Installation of a cable crane for the safe transfer of the bomb

Due to the high safety requirements, our key task was to install a specialised cable crane for the safe transfer of the bomb from the location next to the residential house to a protected pit for controlled disposal. The system enabled the controlled transport of the explosive device without additional risk to people, infrastructure or the surrounding area. The cable crane was thoroughly tested beforehand, and the entire transfer scenario was simulated.

The project required careful planning, technical coordination and execution in cooperation with the National Unit for Unexploded Ordnance Disposal (UXO), civil protection, the police and other emergency response units. Due to the danger involved, a wider area within a one-kilometre radius was also evacuated.

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Transport using material ropeways

We were involved in transporting construction materials using material ropeways, which were essential for the construction of the new ski jumping hills – the so-called junior and youth ski jumping hills – as well as for the renovation of the Hugo funicular railway.

At one stage, as many as four material ropeways were operating simultaneously at the construction site, with lifting capacities ranging from 500 to 3,000 kg. The longest ropeway was 700 metres long, while two material ropeways operated continuously throughout the construction period.

Installation works for the new two-seater chairlift

As part of the project, a new two-seater chairlift was constructed to provide easier access for ski jumpers and ski flyers to the top of the inrun. We carried out all installation works at the lower, middle and upper stations, installed the support towers and assembled the continuous haul rope from which the seats are suspended.

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The route of the Spodnja Idrija – Godovič state road from km 4.872 to km 7.959 is cut into a steep slope between the Zala River and the slopes of Zagodov, Govekarjev, and Jelični vrh. The slope is covered by forest with old, unstable trees that pose a threat to the road, while an even greater danger is represented by rock blocks and overhanging slopes.

In the past, protective measures had already been implemented along the roadside slopes in Zala, significantly reducing the frequency of falling rocks. However, rocks were still falling on three sections, which were protected this year with high-tensile mesh and flexible rockfall protection barriers.

Extensive logging, drilling works, and helicopter installation of flexible rockfall protection barriers

Over the past eight months, extensive logging and tree removal, drilling works, installation of flexible rockfall protection barriers, and covering of slopes and hazardous rock blocks with mesh have been carried out in Zala. Using a mountaineering drilling rig, we drilled approximately 5 km of boreholes.

Together with a team of trained rope access technicians and our subcontractor, we installed 28 flexible rockfall protection barriers with a total length of 2,253 m and more than 6,500 m² of high-tensile mesh. Where mobile cranes could not be used due to the steep terrain and difficult logistics, the installation of the systems was supported by the Austrian company Heli Austria and the Slovenian company Flycom Aviation, which provided helicopter assistance.

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The foundations of the 20 kV RP Idrija – Oblakov Vrh power line are located in the immediate vicinity of residential buildings in Idrija. While access for our spider excavator was not an issue, we had to find an alternative solution for transporting concrete and larger construction materials.

Under normal circumstances, we would install a temporary cable crane system in such conditions, but this was not an option in this case. The environmental impact would simply have been too great. Transporting the material along an alternative route would also have risked reducing the quality of the concrete due to the prolonged transport time from the concrete plant to the construction site.

The only way to ensure fast, high-quality restoration of the foundations within the planned timeframe was by using a helicopter. It transported larger construction materials and fresh concrete from the loading area below the Kobalove Planine plateau to the foundations above Vojkarska Street in Idrija.

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The cable crane operates as needed throughout the restoration period, depending on the daily requirements on site. Although it is not in constant operation, it plays a key role in transporting several tons of material without additional intervention in the natural environment.

Technically, it is a classic solution: smaller-diameter carrying and hauling steel cables enable the transport of loads up to 300 kg at a time. Instead of modern industrial transport trolleys, we chose a proven and locally recognizable solution — the traditional pulley trolley known in forestry as the “Idrija trolley.”

The restoration works are being carried out by VELB d.o.o., a construction company from Cerkno, on behalf of the Parish of Idrija. The project combines respect for cultural heritage, technical expertise, and adaptation to the natural environment.

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