structure
well as the instruction of the site personnel, there
were also complicated details which had to be
settled. To meet the requirements imposed by the
mining subsidence conditions, travels under traction
and thrust had to be checked and suitably
tailored so that the amounts of movement required
could be made available by means of the
existing tolerances at the sockets and some additional
collars which would be needed. Once
again, Duktus showed its expertise as an adviser
and partner for the planners and the companies
doing the installation work when demanding underground
installation projects are being carried
out.” The Haltern-Lippramsdorf pumping station
went into operation early in April 2011. The job of
laying the pressure pipeline, which was completed
in June, was handled by Böwingloh & Helfbernd
GmbH of Verl.
Drinking water supply in the
north of the Black forest
mORE ThAN ThREE KILOmETRES Of DUKTUS zmU PIPES ARE ImPROvING
ThE DRINKING WATER SITUATION AROUND BAD TEINACh-zAvELSTEIN
To improve the drinking water supply to Bad Teinach-Zavelstein
and other surrounding municipalities,
local water utilities have decided to enter into
a co-operative agreement with the large neighbouring
utility Zweckverband Schwarzwald-Wasserversorgung
and to expand the pipeline networks
in three sections of installation work. More
than three kilometres of
150 nominal size Duktus
ZMU pipes with BLS®/
VRS®-T joints are being
laid for this. The ductile
iron pipe is an accepted
standard at the Zweckverband.
For years, this drinking water supplier,
which sends out around 2.2 million cubic metres
of excellent water from the region every year, has
been putting its trust in the durability and strength
of the ductile material. The majority of the pipelines
are being laid using the open trench tech-
nique. “The cement mortar coating of the pipes
saves money for clients because the soil dug out
can all be backfilled and no additional bedding is
needed for the pipes. As well as the immaculate
corrosion protection that the ZMU coating provides,
this was the reason why it was decided to
lay all the sections in this grade of pipe”, Duktus
Sales Manager Alexander Bauer tells us. In September
2011, some 200 metres of the future connecting
pipeline to the Zavelstein high-level service
reservoir was laid by the directional drilling technique.
The consulting engineers, Alwin Eppler of
Dornstetten, had opted for this variant laying technique
because there was an old asbestos cement
pipeline in the region concerned which needed to
be replaced. “By laying by the directional drilling
technique we were able to do the work at low cost
and avoid any harmful effects on the environment”,
says Willi Ruderisch, CEO of Flammer of
Mössingen which did the installation work.
A 200 metre long section of the future connecting pipeline to the Zavelstein high-level service reservoir was laid by the directional drilling
technique. An old asbestos cement pipeline was replaced at this point