The surface course of the federal motorway 30 between the Osnabrück-Süd motorway junction and the Hasbergen-Gaste junction was renovated over a total length of around 9.5 kilometres. The Osnabrück branch of PORR Verkehrswegebau was awarded the contract for the first, 1,800 metre-long construction section between the Osnabrück-Süd motorway junction and the Osnabrück-Nahne junction. Due to the extremely tight schedule, work was carried out continuously on two consecutive weekends from 7 p.m. on Friday evening until 5 a.m. on Monday morning.
Cavities in open-pored asphalt (OPA) absorb noise
On behalf of Autobahn GmbH, the team laid a total of 4,600 tonnes of whisper asphalt in the shortest possible time and to a high quality. After milling off the 4.5 cm thick surface course at night, the substrate was cleaned with high-pressure water jetting equipment before the bitumen emulsion for the layer bond was applied. The new OPA layer was laid seamlessly the following day across the entire width of the carriageway (12.50 to 16.25 metres) using two staggered asphalt pavers. Upstream feeders ensured a continuous supply of mix. The white film marking was applied to the still-warm surface directly behind the asphalt rollers, allowing the carriageways to be reopened to traffic on time on Monday morning.
High demands on planning and logistics
As disruption to road users was to be kept to a minimum, completing the asphalting work within the specified time frame was the top priority. Accordingly, the team responsible for scheduling and job preparation was challenged. On the one hand, sufficient personnel had to be provided for the 24-hour shift operation at the weekend, and on the other hand, the entire logistics had to be timed to the minute.
The necessary equipment had to be transported to and from the right place at the right time, the screed extensions on the asphalt pavers had to be set up and dismantled for paving widths of up to 8.5 metres and, last but not least, the asphalt transport had to be organised around the clock. To ensure smooth construction site traffic, the team drew up detailed overview plans showing the access and exit routes to the construction site and the work locations within the construction site. "Digital and mobile project management tools that enable us to react to changes in real time are indispensable for such tightly scheduled projects," explains project manager Julia Schweinsberg.
