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Huiswaarderbrug, Alkmaar

Huiswaarderbrug, Alkmaar

TruSteel Infra

A bridge built to last for decades to come

The Huiswaarderbrug in Alkmaar is an important crossing over the Noordhollandsch Kanaal. Built in 1974, this 120-metre-long bascule bridge uses a mechanical drive system to open and close the bridge deck. After more than fifty years of service, the original operating mechanism had reached the end of its service life. A complete replacement ensures that the bridge is ready for the decades ahead.

A technically complex replacement

Replacing the operating mechanism presented several technical challenges. The new installation had to fit within the limited space of the existing machine room, while stricter requirements meant that the new system had to be considerably heavier than the original. By opting for two smaller electric motors instead of one large motor with a gearbox, the new drive system fits within the available space. The weight of the operating mechanism has increased from approximately 8 tonnes to more than 43 tonnes. To safely accommodate this additional load, the concrete foundation was reinforced.

The weight of the operating mechanism has increased from approximately 8 tonnes to more than 43 tonnes.

The operating mechanism

TruSteel Infra is responsible for manufacturing and installing various structural components that together form the foundation of the bridge's renewed drive system. These include the drive frames supporting the braking systems, manual operating mechanisms, electric motors and gearboxes. In addition, TruSteel Infra is delivering the crank arm, including a heavy counterweight, and the connecting rod with spring buffer. These components form part of the mechanism that converts the movement of the drive system into the controlled opening and closing of the bridge deck.

Precision is essential throughout the project. All components must align accurately with the existing bridge structure and the renewed drive system. By carefully manufacturing the structural components at our production facility in Emmen, we contribute to the reliable integration of modern technology into existing infrastructure.

Ready for the future

The collaboration between client Stadswerk072, Technisch Adviesbureau Sliedrecht (TAS), TruSteel Infra and the other parties involved made it possible to modernise the existing bridge without having to replace it entirely.

With its renewed operating mechanism, the Huiswaarderbrug now features a modern drive system designed to operate reliably for decades to come. The system includes new electric motors, gearboxes, brakes and manual operating facilities. Emergency operation has also been taken into account, allowing the bridge to be operated manually in the event of a power failure.