AN Atlas Copco HB 10000 ProCare hydraulic breaker is presently involved in the development of the railway line from Sandvika via Oslo City to the Gardemoen airport.
The double-track trunk line could no longer handle the increasing traffic volume to and from the new airport.
The expansion to four tracks required some 71,000 m3 of rock to be removed over a distance of 900 meters. Due to the extremely high costs involved in environmental and safety aspects and because of nearby residential buildings, blasting was out of the question.
Hegna Maskin from Notodden first used an Atlas Copco HB 7000, a 7-ton class hydraulic breaker.
The breaker is working from 7 am until 6 pm and is removing some 1,300 m3 of rock each week.
A tough and distantly jointed rock turns this into a very challenging job.
The entire project is scheduled to take 11 months and the contractors were looking for ways to increase the rock breaking capacity.