Liebherr mixing plants for the most important infrastructure projects in Austria

Liebherr mixing plants for the most important infrastructure projects in Austria

Two Liebherr Betomix 3.0 mixing plants produce concrete for the Brenner Base Tunnel major project. This is one of the most important infrastructure projects for Austria and the European Union.

  • Considerable amounts of concrete
  • Large storage volume with a low space requirement
  • Individually adapted concrete mix for each rock section
Construction work on the Brenner Base Tunnel for a railway link between Austria and Italy has been underway since 2008. With a length of 64 km, it will be the longest underground railway link in the world. Construction should be completed by the end of 2027. One of the largest construction phases on the Austrian side is construction lot H51 “Pfons-Brenner”. Construction work began there in late autumn 2018. The contract was awarded to a consortium led by PORR Bau GmbH.

Constant high-quality concrete for the tunnel

The excavated tunnel tubes are secured with plastic and steel fibre reinforced shotcrete. The exact concrete mix is adapted to the condition of the rock in the tunnel, which changes over its entire length.

The concrete supply has to be well organised: Large quantities must be delivered reliably in perfect formulations with mixed-in fibres into the pipes. The long transport route must be taken into account here. When planning the mixing plant, large rock storage volumes, reliable concrete output, fibre addition and dosing, limited space for positioning and assembly of the plants and 24-hour operation – even in winter – had to be taken into account. Another important criterion was logistics. For this purpose, special railway tracks were laid for rail transport means for the concrete collection and for the material delivery of rock. The cement is delivered by truck in silo trains.

Porr chose two Liebherr-Betomix 3.0 plants for its concrete mixing plants. These come together with their two 3 m³ twin-shaft mixers to a maximum output of around 240 m³ compacted fresh concrete per hour. Thanks to the modular design of this plant concept, the Betomix plants could be optimally adapted to the local conditions. The large storage volume for aggregates with low space requirements was achieved by the new Liebherr high silos. Each of the two high silos can store 600 m³ of sand and gravel in seven chambers. Twelve binder silos, each with a capacity of 100 tonnes, supply the two plants with the required cement types. The fibre dosing systems are also part of the mixing plant, with the plastic and steel fibres being dosed separately, as the fibres have to be added in perfect doses during mixing and mixed in uniformly. For Porr, the decisive factors were the quality, the modular design and the short delivery time for Liebherr mixing plants.

source of: Liebherr

Nicole Portilla
Nicole Portilla
Nicolle Portilla is RTS’s Social Media Manager, and has been a valued member of the team since July 2018. She is responsible for content creation on all platforms, leveraging creative software, industry trends and research, and social media strategy to build upon the company’s online presence. Additionally, Nicolle contributes to the RTS blog, which serves to educate clients and industry players about our technology and sustainability efforts, and is responsible for the creation and dissemination of our internal and external newsletters. Prior to taking on the role of Social Media Manager, Nicolle served on the Sustainability team for nearly three years, assisting clients in achieving their sustainability goals through external communications and event organizing. Preceding Nicolle’s time on the RTS team is her work with Clean Water Action, where she promoted clean water initiatives. Nicolle graduated from Stony Brook University in 2018 with a B.A. in Sustainability.