Renovation of the Nederrijn and Lek weir ensemble
Commissioned by Rijkswaterstaat, SealteQ is working with Solidd Steel Structures as a subcontractor for Siemens on the large-scale renovation of the Nederrijn and Lek weir ensemble. The weir ensemble consists of three weir complexes in the Nederrijn and Lek. SealteQ is responsible for preserving the huge visors of the weir ensemble.
The Nederrijn and Lek weir ensemble consists of three weir complexes: Driel, Amerongen and Hagestein. With the weir complex in Driel, Rijkswaterstaat distributes river water across the Nederrijn and Lek and IJssel. In this way, sufficient water flows to the IJsselmeer, the largest freshwater basin in the Netherlands. The three weir complexes ensure that the water level is sufficiently high for smooth and safe navigation on the rivers. With the Nederrijn and Lek weir ensemble, Rijkswaterstaat is contributing to a liveable and accessible Netherlands. The weir ensemble has been renovated since 2015. By replacing technical installations, movement works and the introduction of central control, the weir complexes can continue to perform their important tasks safely and reliably in the future.
Six visor weirs
In total, six visor weirs will be replaced, the last one being planned for next year. Each visor weir consists of four parts. This is because the surface of one visor consists of 4000 m² with a weight of 270,000 kg. The replacement of the northern weir of the Hagestein complex is a special replacement. In 2015, the weir was given the status of national monument. That is why the weir has been replaced by the renovated weir that was removed from the Amerongen complex in 2017.
The five other visor weir were designed by Solidd Steel Structures. A complex process since it requires extreme precision in accuracy. Subsequently, the parts were blasted by SealteQ to a cleanliness of Sa 2½ and preserved with a three-layer coating system. After this, the visors were shipped to the weir complexes. Once arrived, the visor parts were hoisted and assembled into the construction by Hebo Maritiemservice
Every year, around 39,000 ships pass through the locks at Driel, Amerongen and Hagestein. During the replacement of the weirs the complexes were completely closed. As a result of the renovation, shipping traffic made use of the adjacent locks. These locks are also open for shipping in times of high water levels.