About the Škofije T8 Tunnel
It is the third longest twin-tube tunnel, 3808 metres long. The main and service tubes are connected by 7 crossbars. The technology for excavation in the clay bedrock was carried out mechanically with a tunnel excavator and hydraulic hammers, as well as by drilling and mining. In the area of low overburden in the valley of the Škofijski brook, it was necessary to carry out preliminary measures for the excavation above the main pipe, to remove the bad soil above the tunnel head and to construct a reinforced concrete separation cap
Length of the main tunnel tube
Length of tunnel service pipe
Work on the project
Excavation work
Tunnelling is construction work involving the excavation and removal of material necessary for the construction of a tunnel.
It is carried out in two phases: first the upper part of the tunnel (the calotte) is excavated, followed by the lower part of the tunnel (the step with the floor arch).
Progress of excavation works
Inner lining system
The completed internal lining gives the tunnel a distinctive shape, as it gives the underground space a uniform appearance and a smooth surface.
The construction of the inner lining system consists of: the floor vault, the foundations of the inner arch, the waterproofing of the tunnel, the longitudinal lateral drains and the inner arch, which is concreted with a movable tunnel formwork.
Progress of the inner lining in the main pipe
Progress of the inner lining in the service pipe
Other concrete works
In pre-construction, the term "other concreting works" usually covers all concreting activities that are not directly related to the main tunnel structures, such as primary and secondary arches. These works include: the execution of the fill concrete under the corridor, the kineta wall and the fill concrete above the floor vault.
Such works often also include adjustments to the concrete structures for the installation of technical systems and are essential to complete the tunnel in accordance with the technical and safety requirements
Progress of other concrete works in the main pipe
Progress of other concrete works in the service pipe
Tracks
A track on a rigid base:
Rigid track is a modern form of track that is used successfully all over the world, requires less maintenance compared to conventional shaft track, has a longer life expectancy and provides a more comfortable ride. The use of a rigid track system eliminates the possibility of track geometry errors during maintenance work. The possibility of direct attachment to structures, the lower structural height and weight compared to conventional track, make it the most optimal solution for tunnels and bridges. The expected service life of a track built on a rigid base is 50 to 60 years.
Track laying progress
Vehicle network
The tunnel catenary is a key component of the electrification of a railway line, enabling trains to be powered by electricity. After the track has been laid, the construction of the overhead contact line typically includes the following steps and elements: installation of the supporting structure, installation of electrical cables and wires, insulation and protection, and tensioning systems.
In tunnels, limited space and specific conditions (e.g. ventilation, humidity, vibration) require the use of specially adapted materials and construction solutions to ensure the durability and reliability of the overhead contact line.
Progress of the overhead contact line in the main pipe
Progress of the overhead contact line in the service pipe