Naples subway

SERVICES: Survey with TSS (Tunnel Scanner System) equipment

CUSTOMER: Metropolitana di Napoli S.p.A

YEAR: 2019

On behalf of Società Metropolitana di Napoli S.p.A., a survey was carried out of the “Ponte della Bettina” tunnel on the Circumvesuviana line, CDN-Capodichino section, by means of Tunnel Scanner System technology.

The Tunnel Scanner System is an automatic survey system based on the simultaneous use of infrared rays and laser that makes it possible to obtain a complete photographic and thermographic image of the tunnel cable (facing, vault and platform) and to simultaneously acquire all the data necessary for the geometric survey of the cross-sections at any point of the tunnel.

The photographic image of the interior of the tunnel was taken at a resolution of 10,000 pixels/revolution, a resolution that made it possible to view every detail, both of the coating and of the installed services, with high detail.

The infrared thermographic survey was carried out at the same time as the visual and geometric survey, and as a result it was then possible to detect the defects on the coating due to washouts, water flows, etc.