Boyneburg Tunnel

On behalf of DEGES, the ZÜBLIN Tunnel Construction Directorate built an approximately 6 km long section of the BAB 44 between Kassel and Herleshausen and closes the gap in the federal highway network between the BAB 7 near Kassel and the BAB 4 near Wommen. The heart of this construction section is the 1.7 km long Boyneburg Tunnel.

The tunnel structure consists of two parallel tubes, each with two lanes and a width of 10.9 m. Each tube is 500 m apart. Breakdown bays are arranged at 500 m intervals in each tube, in which the cross-section was widened to 14.4 m wide. In the northern section of the tunnel, the entry and exit lanes of the Ringgau junction were also positioned in the widened cross-section of the tunnel over a length of around 200 meters.

ZÜBLIN constructed the highway tunnel using the shotcrete method by means of blasting and excavator driving. The excavated volume amounted to 400,000 m³. The inner shells, sealed with a plastic sealing membrane against the groundwater and stratum water, consist of reinforced concrete with thicknesses of 40 - 60 cm.

To the north and south of the tunnel, ZÜBLIN constructed two operations buildings, several engineering structures, the roadway and carriageway construction and carried out extensive special civil engineering work along a stretch of around 2 km each. In addition to the extended shell construction work, the contract also included the preparation of the implementation planning.

In addition to the ZÜBLIN Tunnel Construction Directorate (GU), ZÜBLIN Spezialtiefbau, the STRABAG Major Projects West Directorate and the Tunnel Sealing Division were significantly involved in the construction as internal subcontractors.