Special solution with Fischer FHB dynamic
Malmö City Tunnel, Sweden
A new city tunnel is being built in Malmö, Sweden’s third largest city. A special design of the fischer Highbond anchor FHB dynamic is used for fixing the brackets for the railing in the maintenance and service walkways.
The new 9.2 kilometre City Tunnel in Malmö links the continental rail track coming from the Öresund bridge with Malmö’s main station and the Scandinavian rail network. The Öresund link between Sweden and Denmark, a combination of bridge and tunnel construction, was opened for traffic in July 2000. It connects the cities of Copenhagen and Malmö via road and rail. The new city tunnel will make the rail connection faster.
The two tubes running parallel have an internal diameter of 7.9 metres. They have a total of 13 cross and evacuation tunnels spaced at 300 and 400 metres, with two shafts leading vertically up. Next to the underground station in the immediate neighbourhood of the central station, the Triangeln and Hyllie stations are also under construction, one below ground in the inner city, the other above ground on the outskirts. The award for planning and completing the entire construction lot (E201) went to the Malmö Citytunnel Group (MCG) under Bilfinger Berger AG from Germany as main contractors.
The tunnel section for the Hyllie station is made in open-cast construction. The twin-cell square cross section has a clearance width on both sides of 21 metres and a clearance height between 7.20 and 9.85 metres. fischer supplied 22,000 FHB dyn 12 × 100/15 C, 1,150 cartridges FIS HB 345 S, almost 9,000 threaded rods RG M10 × 130 C, 5,800threaded rods FIS A M10 × 100 C as well as over 14,000 additional nuts M10 C. All the anchor rods, washers and nuts are made of highly corrosion-resistant steel (1.4529).
The Fischer Highbond anchor FHB dyn 12 × 100 / 15 C used in the construction is a special version, developed specifically for the Malmö City Tunnel by Technical Sales Support with development support from Denzlingen. The anchor is accompanied by special installation instructions which also describe the re-assembly which will be necessary in about 40 years. After that time, the brackets must be renewed. The brackets held by the Highbond anchor Fischer FHB dyn are fixed to the concrete tunnel tubbings via footplates. They carry a fire pipeline and cable routes. Due to the train traffic, the bracket fixings had to be designed for dynamic loads.
Somewhat less demanding were the requirements and specifications for fixing the hand rails and earthing rails along the service and maintenance walkways and for fixing the earthing rail in the tunnel roof. The threaded rods Fischer FIS A and RG M were used, with an extra counter nut added to the usual nut and washer to prevent the fixing from working loose through train vibrations.