Trenchless Renovation - Out of Sight, Out of Mind: Dresden, Germany, Relines Old Town Collector with Hobas NC Line®
Dec 11, 2009
Stadtentwässerung Dresden GmbH, a subsidiary of the Saxon State Capital Dresden and GELSENWASSER AG, is responsible for the collection and treatment of wastewater. The area at the Elbe River counts 500.000 inhabitants who consume an average of 100 l water per day. Including stormwater, around 60 million m3 of wastewater are collected and then treated in the Dresden-Kaditz treatment plant per year. These are in other words 120.000 m3 of wastewater on a dry day. A quick and safe discharge of this big quantity of water requires a well functioning sewer system. Parts of the network are, however, over 100 years old and constantly need to be repaired and renovated. Since 1990 Stadtentwässerung Dresden GmbH has invested 575 million Euros in the renovation and expansion of the sewer network as well as water treatment plants.
The contractors paid particular attention to meeting the required quality parameters and to technological processes. The existing pipe was first inspected and calibrated by laser scan and manually with a mold to determine the exact outer dimensions of the future profiles. This was necessary to maximize the capacity of the new sewer while ensuring an easy installation. A precise plan including standard and short profiles and some with special oblique couplings was worked out.
Because the condition of the existing sewer is categorized class III, the calculations by LGA Nürnberg / Ingsoft GmbH were carried out with due consideration of the special geometry and the grouting procedure. Here it proved advantageous that HOBAS NC Line® Profiles are manufactured with definable wall thicknesses, which keeps statically inconvenient imperfections to a minimum. Since the profiles are produced at the factory, there is no subsequent shrinkage that could lead to circular cracks. Because deformations due to inconsistencies in the old sewer are not transferred to the new pipe as would be the case with cured-in-place relining methods these need not be considered.
|Year of Construction||2009|
|Construction time||5 months|
|Total length of pipe||HOBAS Pipe: 880 m|
|Pressure Class||PN 1|
|Diameter||2157 x 2129, 2242 x 2195 mm inner diameter (wall thickness 32 mm)|
|Installation method||Relining with short profiles|
|Client||Stadtentwässerung Dresden GmbH|
|Contractor||Arbeitsgemeinschaft Insituform Rohrsanierungstechniken GmbH, Dresden und Heinrich Lauber GmbH, Coswig|
|Advantages||Profiles made to fit original sewer, no disruption of tourism and traffic, the special profiles bear the full static loads with comparatively thin walls, top quality, delivery reliability|
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