Fiberglas for a protected hydropowerplant

The company Aarsleff has performed a rather special assignment for Hartevaerket. The old pipes og the plant were corroded and filled with holes. The solution were to install a polyestertube reinforced with fiberglas inside the pipe of 80 meters. This was done in 2010.

The downpipe is a riveted pipe of steel, which was corroded and filled with holes over time. These holes were usually sealed with wooden sticks. As the time went bye, the wooden sticks were replaced with a bolt with gasket, or a patch was welded on. However, this solutionn wasnøt sustainable in the long run which led to the involvement of the companies Rorteknik and Bolig og Industri.

As the starry skyrøret

The pipe was thoroughly cleaned and during that process, approximately 500 new holes were made visible. It was suggested that a fiberglasspipe were to be mounted inside the existing pipe in order to create a corrode-free pipe, which could keep the water pressure at 2,5 bar.

The suggestion was accepted nd spproved by the national board of cultural heritage, because we chose to preserve the original pipe. The board even chose to support the project by coverng 20% of the investment.

Divided into sections


The pipe has a falling height of approximately 26 m, it h

35 sections dividedas a length of 80 m and has a diameter of 1,75 m. The new pipe is made of fiberglass with sand inside the core. The pipe is divided into sections, where each section is 2,3 m long aand has a diameter of 1,6 m. For every fourth section, the space between the fiberglasspipe and the steelpipe is closed with concrete to limit the buoyancy and pressure, when they had to cast after, between the pipes.

Installing 35 sections

After having installed the 35 sections of pipe, both ends were laminated with polyester  reinforced with fiberglas. The pipe was put together again, and the condrete were pumped inside between the sections. The project took four weeks in total.

New Foundations


Park were also involved kin the project and were head of all escavation work and creating new foundations. 

The terrain of the plant and the pipe made the work extremely troublesome. They mounted 11 new foundations to secure the pipe.

Cultural Heritage

Hartevaerket was build during 1918-1920 to insure the nearby land electricity, during the crisis of energy throughout the first world war. 

During its prime time the plant delivered halft of the electricity used in Kolding. Today, the plant is owned by a foundation and due to the cultural heritage of the plant, it has been marked protected. Today, the plant is a museum and an experimentarium and periodically delivering electricity to the ciry.