FEATURE NEWS:
New fibre optic system for safety and control while digging tunnels
Dätwyler Cables+Systems AG, Switzerland, has recently introduced a new fibre optic cable, Optofil ZGGT 1000 TBM, together with a specially developed and very compact self-winding system, designed for tunnel boring machines. This solution facilitates the transmission of control, alarm and signalling data between the tunnelling equipment and external construction site management. Dätwyler’s new fibre optic system has recently been employed for the construction of the new Gotthard base tunnel on the longest section (12km). Optofil ZGGT 1000 TBM is a special cable with a central tube construction for up to 12 optical fibres. Due to its torsion-relaxing properties and its associated good lying behaviour, it is particularly suitable for continuous self-winding from the tunnel boring machines. It provides reliable and non-disruptive transfer of large amounts of data over long distances during the whole construction period. In the Gotthard base tunnel, the Dätwyler solution is utilised for controlling the fire alarm unit, conveyor belt, air conditioning, ventilation, as well as the temperature, for rock pressure and video monitoring, for tunnel drive surveying and also as an external visualisation and data back-up.
Thanks to its good laying properties, Optofil ZGGT 1000 TBM can also be laid via cable pallets. It provides non-metallic rodent protection and is water-tight longitudinally. The materials used for the special cable are halogen-free and do not release corrosive gases in case of a fire. Dätwyler also developed a very compact winding system for the cable that allows for an uncoiling from the tunnel drive synchronously over part lengths of up to 1,650m. Dätwyler’s system provides rugged components and a very limited malfunction probability. The fibre optic connection is capable of functioning when the tunnel boring machine is operating 24 hours a day, 365 days a year. Quality controls and measuring on the spot ensure a non-disruptive and safe data transmission between the machine and external control centre.
This solution substantially eases operation for the site management. The possibility of controlling and monitoring major sections of the construction site externally via optical fibre saves those responsible a large number of lengthy trips. The activities at both tunnel drives can be constantly supervised by video cameras. Visualisation at the control centre enables technicians to react quickly and efficiently should incidents occur. The machine data can also be viewed and evaluated at any time outside the tunnel.
Photo: Optofil ZGGT 1000 TBM and a specially developed self-winding system for tunnel boring machines
Company: |
Dätwyler Cables+Systems AG |
Country: |
Switzerland |
Fax: |
+41 41 875 12 68 |
Email: |
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Website: |
www.daetwyler.net |