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All tunnels on the route of the second railway line broken through!

The main construction contractors have excavated the last metres of the service pipes of the Lokev (T1) and Beka (T2) tunnels. All 10 tunnel tubes on the Second track route have now been broken through and 37.4 km of tunnels have been excavated.

The Lokev and Beka tunnels are the longest tunnels on the Second track route, excavated in karst terrain and from both sides – the Divača and Koper sides. The service pipe of the Lokev tunnel (T1) is 6683 metres long, the breakthrough occurred 235 metres underground, and the service pipe of the Beka tunnel (T2) is 6041 metres long.

In the Lokev (T1) service pipe, approximately 5 metres of tunnel was excavated per day, the tunnel was excavated from two directions, so we are talking about 10 metres of tunnel per day. However, the service pipe of the Beka tunnel (T2) has recently encountered a major karst phenomenon, which has slowed down construction progress over the last month. Quite coincidentally, the site of the breakthrough now happens to be in a karst cave, which is also the longest karst cave that has been discovered, at 600 metres long. The karst cave is currently being rehabilitated.

The tunnels are now being used for the construction of the step, the floor arch, the waterproofing, the inner arch and other works, some of which were carried out at the same time as the excavation work.

All the tunnels on the Second track route were built using the New Austrian Tunnelling Method (NATM), a cyclic method characterised by the excavation of a length of tunnel at short intervals, depending on the geotechnical conditions, and the immediate post-excavation underpinning of the tunnels with support elements consisting mainly of shotcrete, anchors and support arches. The tunnels were excavated by Kolektor and Yapi Merkezi. The Slovenian construction company excavated the longest tunnel on the route, the Lokev tunnel (T1), and partly the last tunnel on the route, the Škofije tunnel (T8). Other excavation work was carried out by Turkish workers from Yapi Merkezi.

18. 6. 2024

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