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South exit
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North exit
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Steel braces in the south shaft |
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Pillar tunnel |
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Lateral excavation |
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Final shape of the rock chamber
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Ground water system
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The Triangeln area
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A new station in Malmö city
Triangeln station will be important for the people of Skåne as well as long-term visitors and not least for the 23,000 inhabitants in the area. The station will become very important for the everyday lives of those who live and work in Malmö. The music theatre, concert hall, cinemas, sport centres, shops, department stores and shopping centre will be within walking distance. Furthermore, there are more than 18,000 jobs within the close vicinity of the station. These include one of Skåne’s largest employers – the University Hospital, UMAS.
Strategically located exits
The station is strategically located. The north exit at S:t Johannes church leads directly out towards the Triangeln shopping centre and the south section to Malmö’s commercial centre. The exit to the south leads towards the Faculty of Odontology, Södervärn, the University Hospital UMAS and Möllevången. When Citytunneln is complete it is expected that 37,000 people will pass through Triangeln station daily.
Rock chamber station
The station is built as an underground rock chamber station with two tracks and an intermediate platform. The actual rock chamber at approximately 25 metres below ground level will be 28 metres wide and 12 metres high. The platform with its two tracks will be 250 metres long and 14.5 metres wide. The station hall is bounded by a ceiling approximately 5 metres above the platform. The two exits are located at each end of the rock chamber where there will also be escalators and lifts.
This is how Triangeln is constructed
To build Triangeln station, two vertical shafts have been excavated in the north and south sections of the work area. The shaft walls need to be reinforced before the work on excavating the rock chamber can start. This is why concrete beams are cast along the shaft walls. Heavy-duty steel pipes, referred to as braces, are installed between the concrete beams to keep the shaft walls apart. A total of 30 braces will be installed in the two shafts.
The excavation work from the open, vertical shaft starts by cutting a centre tunnel in two stages, one top heading and one stope. The tunnel is strengthened successively with bolts, steel arches and reinforced spray concrete. The permanent reinforcement is made when the centre tunnel is complete and comprises the foundation, pillar row and ceiling beam in the middle.
To break out the lateral tunnels in suitable stages, the lower section of the centre tunnel is filled temporarily with extracted limestone rock to the same level that the top heading in the lateral tunnels will have.
The two lateral tunnels are then cut and successively reinforced. When the lateral tunnels have been reinforced, their lower section (stope) is excavated and the temporary filling is successively removed in the pillar tunnel. It is then time for both the tunnel boring machines to pass Triangeln’s rock chamber.
Concrete castings are then made for the station’s final shape, platforms, constructions for escalators and lifts. Finally the tracks and railway technical equipment are installed.
Ground water
The water level needs to be lowered completely during the construction period. This is done through a number of extraction wells. The water is pumped up from the rock nearest the construction shaft. The water is then pumped back into the rock some distance away with the help of infiltration wells. In this way the area for ground water lowering is limited.
Traffic disruption
Traffic and residents in the neighbourhood will be inconvenienced during the construction of Triangeln station. Therefore, great consideration will be taken to those living nearby and to local schools.
The interests of people travelling by public transport, cyclists and motorists will be considered in the planning of the construction process.
In those cases where streets are closed for long periods, the traffic will be diverted.