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Production stoppages cost tens of millions of Swedish crowns per day. Such disruptions must quite simply not be allowed to happen. The vibrations from the piling activities during the major construction project at BillerudKorsnäs have been carefully monitored to ensure that they do not cause disruptions.
Board is a growth area within the paper industry. While the demand for newspaper is in decline, board is becoming increasingly popular, not least for the production of packaging for food and beverages.
It is thus an investment for the future that is being made when BillerudKorsnäs invests in a new board machine at its Gruvön facility in Grums, to the west of Karlstad. In time the new machine will replace four of the existing machines at Gruvön.
“The investment amounts to SEK 5.7 billion in total, which also includes rebuilds in the existing pulp mill and expanded facilities for water, steam, warehousing and transportation”, explains Bjarne Andersson, construction coordinator at BillerudKorsnäs.
“The piling activities simply must not be allowed to disrupt our ongoing production” Bjarne Andersson, construction coordinator at BillerudKorsnäs
The area rests largely on clay. Consequently, in order for the new buildings to have a stable base on which to stand, a significant amount of piling work has been required.
“We have driven in 9,000 piles. At the same time the nearby production processes have continued as normal. The rollers in the paper mill are sensitive to vibrations. If they start to run unevenly we end up with quality issues. In the worst of cases we would be forced to stop the production process completely, which costs tens of millions of Swedish crowns per day, plus costs for repairs. Such disruptions must quite simply not be allowed to happen”, says Bjarne Andersson.
BillerudKorsnäs has engaged the services of Nitro Consult to ensure that the vibrations are kept in check.
“We have carried out a risk analysis for piling and certain blasting activities at various locations within the area. The risk assessment concerns above all else the amount of shaking that can be tolerated in nearby buildings. Damage to equipment and facilities must be avoided, and we have set the vibration limits that have been acceptable in this case”, explains Mats Nyhlén of Nitro Consult.
“We carried out ongoing vibration monitoring during the work. This was done remotely via our NCVIB web portal, which we used to monitor the various activities. The measured values came from 42 measurement points. We have also carried out inspections of the buildings before and after the disruptive activities.”
A separate assignment has been to ensure, via 19 measurement points, that the vibrations have not affected the hardening of concrete that has been cast on the site.
“The risk analysis has been revised a number of times in relation to new sub-projects at this large workplace. It is a gigantic construction project”, says Mats Nyhlén in summary.
The new board machine will be 450 metres long, with an annual capacity of 550,000 tonnes of board. This makes it one of the largest machines of its type in the world. The machine will produce liquid packaging board, cartonboard, food service board and liner. Production is expected to start during the first quarter of 2019.
More about this project
New board machine
January 2017 - December 2017
We did: Risk analysis, inspections and vibration monitoring for piling and blasting activities