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Glatscheras Tunnel - refurbishing works

Glatscherastunnel Tunnelinstandsetzung

Glatscheras Tunnel - refurbishing works

Client:

Rhätische Bahn AG
Location: Switzerland
Project time: 08/2014 - 12/2016
Executing companies: Rhomberg Bahntechnik, Sersa Group AG (consortium with Berther Bau and Industrie AG)
Contract value: 10,50 Mio. CH

 

The 330 m long "Glatscheras Tunnel" is only one of many more tunnels on the Swiss narrow-gauge railway line between Chur and St. Moritz. It is approx. 110 years old and mostly lined with locally sourced stone masonry.

This tunnel is the very first of many more tunnels to come to be refurbished in a specifically designed "standardised methodology", developed by the local rail operator "Rhätische Bahn".

The project involves the lowering of the tunnel floor in conjunction with increasing of the tunnel profile to allow for the installation of pre-fabricated tunnel lining elements. These elements were delivered to side by use of railway wagons and installed using some bespoke manipulator to allow for a safe and fast installation process. Tunneling works were executed using both mechanical excavation as well as drill-and-blast technology.

To minimise any impact to regular train operation all of the works had to be executed in overnight possessions between 21:00 an 06:00. Therefore, specifically designed protection lining which included the overhead wiring needed to be put in place to allow safe train running operation during daytime.

To allow for conventional tunneling machines to operate in the tunnel some purpose-designed temporary slab track was installed anlong the complete tunnel length.