BESIX Unitec renovates Waasland Tunnel in Antwerp, Belgium

On 8 September 2025, BESIX Unitec has commenced the long-overdue renovation of the Waasland Tunnel in Antwerp (Belgium), commissioned by the Flemish Agency for Roads and Traffic (AWV). First opened in 1933, this structure is Belgium's oldest road tunnel in Belgium and serves as a vital artery linking the centre of Antwerp to the city’s Ring Road.

New ventilation systems

The renovation focuses on the cross-ventilation system, which maintains continuous air circulation throughout the tunnel. The existing fans and valves are being replaced with modern exhaust and supply units, distributed across several shafts. A total of 42 exhaust valves will be incorporated into the new system, leading to better air quality and more efficient smoke extraction in case of an incident. This will, in turn, significantly boost safety levels.

To support the high capacity of this ventilation system, emergency generators are also being provided. In total, 20 fans will be installed, each weighing over three tonnes and delivering a capacity of 120m³/s per building, including standby units.

Fire detection, lighting and civil works

Alongside the ventilation upgrade, the fire detection system is also being renewed. BESIX Unitec is installing a cutting-edge setup featuring glass fibre cabling and advanced controllers that respond swiftly and precisely in the event of a fire. The system is directly linked to the ventilation network to ensure efficient smoke extraction.

The service buildings at both tunnel entrances are undergoing renovation too. Additional silencers and acoustic insulation are being installed to reduce noise generated by the ventilation system, helping to improve the quality of life for the neighbourhood.

Furthermore, new fire doors, hoist systems, staircases and lighting are being fitted (both in the buildings and in the technical roof of the tunnel). Asbestos is being safely removed, and the necessary civil works are being carried out to accommodate the new installations.

The renovation of the Waasland Tunnel is not only technically demanding, it also presents logistical challenges due to its urban setting and historic character. Thanks to the dedication of our teams and meticulous preparation, we are well on our way to future-proofing this crucial transport artery.

Wouter Happaerts

Project Director, BESIX Unitec

Smart technology and futureproof vision

All hardware components, including cabling and control cabinets, are being replaced and expanded with an advanced, integrated software control system that can be accessed both locally and remotely.

With just eight months of preparation and three months of execution, the project is being realised according to a tight planning.

With this renovation, BESIX Unitec is helping to shape the future of mobility in Antwerp. The upgraded Waasland Tunnel will not only be safer and more efficient, it will also play a key role in future traffic diversions, such as those planned during the premetro tunnel works in 2026.