New ‘slip-form’ constructed firewall for the Herdersbrug converter site

During February some exceptional works have been undertaken on the Herdersbrug converter site.

The Austrian enterprise Gleitbau ( has been put in charge of the construction of a slip-form wall, which will serve as a fire wall between our transformers and the Converter Hall.

Slip forming, continuous poured, continuously formed, or slipform construction is a construction method in which concrete is poured into a continuously moving form. Slip forming is used for tall structures (such as bridges, towers, buildings, and dams), as well as horizontal structures, such as roadways.

The reason why BAM/Siemens have decided to use “slip-form” technology is that it provides a considerable time advantage. This technique has rarely been seen in Belgium, but allows delivering a high quality solution in a relatively short time frame.

The aim of the wall in question is to minimize the risk of fire in the Converter Hall. The wall is 0.5 m thick and 17m high; it has been built at a speed of approximately 3 m every 24 hours.

This represents a big step for the Herdersbrug construction works.