Reportage in Bergsäkert 2023#2
Shaft reinforcement in a tight urban environment
In a cramped area between Bergshamra and Mörby, under the two large bridges for E18, Danderydsvägen, and the commuter train, Bergteamet is performing shaft reinforcement. The work is part of the large power supply project City Link.
The project involves reinforcing two new shafts that have been raise-bored by Master Drilling in the Danderyd area in northern Stockholm. The shafts are four meters in diameter and 55 and 70 meters deep, respectively.
“We are reinforcing the shafts with shotcrete and bolts,” says Bergteamet’s Site Manager Jens Jonsson.
Long Cable Tunnel
The shafts will be used for both ventilation and power supply and connect to a new 16-kilometer-long underground tunnel driven by a tunnel boring machine (TBM). The purpose of the tunnel is to lead a power supply cable between Anneberg and Skanstull.
“The shaft reinforcement is carried out by six of our miners who usually work in the mine in Kiruna but whom we rotate into this infrastructure project in Stockholm,” Jens explains.
The equipment used by Bergteamet consists of a fixed hanging platform with a motor-driven winch and a concrete spraying platform.
More Shafts May Follow
The end customer is Svenska Kraftnät, and Bergteamet’s client is MasterDrilling.
“These are the first two of a total of four similar shafts being made in the project, and we hope to be trusted to perform the reinforcement for the upcoming shafts as well,” says Jens.
Three of Bergteamet’s employees on site. From left: Hugo Hetta, Björn Marklund, and William Eriksson.
FACTS ABOUT CITY LINK
An important part of the Stockholms Ström project is the new power connection City Link, which is being built in four stages. Anneberg-Skanstull constitutes the second stage. City Link will connect the northern and southern Stockholm areas, from Hagby in Upplands Väsby to Ekudden in Haninge. When City Link is completed, electricity can be fed from several directions to the Stockholm area, securing power deliveries for the future.
Reportage in Bergsäkert 2023#2