inform 11.2011 e (pdf file 2 MB) - Duktus

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PAGE 4 | INFORM NO. 3 / 2011 WKG pipes for maintaining the temperature of drinking water USED TWICE IN ThE CONSTRUCTION Of ThE NESSELGRUND BRIDGE TO ThE SOUTh Of POTSDAm Connection and pulling-in of the WKG pipes During the construction of the new Nesselgrund bridge in the federal state of Brandenburg, Duktus WKG pipes are being used to carry the drinking water in the bridge pipelines. Between Michendorf and Potsdam, the capital of the state of Brandenburg, federal highway B2 crosses a multi-track Federal German Railways railway line by the Nesselgrund bridge. The bridge was about 60 years old, and was no longer equal to the present-day volume of traffic, or to the higher stresses caused by increased vehicle weights, nor were the facilities for carrying services state of the art. A new bridge had to be built. Brandenburg’s State Highways Authority has invested 2.7 million Euros in building the bridge and the construction work began in February 2011. The access road to Potsdam carries a lot of traffic and to keep this road open, a two-lane temporary steel bridge 80 metres long has been built. This bridge has also had to take all the facilities for carrying services. Duktus sales manager Lutz Rau explains the situation: “In the course of this construction operation, an existing DN 300 drinking water pipeline needed to be relocated temporarily and will need to be re-installed once the new bridge has been completed. During the construction phase, a tubular steel structure 550 millimetres in diameter suspended from the interim bridge is holding the pipeline. The planners opted for Duktus heat-compensating cast iron pipes (WKG) with BLS®/VRS®-T joints and with fully galvanized folded spiral-seam outer tubing. This enables any possibility of the water pipeline freezing to be ruled out even if the water remains stationary for a protracted period, as it would for example in the event of a possible breakdown, or even if there is an extreme frost. The flexible positive-locking BLS®/VRS®-T restrained joints also compensate safely for different temperature-related differences in length between the pipeline and the structure of the bridge and rule out any threats not only to safe operation but also to the German Railways line crossing below the bridge.” It was not only price and availability that were crucial to the placing of the order but also the extensive extra technical work that Duktus does. Employees of Duktus’s Applications Engineering Division at Wetzlar were even involved in the initial discussions on construction. All the com- The pipes laid were Duktus DN 300 heat-compensating ductile iron pipes (WKG) with BLS®/VRS®-T-restrained joints panies involved in the operation took part in these discussions, including Energie und Wasser Potsdam GmbH (EWP) which is responsible for the drinking water supply. Georgios Moutroupidis took charge of the on-site instruction of the laying personnel belonging to the Berger Bau company, and Lutz Rau assisted the team with the fitting of the traction head loaned by Duktus by providing the appropriate laying tools. As expected, the actual connection of the easy to handle BLS®/ VRS®-T restrained joints and the pulling-in by steel cable of the connected pipes fitted with skids for sliding went off without any problems, so the 84 metre long bridge pipeline was quickly installed. After the pressure test and passing the hygiene inspection, the section of pipeline was connected to the old pipeline by prefabricated angle connections. The interim pipeline will be supplying the population to the south of Potsdam with their hygienically clean water until May 2012. The new Nesselgrund bridge will then have been completed and a new drinking water pipeline will take over from the interim one. Duktus will also be supplying the pipes for that. Duktus applications engineer Georgios Moutroupidis giving instruction on laying The two-lane temporary bridge approx. 80 metres long allows through traffic to continue during the construction work
INFORM NO. 3 / 2011 | PAGE 5 Culvert pipeline under the river Traun near Linz A LOOK AT hOW WELL ThE DUKTUS PIPE SySTEm PERfORmS The 92 metre long culvert pipeline of Duktus ZMU pipes being installed in the river Traun Being used for special or difficult applications is nothing new for Duktus pipes. When a pipeline for transporting water was laid from Linz to Ansfelden, the ductile iron pipe system once again attracted attention because there were many challenges which had to be overcome in a relatively short distance of (only) 1.4 kilometres. Duktus was able to show how well its ductile iron pipe system performs. This year, there has hardly been any water management project in Upper Austria which has made such severe demands on the underground installation engineers and on the material of the pipes as the laying of this pipeline for transporting water. Not only did a culvert pipeline 92 metres long have to be run under the river Traun, but crossings by pipe bridge were also needed over the river Krems, the Mühlkanal and the Mühlbach and over a canal serving a power station. LINZ AG, the city-owned supply company, did all the planning and laying work. Duktus DN 400 pressure pipes with BLS®/VRS®-T joints and A concrete casing was needed to stop the pipeline from floating up a Pur Top coating were used for this work, which lasted from 6 February to mid-April 2011. The successful commissioning of the water-transporting pipeline, which supplies the area served by the Wasserverband Großraum Ansfelden utility and the southern part of Linz, took place in June of this year. What made the project necessary was a bridge pipeline (700 metres of steel pipes and 700 metres of asbestos-cement ones), laid in 1960 when the part of the A7 autobahn in Linz was built, which had become unserviceable. Renovation would have cost 350,000 Euros more, so LINZ AG opted for a buried pipeline. The new route runs along the A7 towards Ansfelden. The planning made allowance for the prospective widening of the A7 to three lanes. But that was not all the planners had to cope with; there were also many stipulations made by the authorities to be complied with. In the words of Wilhelm Riedlbauer, operations manager of LINZ AG WATER, who saw to the planning and implementation of the special project: “The major part of the pipeline is situated in the Natura 2000 nature reserve. For this sensitive area there were special legal stipulations relating to nature and fishing which had to be allowed for. But there were also water rights to be observed, not to mention consents to be obtained for ground clearance and stipulations by Asfinag, the Austrian motorways operator, and by the electricity supplier VERBUND.” The major challenge from the laying point of view was the 92 metre long crossing of the Traun by a culvert pipeline following a curve measuring 80 metres in radius. The crossing was made without using a pre-drained trench. Excavators dug a trench two metres deep in the river, and the pipeline, which was encased in concrete, was pulled in by a cable winch able to exert a tractive load of 80 tonnes. As Duktus sales manager Ingo Krieg is well aware, the concrete casing was insisted on by the authorities to stop the 76 tonne weight of the pipeline from floating up, given the high speed of flow of the Traun. Because the Duktus ZMU pipes were mounted on a sledge of steel plate, the tractive forces acted on the sledge and not on the culvert pipeline. At the time of installation, an ascending end section was pulled in as well to stop any river water from getting into the pipeline. Two drivers kept watch on the pulling-in. When the other, smaller, waterways were crossed, a heavy crane lifted the Duktus pipes, which had been pre-connected in a steel supporting cradle, into the water. For these sections of the pipeline, special GDR fittings (plain-ended pipes) – supplied by Duktus in Hall as specials – were used. Pressure tests were carried out before and after the pulling-in and lifting-in work done in the respective cases. “Here on the Traun we were able to watch a demanding piece of laying which went off without any problems, due not least to the professionalism of the companies involved – GLS Bau und Montage GmbH of Perg, Hitthaller of Linz and LINZ AG itself – but also to the reliability of the BLS®/VRS®-T joint and to the ruggedness of the ZMU pipes”, is how Ingo Krieg sums things up. Working under floodlights When the smaller waterways were crossed, the sections of pipeline – fitted into a cradle of steel plates – were lowered into place by heavy cranes
Page 1 and 2: Volume 7 No. 3 November 2011 Potsda
Page 3: Editorial Dear readers and friends
Page 7 and 8: get the work finished on time. Layi
Page 9 and 10: INFORM NO. 3 / 2011 | PAGE 9 flexib
Page 11 and 12: Satisfied customers in Tampere PART
Page 13 and 14: Rega rescues and piles protect SWIS
Page 15 and 16: The machining of fittings starts at
Page 17 and 18: INFORM NO. 3 / 2011 | PAGE 17 Day o
Page 19 and 20: Success on the track DUKTUS TEAmS G

inform 11.2011 e (pdf file 2 MB) - Duktus

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