PROJEKT DESCRIPTION

The 8.7 km long Hallandsås tunnel is the core piece of the west-link railway in Sweden. Due to the varying geology and high groundwater pressure the construction of the tunnel is complicated. The tunnel is scheduled to open for traffic in 2015.

The current railway line over the Hallandsås ridge comprises a single-line track that was completed in 1885. Due to its climbs and tight bends, the section over the ridge has always been a problem. Hallandsås restricts capacity and creates delays along the entire west coast of Sweden.

In the 1980s, when the Swedish Government decided to expand and regenerate the Swedish rail network, the suggestion was also put forward for a tunnel to solve the problem of low traffic capacity on the stretch of track beyond Hallandsås. In 1991, the Swedish Government decided to construct an 8,7 km long tunnel between Båstad and Förslöv.
A tunnel through the Hallandsås ridge increases capacity from the current rate of 4 trains per hour to 24, and the goods trains weight capacity will be double.

PROJECT REQUIREMENTS AND SOLUTIONS

The tunnel is designed for a technical life time of 120 years, which put high requirements on the tunnel construction.
Sika has continuously been involved in technical discussions about waterproofing, injection, shotcrete, concrete, etc.

Waterproofing - membrane
Since the ridge has a high groundwater level the construction of the waterproofing is made with “watertight full-around seal” or holding the head of water. This means that the construction has no influence on the water table.
The TPO membrane (FPO, Flexible Polyolefin) system is installed on an inner-lining or on shotcrete with a surface evenness of 10:1 to provide adequate support. The system consists of geotextile fixed with discs which the membrane is welded to and divided into compartments to limit occurring leakages.

The size of the compartments (in square meter) depends on construction type and they are created with waterstops with integrated injection channels. In some parts protection sheet is installed as well to create a compartment and protection of the membrane. The system has been used in tunnel sections where there are no segments installed and with water leakages higher than the requirements.

Waterproofing - connection between segments and membrane in cross tunnels
Connection between membrane and segment has always been a challenge with flange construction in order to create a waterproofed connection. After investigation of reports, tests on-site and references the Sika joint tape sealing system was used to have a waterproofed system in the cross tunnels.

In the cross tunnels the joint tape (FPO, Flexible Polyolefin) was glued by epoxy adhesive directly on the backside of the segment. Afterwards, the waterproofing membrane was welded to the joint tape to create a waterproofed system. The joint tape has also been used to create compartments on the wet side of the cross tunnels. The system has been supplemented with swelling profiles/paste, injection hoses and by grouting to secure the waterproofing system.

 

Sika PRODUCTS

 

Waterproofing

  • Sikaplan WT 2200-32HL2
  • Sikaplan WT Protection sheet-25HE
  • Sikaplan Felt PP 1000-J B2
  • Sikaplan W Tundrain Type A
  • All kinds of membrane accessories
  • Sika Waterbar WT AF-600/34 MP
  • Sikaplan WT Tape 200
  • Sikadur-31 CF Normal
  • SikaSwell products
  • X-Plug (mechanical plug)

Grouting and Injection

  • Sika Injektering 30 (injection cement)
  • Sika iFlow-1 (dispersing admixture)
  • Sika iAcc-1 (accelerator)
  • Sika-SP40
  • Sika Intraplast-A
  • SikaFuko VT-1, VT-2 and Eco-1
  • Sikadur-52
  • Sika Injection-201 CE
  • Sika Injection-306
  • All kinds of injection accessories

Shotcrete

  • Sigunit-T&M

Concrete segments

  • Sikament 20 HE Åstorp
  • Sikament EVO 26
  • SikaAer-S

Mortars and other products

  • Sika FastFix-4
  • SikaQuick-506 FG
  • SikaMonoTop-910
  • Antisol-E
  • Sika-2
  • Sika AnchorFix-1
  • SikaTop-71
PROJECT PARTICIPANTS  
Owner The Swedish Transport Administration
Contractor
Skanska-Vinci HB
Applicator membrane/waterproofing Renesco a.s.