management of tunnels on the zagreb – macelj motorway ... - Index of

90availability. Tunnel equipment systems life cycle dependson various external factors impacting significantly onrealized life duration. Systematic approach with comprehensivemethods, monitoring and mitigation <strong>of</strong> such factorsare essential in reaching intended life cycle durationor even longer. Essential tools for reaching intended lifecycle duration <strong>of</strong> tunnel technical equipment is implementation<strong>of</strong> preventive and corrective maintenance aswell as monitoring <strong>of</strong> tunnel equipment systems errors. Inthe course <strong>of</strong> motorway operation <strong>tunnels</strong> with two-wayRud.-geol.-naft. zb., Vol. 25, 2012.Z. Deković, I. Pili: Management <strong>of</strong> <strong>tunnels</strong>...traffic (Sv. Tri Kralja and Brezovica Tunnels) are representingpotential higher risk places on the motorway thanother four <strong>tunnels</strong> that are constructed for full motorwaypr<strong>of</strong>ile. Therefore implementation results <strong>of</strong> preventiveand corrective maintenance <strong>of</strong> tunnel equipment systemsis analysed for these two <strong>tunnels</strong>. Figure 9 shows preventiveand corrective maintenance ratio <strong>of</strong> tunnel equipmentsystems from beginning <strong>of</strong> tunnel use in year 2007 untilyear 2011. Number <strong>of</strong> tunnel equipment systems failuresis shown in figure 10.Figure 9. Average ratio preventive and corrective maintenance per year <strong>of</strong> use Sv. Tri Kralja and Brezovica <strong>tunnels</strong>Slika 9. Prosječni odnos preventivnog i korektivnog održavanja po godini uporabe tunela Sv. Tri Kralja i BrezovicaFigure 10. Average number <strong>of</strong> equipment systems failures per year <strong>of</strong> use Sv. Tri Kralja and Brezovica <strong>tunnels</strong>Slika 10. Prosječni broj pogrešaka sustava opreme po godini uporabe tunela Sv. Tri Kralja i BrezovicaThe figures 9 and 10 make it clear that the number<strong>of</strong> equipment system failures were increased at the verybeginning <strong>of</strong> exploitation <strong>of</strong> the <strong>tunnels</strong>. Therefore theneed for interventions in the area <strong>of</strong> corrective maintenancewas also higher. Such a situation is expected, giventhe fact that certain initial optimization <strong>of</strong> the system, orthe “balancing” <strong>of</strong> individual systems, was necessary inthe initial period <strong>of</strong> system use. In the following years <strong>of</strong>exploitation <strong>of</strong> the <strong>tunnels</strong> it is visible trend <strong>of</strong> stabilization<strong>of</strong> the average number <strong>of</strong> system failures, as well as theaverage number <strong>of</strong> corrective maintenance interventionswhile efficiency <strong>of</strong> the preventive maintenance is increasing.3.1. Optimisation <strong>of</strong> tunnel equipment systemsparametersAll inspections and maintenance works with relatedmethods and techniques are managed and controlledtrough specialised Asset Management System. Based(Deković, 2011) on maintenance technical feedback abouttunnel equipment systems behaviour related per system