The ITA COSUF TSO Webinar on Refurbishments of Road Tunnels (18 November 2021) organised by Activity Group 4 (Tunnels Safety Officers) supported by the Dutch Knowledge Centre for Underground Construction and Inderground Space (COB) was visited by 72 attendees mainly from Europe and few from India and New Sealand. This webinar was ment as a teaser for the bi annual TSO Forum in 2022, where the main topic will be tunnel refurbishment. This TSO6 will be organised on June 9 and 10th 2022 in Bruxelles. After a brief introduction by ITA COSUF Chairman Max Wietek the main programme started with a presentation by Silvester Heijdemann (Rijkswaterstaat) and Harry de Haan (Rijkswaterstaat) of the renovation of the Heinenoordtunnel in the Netherlands. Besides renewals of equipment, a new safety concept with a central escape gallery is created and during construction one tube is in operation most of the time which is a challenge.  A second presentation was provided by Program Director Richard Bormans of Arcadis who is assigned by the Flamish Road Authority to carry out the preparations for the total and integral renovation of the Vierarmentunnel in the Brussels ring road and of the Beverentunnel in the Antwerp ring road. In this assignment BIM models, tunnel safety documentation and renovation files are supplied for both the TERN and non-TERN road tunnels. 

Both presentations showed that to prepare a road tunnel renovation one should not only focus on a safe final situation, but also on the construction phase where part of the tunnel is in operation.

The presentations can be downloaded here.

Refurbishment of Heinenoordtunnel by Silverster Heijdemann and Harry de Haan 

Renovation of Road Tunnels - A Flanders Example by Richard Bormans




Presentations and full report can be downloaded from here


On the 14-15 November the ITA-COSUF Internal Workshop in Innsbruck took place. This workshop was organised by the ILF Consulting Engineers, ASFINAG and AQUASYS, which was appreciated by the 30 participants. The workshop started with the General Assembly 2019 on day 1. On day 2 we met at ILF and enjoyed the lectures on the global work of ILF, the refurbishment project of the Arlbergtunnel, applications of water mist systems in Austrian road tunnels and Education, training and exercise as part of tunnel safety in Austria. Part of the event was a site visit to the 15 km long bi-directional Arlberg tunnel which is provided with a watermist system and a special evacuation concept from the bore to the fresh air duct of the transverse ventilation system. Also the massive assembly areas for the evacuees while waiting for the emergency services (see picture below) were impressive. It was a fruitful meeting with good networking opportunities and exchange of information with other experts in the field of operational safety of underground facilities. The presentations of the Workshop can be downloaded here.


The ITA COSUF Webinar on Tunnel Safety (29 April 2021) organised by Activity Group 4 (Tunnels Safety Officers) in collaboration with the Dutch Knowledge Centre for Underground Construction and Inderground Space (COB) was visited by over 200 attendees from all over the world. After a special word of introduction by ITA COSUF Chairman Max Wietek the main programme started by a visionary talk of TSO Andre Stein on tunnels in the 21th century with all future changes in mobility. Andre expressed his view on the self-rescue concept of future road tunnels in an age of disruption. Then the new Köhlbrand crossing in Hamburg was covered in a presentation by Olaf Thiemann (Hamburg Port Authority) and Frank Embert Kreiser with a bicycle tunnel as a special topic. And last but not least the COB paper on cyber security was presented by Jasper Kimstra and Johannes Braams of COB. They went into the details when the paper will be useful during the lifecycle of a tunnel. After the webinar the 22nd meeting of the ITA-COSUF Activity Group 4 was held.

The presentations can be downloaded here.

ITA COSUF Max Wietek: Special word of introduction.

1. Andre Stein: Tunnels in the 21th century – the next level.

2. Olaf Thiemann en Frank Ember Kreiser: The new Köhlbrand crossing, a new tunnel for Hamburg!

Fire test bicycle in tunnelDelft 1/2021

3. Jasper Kimstra and Johannes Braams: Tunnels and Cyber Security








The technical session on Operational Safety of Underground Transportation Facilities on the 7th of May as part of the World Tunneling Congress 2019 in Naples was well-attended. The audience consisted of many ITA COSUF members and other delegates from the WTC 2019. In his opening word, ITA COSUF Chairman Max Wietek underlined that New Energy Carriers in combination with underground transportation facilities will lead to new operational safety risks and there is a need of new knowledge on how these new risks should be assessed and controlled. Some topics that were covered during te workshop were IT systems, monitoring, the refurbishment challenge that is facing Europe and various presentations on ventilation in rail and metro tunnels. The presentations can be downloaded here.


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