Composites in a very large gate

Canal lock gates are, in many ways, nearly ideal for the application of composites, benefitting tremendously from the material's durability, light weight, high strength and corrosion resistance. So, it was no surprise when, earlier this year, highly innovative composite lock gates were installed in the Wilhelmina Canal in Tilburg (The Netherlands) under direction of Heijmans. These huge lock gates (6.2m by 12.9m) were manufactured by FiberCore Europe (Rotterdam, The Netherlands) with resins from Aliancys AG (Schauffhausen, Switzerland). The installation was relatively easy, because of the low weight of the parts in comparison with steel and wood. The composite solution was chosen for its extended lifetime expectancy (more than 80 years), durability in continued contact with water and minimal maintenance.

The Wilhelmina Canal is an important water way in The Netherlands, and a vital part of the transportation infrastructure. In order to keep up with the increasing water traffic and increasing size of the ships (up to Class IV), the Wilhelmina Canal is being widened and deepened near the city of Tilburg. The project has been commissioned by the Dutch water way authorities (Rijkswaterstaat), and is executed by a combination of construction companies Heijmans and Boskalis. Installation of the lock gates was done by the construction company Hillebrand.

After project completion, the large vessels should be able to sail through this section much faster. This means less heavy traffic on the roads, reduced road congestion and consequently reduced emissions of CO₂ and particulates. The improvements to the canal will also create additional economic opportunities as businesses are increasingly using the canal network for delivery of products.

As part of the larger project, the existing locks II and III are replaced by a single new lock. Also, new sheet piling is installed along the canal sides and a more environmentally banks are being developed.

The composite parts were designed, engineered and manufactured by FiberCore Europe with Synolite 1967-G-9 resin from Aliancys, using InfraCore Inside technology. The large doors have a relatively low weight (24 MT), which is significantly less than comparable solutions in steel and wood (respectively 50% and 25% less). This makes the installation much easier, requiring simpler equipment and upfront preparation. Because the fact that the specific gravity of the door material is fairly close to that of water, wear and tear on pivoting points is greatly reduced.

“Lock gates in composite materials are highly competitive in terms of cost compared to traditional material solutions based on steel and wood,” explains Harald de Graaf, CEO of FiberCore Europe. “Steel and wood gates require repainting or treatment on a regular basis and for that purpose need to be removed from the lock (with an interrupted operation of the lock as a result). In many cases, wooden gates need to be replaced with new ones because the water will ultimately penetrate in the material and reduce mechanical properties.”