Construction: 06/2003 - 07/2003

Renovation of Inn Canal – Jettenbach / Töging

Work on steep embankments:

Renovation of the Inn Canal – Jettenbach / Töging

The Inn Canal at Jettenbach-Töging forms the headrace channel of the Töging power station. Its total length from the Jettenbach intake channel to the power station is approximately 20 km.

The poor structural condition of the embankments was the reason for renovating the structure.

Job Report – Factsheet

  • Project: Inn Canal renovation
  • Contractor: EON Wasserkraft GmbH
  • Client: ARGE renovation Inn Canal
  • Type of operation: Repair of fire damage in the undersea tunnel
  • Special feature: Substrate preparation on steep embankments
  • Equipment technology: Special construction
  • Unit: 450 kW units

The job

570,000 m² of embankment had to be prepared within 6 weeks for the subsequent works. The embankments have a consistent gradient of 40°.

The start of the canal is 8 m high, and this gradually increased to 12 m at the end. This creates embankments of between 12 and almost 20 m that must be bridged.

Custom design

Due to the narrow time constraints, the Wannenwetsch design team developed a multi-nozzle blasting jet, which, in combination with high-performance telescopic caterpillars, meant the large and steep embankments could be completed within the desired framework conditions.
The construction site traffic in the invert area, the high level of residual water and the very steep entrance and exit ramps made the project particularly challenging.

Substrate preparation

Owing to comprehensive trials and preliminary works, as well as the dedication of our employees, the project progressed swiftly and reliably. Once the damaged concrete had been removed using modern high-pressure water technology, the subsections were repaired with shotcrete and then provided with a new, all-over concrete panel.


Using special robots powered up to 450 kW by pump units, Wannenwetsch was able to complete the preparatory works before the interim and final deadlines, even despite difficult conditions.

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