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Concrete design of the lining segments for the Follo Line Railway Tunnels

01/09/2020
  • The technology centre of the construction business of ACCIONA includes a group of professionals who are experts in concrete technologies, whose mission in the company is to develop short and medium-term technologies, as well as to provide advice and studies to projects and their works
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The technology centre of the construction business of ACCIONA includes a group of professionals who are experts in concrete technologies, whose mission in the company is to develop short and medium-term technologies, as well as to provide advice and studies to projects and their works.

Over the 15 years that this technology centre has been operational, it has worked on technologies such as the reuse of waste (construction and demolition waste, blast furnace slags, plastic waste such as polyurethane, etc.) or the use of low carbon footprint cements to reduce the environmental impact of concrete.It has also developed procedures and protocols for improving concretes in order to use them in extreme temperatures, in shotcrete, slip forming or fibre-reinforced concrete.Furthermore, the professionals at the technology centre of the construction business of ACCIONA have accumulated extensive experience in all types of special concretes, such as self-compacting concretes, lightweight concretes, ultra-high resistance concretes, high durability concretes, heavy concretes, cellular concretes, geopolymer concrete or concretes that are highly resistant at early ages.

In the area of operational advice, the technology centre has provided support to the company’s iconic projects such as the Cebú Bridge, the highway over Roskilde Fjord, the Dubai Metro, the Pajares and Chiquicamata tunnels, the Clean Energy Site C project, the Port of Açu, and the Follo Line railway tunnels.

The video describes one of the developments produced for the Follo Line works in Oslo, Norway.The Concretes Group, in collaboration with the Railways and Tunnels specialist business unit, designed the concrete for the tunnel’s lining segments.Firstly, a comparison of short fibres was carried out, both polymeric and steel, to satisfy the optimum residual resistance requirements for flexural strength.Secondly, following an in-depth study, it was proposed to replace the thermal curing tunnel of the lining segments with the use of latest-generation accelerant additives based on CSH gels.The curing tunnel for the lining segments usually reaches 50-60ºC and the lining segments are placed outdoors within a few hours, at temperatures of up to -10ºC.Consequently, the lining segments that are locked together on site can suffer from cracks due to the thermal shock and therefore suffer from durability problems or even structural complications in the short and medium-term.To minimise this risk, the technology centre of the construction business of ACCIONA proposed a solution that involved the use of these additives, which allowed the thermal curing temperature to be reduced to just 35ºC.

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