It then serves as a basis for further inspection at regular intervals or as a trigger for additional inspections and measurements. Afterwards, the data is integrated into a digital database (Fig.1) – partly it still remains available only on paper. Often basic knowledge about the severity of certain damages and their development is missing.ĭuring these walkthrough inspections notes and photographs are taken and data in general is collected. Experienced but sometimes not specially trained and educated staff carry out these walkthroughs, which may also include some detailed visual inspections. This allows to focus on certain features and areas that need special attention. (visual) walkthrough inspections based on the available input data. Currently tunnel inspections are carried out mainly by Accordingly, the total amount of tunnels that must be inspected will increase in the future. Every year 4700 km of new tunnels are built, resulting in an annual growth value of 7 %.
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