Technical specifications

Scope of work

• single-track railway tunnel with a widened section allowing the railway line to be split into 2 tracks
• 14 trough blocks
• 13 tunnel blocks
• total length 353 m.

Construction method:

• open cut method
• section-by-section construction in 29 construction phases
• crossing of 9 railway tracks while maintaining railway operations, with auxiliary bridges being installed in the tracks for this purpose
•  Construction sequence of the tunnel blocks: base slab, concreting of the roof slab on a supporting structure 2.5m beneath its desired final position under the auxiliary bridges, lifting of the roof slabs into the desired final position using 6 jacks, concreting of the walls using a pump.

Geology:

• sand, gravel