Semi-stationary welding for Utrecht's new Sneltram

By setting up mobile welding machines in semi-stationary operation, Vossloh has found an economical and logistically outstanding solution for its Dutch customer and its construction site partners.

A new rapid tramway for low-floor trams is currently under construction on the SUNIJ line between Utrecht and the outlying districts of Nieuwegein and IJsselstein. The rails sections were laid in June of 2020 and welded together to form continuous rails.

Tight curve radii are typical for tram lines and the new Sneltram line in Utrecht is no exception. In some places rails are being laid in curves of 120 meters. Technical specifications for using mobile welding machines, however, require the curves to be at least 300 meters. Vossloh therefore quickly decided to convert the customer's mobile welding concept into an economical and logistically superior solution: operating mobile welding machines as semi-stationary welding plants.

Excavators were used to convey Vignoles rails into the temporary welding stations that had been set up in the three depots. Here, the 30-meter lengths were welded into 120-meter lengths and then transported straight to the construction site on flatcars.

Timothy Ruiter, market segment manager for Track Supply, comments on the tight schedule: "We've scheduled our personnel to suit the customer's small time window. Despite Corona, by the end of the project we will have carried out nearly 1000 welds on this construction site." At one stage during the project, 60 welds were completed in less than nine hours.