Arona-Domodossola pass maintenance
Valico Arona/Domodossola
extraordinary maintenance of the railway crossing on the Arona-Domodossola/RFI S.p.A. line
RFI S.p.A.
Tunnels, Roads
Arona/Domodossola, Italia
-
120.000.000
Final project for the extraordinary maintenance of the railway crossing on the Arona-Domodossola line, aimed at adapting a series of works between Arona and Verbania to PC80/410 gauge.
The project mainly concerned a planimetric and altimetric optimization of the route with the aim of solving the interferences between the existing works of art (with particular reference to the tunnels) and the shape of the Minimum Obstacle Profile n° 3 (PMO3), compatible with the transit of Coded Transport PC80/410: this optimization of the route resulted in lowering and planimetric displacements of the railway level, structural works for the internal arrangement of the tunnels, punctual milling interventions with maximum thicknesses of 10-12 cm for the lining of the tunnels, interventions for the arrangement of rooms for shelters and sidewalks. The design involved a series of works (tunnels, railway overpasses, shelters and station platforms) including: the Arona Piccola, Arona, Faraggiana, Stresa, Scuderie Borromeo, Baveno, Feriolo tunnels. The stations of the section for which checks were carried out mainly on platforms and shelters are the stations of Arona, Meina, Lesa, Belgirate, Stresa, Baveno, Verbania.
The focus of the project
The focus of the project is the contour verification of the works (artefacts, stations, tunnels) present between the stations of Arona and Verbania. This verification also involved significant interventions on the track with lowering of the level by up to 50-60 cm, as well as planimetric shifts. The planimetric and altimetric optimization of the route was necessary as the intent of the project, in agreement with the client, was to intervene as little as possible on the existing structures with operations such as milling and niches: the tunnels above all, but also the overpasses and to a lesser extent the station structures, date back to the early 1900s and are made of masonry.
Structures
The existing masonry structures present particular problems both of a conservative nature and regulatory aspects that determine an insidious design process even for materials apparently in good condition. For these reasons, the project interventions favored the planimetric and altimetric modification of the route rather than the removal of parts of the tunnel lining (the extent of the gaps was limited to a maximum of 10 cm).
Description of Interventions
- A detailed analysis of the point clouds of all the stations from which the project sections were derived
- Design of the structural, but above all architectural, details of the final parts of the structures of the canopies
- Interventions for the arrangement of metal carpentry but also of downspouts and architectural decorations
- Removal of parts of the metal structure or the movement of downspouts
- For the sidewalks, on the other hand, mechanical milling of the parts interfering with the limit shape has been provided
- For the railway overpasses interfering with the line, shape checks were carried out using the outputs of a point cloud
