Allershausen Construction Site Bridge in Germany
Facts and Figures:
Place/Country: Allershausen (Motorway A9), north of Munich, Germany
Completion: 2020
Project type: Panel (Bailey) Bridge, temporary construction site bridge
Client: thyssenkrupp Infrastructure GmbH Essen and Motorway Directorate of Southern Bavaria (end client)
Description:
Replacement of the overpass St 2054 across the motorway A9, km 499.734: In August 2019, Waagner-Biro secured a contract for the delivery of a temporary construction site bridge at Allershausen, Germany. Waagner-Biro delivered a temporary replacement bridge (Bailey-type) to be installed across the A9 motorway with two directional lanes during rehabilitation of the concrete motorway junction “Exit 67 – Allershausen / Hohenkammer” north of Munich. The construction site bridge was handed over to the client readily installed in January 2020.
Due to the heavy traffic on this section of motorway, the temporary bridge was designed to comply with Eurocode EN 1991-2 loading. A maximum deflection of L/800 and a minimum of 500000 load cycles were considered too.
Waagner-Biro supplied a double-lane (DW) panel steel bridge (Bailey type) with a single span of 60.96m (200 feet). A single storey structure made of three panel trusses on each side was launched across two inclined central piers and abutments. The bridge had a longitudinal and transverse slope.
Distribution beams beneath the centre of the bridge allowed a smooth load transfer into the central pier. Given the length and single storey design of the bridge, its centre had to be reinforced with high shear panels. The transoms were redesigned to fit with the installed restraint system.
The carriageway was a double-lane (double-wide) heavy-duty steel deck with a width of 7.0m. Crash barriers were installed on both sides of the roadway. An external walkway was attached to the outer truss, allowing maintenance work to be carried out. The decks were furnished with an anti-slip surface made of an epoxy and polyurethane resin coating.
The bridge was fitted with a complete drainage and crash barrier system by the construction company.
Waagner-Biro’s scope of supplies also included the delivery of a launching nose, rollers and hand tools for assembly of the bridge. The bridge was assembled and launched under the supervision of a Waagner-Biro expert in just a few days.
After completion of the rehabilitation works on the motorway junction, the temporary bridge was de-installed in August 2020.
