High-voltage pylons to be demolished

After almost 50 years the old high-voltage pylons between Børdal and Mødal will be demolished and all traces removed. There will be a new power line on this section.

Croatian main contractor Dalekovod and Statnett SF have given the contracting company Henrik Steine AS the job of removing around 30 steel pylons across Kvamskogen forest.

Before the discarded steel pylons are assigned to the melting furnace, they are cut into smaller pieces and the concrete crushed to gravel by hydraulic hammers.

«The old pylon foundations will be completely removed. We even crush the concrete foundations and recycle the reinforcement steel. The aim is that by next spring nobody will be able to tell where the old pylons stood,” says Henrik Steine.

Falling steel

Although dimensions are large, the demolition method is quite simple. The first step involves climbing to the top of the pylon to fasten a cable to the cross arm. Then the nuts of four bolts in the tower attachment are loosened. 70 metres off is a digger ready to tug at the cable until gravity completes the job. Everyone involved in the pylon operation has received thorough training in climbing and lowering techniques.

The metal is sorted into suitable heaps and then transported by helicopter to the recycling station in Eikedalen valley. Each steel pylon weighs between 10 and 15 tonns.

Local labour

The main contractor’s use of local labour is considered an advantage.

“In our experience, using local businesses is a great advantage. Local knowledge is very useful. Moreover, it is positive that parts of the value creation remain in the local community,” says Construction Manager Lars Aga of Statnett.

According to Steine, both Statnett and Dalekovod stipulate detailed requirements for systems and documentation. The local contractor follows the rules and procedures established by Dalekovod. This means that the Croatian company is in charge of health, safety and the environment (HSE).