RAILWAY ACCESS TO THE NORTH AND NORTH-WEST OF SPAIN

CLIENT: GIF
Segovia (Spain)

This involved a section 6.7 km long in a straight alignment in plan for almost its entire length. In elevation there are two alignments with slight gradients forming a convex shape near its first fifth part .
The section starts with a cutting with a maximum height of 10m which leads to the Tabladillo tunnel, 2,514 m long, built as a mined tunnel of 1,113m using the NMA, the support varying in seven sections according to the ground.
The rest of the section is built as two cut and cover tunnels with a cross section of 100 m3 on the southern and northern sides, 697 and 704m, respectively. These were built on footings and invert with a pointed arch structure with three radii (4.5, 8 and 12m respectively) of great slimness and a maximum height above the ground level of 9.52m. The vault was built with HA-25 concrete with a thickness varying from 80 cm at the starts to 50 cm at the key.
The alignment ends with a succession of sections in cuttings and embankments.
The project included the repositioning of six tracks and a local road over the cut and cover tunnel, two precast overpasses (initially designed as semi-integral and integral structures) and six culverts.