The Karlsruhe combined solution Karlsruhe

Project with depth

The “combined solution” is the name of a project for the further development of the Karlsruhe light rail network. KREBS+KIEFER was responsible for the site supervision for the subproject entitled “Kaiserstraße light rail network tunnel with Ettlinger Straße south diversion”. The technically very demanding inner city project made use of virtually all the well-established construction methods for foundations. One of the challenges was to enable the surface areas for the pedestrian precinct, light rail and vehicular traffic to continue to be used as much as possible.

Another important aspect was the stability of the adjacent residential and commercial buildings, for which the engineers were planning underpinning measures. The team also co-ordinated surveys, all issues concerning residents as well as health and safety work.


  • site supervision
  • co-ordination of residents
  • health and safety co-ordination
  • plan checking
  • survey co-ordination
  • contract and amendment management
  • implementation of the safety measures for the neighbouring constructions
  • * In partnership with ZERNA Ingenieure GmbH