In the spring of 2020, Aarsleff Pipe Technologies carried out one of the largest and most complex pipeline renewal projects ever carried out with flexible linings in Sweden. The project was carried out on behalf of the municipal water and waste company Nodra AB.
Norrköping’s largest sewer pipeline was near collapse, the starting point was more or less acute with investigations carried out in 2015 showing that Norrköping’s largest sewage pipeline was in danger of collapsing in five to seven years. It was an unusually large and hard-to-reach pipeline, located 3 to 4 m below the asphalt surface, in a very centrally paved tree alley lined with 1,800 building-protected trees.
The solution proved to be group strength and tailor-made solutions. Thanks to borrowed group expertise, Aarsleff was able to solve the project and in total a pipeline section of as
much as 3 km was renovated. Meanwhile, all the wastewater in the city was pumped down to the treatment plant through temporary pipes, which was the largest bypass of its kind to be done in Sweden. Several types of flexible linings and installation techniques were used in the project, including installation with water, steam, UV and well renovation, all of which were carried out to ensure optimal operation of the new pipe.
The results offered a time-saving, cost-effective and sustainable future investment and streets and squares that did not need to be dug up and furthermore carbon dioxide emissions could therefore be kept down. Nodra was able to save valuable resources and
minimised disruption to residents, traffic and businesses in the area. The project has made it possible for the wastewater to be fed to the treatment plant in a safe and reliable way before it is discharged into Bråviken, making this an important investment for Norrköping to function and grow sustainably.
“When it was time for procurement, it was difficult to get tenders due to the complex
nature of the assignment. Aarsleff was the only one that could shoulder the challenge.
Magnus Ålstam, water and wastewater engineer at Nodra said: “I do not think anyone could have imagined what attention the project would get in the media. Both Norrköping’s newspapers and Folkbladet raised the project on large spreads on a number of occasions.
“Radio, industry media and private individuals in social media have also shown great interest in following this project. Now that this stage is coming to an end, it feels like ‘what happened, didn’t the job take longer?! I am very pleased with the cooperation with Aarsleff.” said Jonas Törnvall, project manager for Nodra.
