A condition from the clients of the Municipality of Doetinchem and Rijkswaterstaat was that the fauna tunnels should continue to function for a long time, way into the future. The closed tunnels must be completely closed and laid under the road surface. Reptiles in the Netherlands are of small size and have limited maneuverability and climbing capacity. Reptiles also place very high demands on fauna provisions. In addition, consistent maintenance and management are of great importance for the proper functioning of fauna passages. The client wanted to ensure that the tunnel would be interesting during the day for reptiles, amphibians, hedgehogs, badgers, etc.
Because of the length of the tunnel, a decision was made to install 3 prefabricated 35 cm Solatube fauna daylight systems per tunnel. As the systems were completely prefabricated, installation on-site was easy; In addition, the systems are low in maintenance. Since the construction was completed, various investigations have been carried out to determine whether the fauna tunnels function as desired and the results show that the tunnels are used with great regularity.
Finally, 350 metres of 'wild-fencing grids' have been placed between the fauna tunnels, to ensure that the animals can find the entrance to the tunnel and do not cross the road.
How to provide daylight into a dense round fauna tunnel under the A28.
The solution was to construct a fauna tunnel and install two Ø 25 cm Solatube daylight systems to provide the necessary daylight.
How to provide Sustainable and safe lighting in the tunnel for pedestrians and cyclists.
The installation of two Ø 53 cm diameter Solatube systems, with double domes into the middle of the bicycle and pedestrian tunnel. A special custom finish ensures that both systems are vandal-resistant from below. In the evening and at night the light in the tunnel is supplemented with LED lighting.
The construction materials used had to be as environmentally friendly as possible, have a long service life and recyclable for reuse. To reduce the energy requirement, daylight was required within the parking garage, however the ability to be able to walk on the daylight systems was required due to the various platforms and gardens on top of the parking garage.
Various daylight tubes were used and fitted with a low profile Deplosun glass daylight collector which meant that the systems could be walked over. The Deplosun materials are provided with a Cradle to Cradle certificate and the daylight ensured that the required daylight points could be entered for the Breeam certificate.