World’s Longest Tunnel Completed With Leister
For further information, contact:Award. It has been officially recognised as an “outstanding example of shifting freight transport to more environment friendly modes of transport.” Leister Technologies AG was chosen for this project not only because the Swiss company is the leading supplier of plastic welding solutions, enjoying an excellent international reputation; the geomembrane manufacturer also chose it based on the company’s more than 60 years of positive experience. More than 1,000 kilometres of high quality seam welding was done with Leister machines to complete the twin bore 57 km long tunnel. Leister TWINNY S automatic welding machines and hot air hand tools were used for this mammoth task. The compact combination wedge device of TWINNY S proved its merits once more even with overhead welding as the TWINNY S presses the two sheets together and thus rises easily and safely during welding. Despite its small dimensions, welding speeds of up to 6.5 ft per minute were possible with the TWINNY S. This was a crucial advantage considering the size of the project. The tightness is the most important criterion when evaluating the weld quality. To guarantee the greatest possible safety, a test channel was installed for each overlap weld. Regular peel tests to check the weld quality were carried out directly in the tunnel using the EXAMO test device from Leister, a device highly suitable for construction sites. Not only is the processing and the material crucial, but also the machinery used. “We work exclusively with Leister devices and depend on their reliability. They correspond exactly to our requirements. We have been working with Leister equipment for as long as I can remember”, said Mr. Urs Streuli, project manager of the material supplier who was in-charge of this project. With a planned service life of over 100 years, only the best quality of material, processing and machine enables fault-free and hence efficient work. Leister proved once more that its products withstand all the demands placed on them, even when they are extreme.
Mr. Sumesh S, Marketing Manager
Leister Technologies India Pvt Ltd
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