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Den Oever guard lock

  • Location: DEN OEVER [NL]
  • Period: 2020 - ...
  • End of works
    December 2022
  • End of study - start of works
    October 2020
  • Start of study
    Beginning of 2020
  • Keersluis Den Oever  - aanvaarbeveiliging open toestand
    Copyright: Levvel
  • Keersluis Den Oever  - aanvaarbeveiliging gesloten toestand
    Copyright: Levvel

The new Den Oever guard lock closes at high tide and when storms are forecast to protect the hinterland with the existing, renovated Simon Stevin locks, among others, from rising water. This new lock is part of the complete renovation and reinforcement of Afsluitdijk, which is an iconic water barrier in the north of the Netherlands. The miter gates of this new guard lock will in turn be protected from collision with a ship by a type of floating barrier.

Rekenmodel stormvloedkering keersluis Den Oever

Miter gates

The miter gates are made of steel and are operated by a hydraulic cylinder. They are composed of two main lines connected by posts. Both lines have steel pressure seats to transfer the hydraulic load to the civil structure. Sealing is done through rubber profiles that strike against embedded steel plates. Each gate is also equipped with a leveling device that consists of a vertical rising sluice gate that allows regulation of the water level between the new storm surge barrier and the existing guard lock.

How does a miter gate work?

Miter gates consist of two steel gate wings that lean against each other at an angle during the water retention process. Owing to their operation as a three-hinged arch, they are efficient in material use. Each gate wing is equipped with two hinge points that allow the gates to be moved using a hydraulic cylinder.

  • Den Oever guard lock
    Installed miter gates
  • Écluse de garde Den Oever
    East door of the miter gates
The collision beam in retracted position

Collision protection

The collision protection is a separate structure that protects gates by means of a floating beam. When the miter gates close, this beam is pulled in front of the navigation channel on the Wadden Sea side. Combined with rubber fenders on the lock walls, the beam absorbs the kinetic energy of a ship in danger of hitting the gates.

The cross section, octagonal, was carefully selected. This strong and hollow section means that the beam can be locked by means of two toothed bars on the lock walls. The beam is therefore not pushed down during a collision

How does collision protection work?

During normal weather conditions, i.e. when the guard lock is open to navigation and the navigation locks are operational, the beam rests outside the navigation channel. At rest, the floating beam is held in place by tubular piles connected by a coupling beam. At low water levels, they also provide support to ensure that the beam does not collide with the embankment.

The beam slides through a pontoon on which the main mechanical components are installed. An electric motor drives a chain attached to the floating beam to move the beam into position in front of the lock if needed.

Installatie aanvaarbeveiliging - keersluis Den Oever
Copyright: Solidd Steel Structures

Responsibilities SBE

Development of the concept, preliminary design to implementation design of:

Miter gates

  • Steel structure of the miter gates
  • Sliders, pivot points, locks, pressure seats, etc.

Collision protection

  • Steel structure of the collision beam
  • Full motion work
Learn more about port, river & hydraulic engineering


  • The Afsluitdijk drone

    The Afsluitdijk

    Afsluitdijk, a 32-kilometer-long water barrier, has served as the physical barrier between Ijsselmeer and Wadden Sea for 90 years, which provides the Netherlands with flood protection. De Nieuwe Afsluitdijk prepares this water barrier for the future by raising and reinforcing it by utilizing innovations in energy, economy and ecology.
    View this project

Other sub projects

  • Installation of the roller shutter gate at Kornwerderzand lock

    Kornwerderzand guard lock

    The Kornwerderzand guard lock is a steel rolling gate that is designed to operate at high tide. The lock is part of the 32-km-long Afsluitdijk. This dike is currently undergoing a major renovation and reinforcement operation to continue to protect the Netherlands from rising sea levels.
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  • Walkway at Vlietermonument - The Afsluitdijk

    Walkway at Vlietermonument

    To restore the iconic Vlietermonument to its former glory, the walkway near it was demolished. The new walkway was built to the east of Vlietermonument.
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    Kornwerderzand and Breezanddijk traffic viaducts

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