Projects

AT92 Bruck

Hermann & Müller Power Station

The power station pipeline was originally made of reinforced concrete. During the first pressure test however there were problems with the pipe crown and haunches cracking. As leak tightness was not achieved, an alternative to concrete and a material that could meet the extremely high demands of a power station consequently had to be found.

Renowned for the high quality of their products, HOBAS were called in to advise the contractor. Following inspection of the project, relining was taken into consideration, but court proceedings and gathering evidence took so long that in the end it was decided to lay new HOBAS quality pipes. The need to exploit the spring water and the impending winter meant that time was of the essence.

The native soil was a stable gravel-sand mixture corresponding to ATV Group 1-2, but with a great deal of groundwater covering half the area. An excavator was used to lay and join HOBAS pressure pipes of 6 m length at a depth of 3.5 to 7 m. There was no need to line the trench and in places the existing concrete bed for the old pipes was used with gravel under the haunches and native soil backfill. The material was compacted in layers.

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Station.pdf