Construction of the new Büchler bridge in Luxembourg
The transport infrastructure project new national road N3 covers several districts of the capital city of Luxembourg and includes the replacement of the Büchler bridge, running over all twelve railroad tracks south of the main station, which is necessary in this context. The new bridge design is characterized by a significantly widened traffic cross‐section that carries a total of six lanes for road traffic and a new double‐track tram line, in addition to wider sidewalks and bike lanes. The traffic is supported by an undivided girder grid, whose three main girders in the form of steel sails pierce the carriageway slab above the inclined intermediate supports. The design of the new bridge is characterized by the small possible construction height below the roadway level, which resulted from the maintained longitudinal profile of the N3 in the construction area and the increased clearance height of 0.85 m for rail traffic under the bridge. The present report describes the challenging planning and the demanding construction work at the same location under full traffic.