Resurfacing on the B4 in Coburg

Since the 70s, the Bundesstrasse 4 has no longer run through the town of Coburg, but to the west of the town as a major traffic artery and bypass. Even back then, the highway was extended to motorway-like proportions: four-lanes wide and with junctions. Nowadays, 20,000 to 30,000 vehicles travel on the road every day, which has been severely affected and damaged by the traffic volumes. The contract for the much-needed resurfacing and restoration of the drainage system and the respective bridge structures on the B4 south of Coburg was awarded by the Bamberg public building authority to Rädlinger Straßen- und Tiefbau GmbH in Selbitz. Within nine months – by the end of September 2014 – the measures required had been completed, two months before the originally scheduled completion date.

This achievement should not be underestimated, given that the organisation and planning of the traffic situation constituted a great challenge for the execution of the work. Of the four connection points within the section to be restored, only one connection point was to be blocked at any one time. This resulted in some highly sophisticated coordination of traffic, in order to maintain safety. To keep the traffic flowing, the 2.9 km-long road section and one connecting ramp were therefore restored in eleven different sub-sections. In classifying these sub-sections, account had to be taken – and the timeframe integrated – of the renovation works being undertaken on the four existing bridge structures, so that the extensive renovation measures did not hinder the road layout.

Overall, the Rädlinger crews involved renewed almost 80,000 m² (22,000 t) of asphalt and approximately 12,000 m of verges, and restored large parts of the existing drainage system in small sub-sections. In addition, three new central reservation crossings, each of 200 m, and extensive paving work on the existing constructions and the drainage system had to be carried out at the same time. In terms of the surfacing, the team laid an 8-cm-thick binder course and a 4-cm-layer of stone mastic asphalt. Due to the composition of this particular top layer – a mixture of mixed stone, a high proportion of fine chippings, polymer bitumen and stabilising additives – particularly resistant road surfaces can be produced. This means that the renovated section of the B4 provides the best conditions for a long service life.

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