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EURO RAIL EXPERTISE


of stream train soot embedded within it!


• Establish reliable and complete data for our work.


• Establish a complete and accurate sur- vey of conditions.


• Ensure flexible logistics and reliable ma- terial transport (and storage) ensuring that the shift requirement is accounted for before start of work.


• Ensure procedures are developed with rail-bound vehicles that are available for a wide range of activities and that we maintain the programme with minimum machinery idling time.


• Decoupled work activities that can be cut short (or extended) if required.


• Maintain a well-trained and experienced core of staff and managers.


Case Study – Alberg Tunnel


The two-track Alberg tunnel is located be- tween St Anton and Langen in Austria. It’s the main trunk line connecting western Austria with Vienna and has a total length of 10.6km.


Constructed between 1879 and 1884, its RK SAFETEC GmbH


For several years now, Rhomberg Rail has provided solutions for railway construction projects, working with an expert partner, K.E.M Montage GmbH. RK Safetec GmbH designs, installs and operates, safety and security systems for tunnels and other major construction sites, like mining and heavy industry.


In order to meet the demands of the market, both partners set up a joint company and offer their services not only to the railway industry, but also to all types of major construction sites, like energy & construction and marine & logistics. Currently, RK Safetec concentrates on its core home markets in Austria, Germany and Switzerland, but the medium-term intention is to acquire projects all over the world.


One of the products that RK Safetec installs is ZOKA system. ZOKA is a German acronym for access control, locating position, communication and alarm. The ZOKA system is a comprehensive system and the most suitable all-in-one safety and control system for big projects.


The individual ID cards with RFID tags


let the ZOKA system determine exact locations. In the event of an emergency, the tags provide information regarding the exact location, to guide rescue crews straight to the emergency scene.


The central monitoring station controls the access of people, vehicles and machines.


The construction area is divided into various positioning zones to provide real- time detailed information on all movement. Moreover,


with high-resolution video


surveillance every movement is easily monitored and can be recorded at the same time.


Site communications play a key role in the management and co-ordination of construction sites. Special telephones are distributed across the area, to ensure an optimal, reliable and functional network at all times.


Several different systems are also used for mobile communication and connected to the central control centre. In order to have a high level redundancy, all systems are networked and connected to control centre with a fibre optic network.


walls are made from broken stonework with a thickness between 0.5m and 2.0m. In 1978, a parallel road tunnel was dug. Due to several tragic accidents, the rail tunnel was connected to the road tunnel at several locations to allow emergency access and evacuation.


Our scope of works was:


• Widening of the tunnel profile in 6 places; • Replacing the tunnel inner shell surface, which involved removing 60,000m2


of


existing gunite layers and replacing with 40,000m2


of shotcrete;


• Widening the tunnel for greater clear- ance;


• Dismantling and removal of 27,000m3 ballast and 12,000m3


of bedding;


• Installation of 18,500m of slab track, with drainage (including eight switches);


• Construction of spring mass systems with a total length of 1,500m.


• Install a 10,000m long water supply line; • The whole of the rail tunnel to be made the usable for emergency road vehicles;


• Installation of drainage; • Cleaning the entire tunnel surface.


of Chosen solution


Rhomberg Bahntechnik and our partners designed a working train based on conven- tional wagons, able to be split to work in different places at the same time.


Connected wagons have a common energy and air supply and are fitted with walls to separate the work areas from the adjacent track. A high-pressure water jet was used for cleaning the tunnels, which also pro- duced a rough surface for the new shotcrete layer. This layer included a fleece, covered by 2cm of shotcrete, and then an installed plastic layer before a further layer of 3cm of shotcrete. Widening of between 12cm to 15cm was then undertaken by an adapted wagon fitted with a wheel saw. The saw made numerous cuts to prepare for the remaining stones to be removed with chip- ping hammers. Rhomberg’s special track removal machine was used from the adja- cent track to remove the track in panels, and was followed by a conveyor system to remove the ballast.


Summary


The retrofitting of old rail infrastructure and tracks is one of the biggest challenges in rail engineering today. Wherever rail transport on existing lines cannot be inter- rupted by construction works, innovative concepts allowing safe construction in close proximity to working tracks are required. Rhomberg and its partners have success- fully addressed this with the development of practice-oriented solutions based on long-term experiences, gained over many years and many kilometres of working in the testing environment of the Austrian tunnels.


FOR MORE INFORMATION Ian Knowles, general manager Rhomberg Rail UK E: Ian.knowles@Rhombergrail.com


rail technology magazine Jun/Jul 11 | 53


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