Factors affecting operation, maintenance and costs in subsea tunnels
In Norway we now have 32 Subsea road tunnels, and more are to be built in the coming years. Up to now operation and maintenance cost has been underestimated. Partly because there has been a relatively low standard in the road tunnels in Norway, but also because of the new regulations given among others from the EU. Another parameter is that operation and maintenance cost has not been sufficientlytaken into account when planning and building new tunnels. The choice of solutions based on the optimal life span for equipment will become more and more important for operation and maintenance. Subsea road tunnels have a characteristic of steep gradients when you drive in and out of the tunnels. And of course the water coming in to the tunnelshas to be pumped out. Aspecial program called PLANIA is used to take care of the planning of maintenance and also the documentation of the work we have done in the different tunnels.