Demolition of the existing structure (masonry arch bridge)
Construction of the new deck with prestressed beams using incremental launching
Deck span approximately 16 m
Deck width approximately 14 m
Temporary shoring with Berlin wall method: 500 m²
Piles: 550 m
Steel profiles: 50,000 kg
Installation of the deck by transverse launching
Deck installation works under temporary railway traffic interruption
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Underpass PK9.384
This project involved the reconstruction of the underpass at kilometer 9.384 (Mamer) on the Luxembourg–Kleinbettingen railway line. The existing masonry arch, dating from 1861, had a clear span of 4.80 m and a clearance height of 5.30 m, allowing the passage of C.R.102 road connecting Dippach to Mamer. Due to its advanced deterioration, it was demolished and replaced by a new structure.
The new underpass, fully compliant with Technical Interoperability Specifications (STI), allows the road to pass beneath the railway line with a clear span of approximately 12 m and a projected clearance height of about 7 m. The deck consists of steel beams encased in concrete. It was constructed above the road lanes and installed by transverse launching using hydraulic jacks, allowing vertical and horizontal movement. Temporary interruptions of road and rail traffic were required to minimize disruption for users.
Contracting authority Société Nationale des Chemins de Fer Luxembourgeois (CFL)
Etude 2018-2020
Construction 2020-2021
Key features
Our missions
Civil Engineering and Bridge Studies
Feasibility study
Preliminary design (summary)
Preliminary design (detailed)
Execution studies
Supervision, control, and monitoring of works