Why did the salmon cross the road

When Atlantic salmon head upriver to spawn, they fill Norway’s magnificent rushing waterways with some of the finest fishing stocks in the world. Here’s how Trelleborg is helping to preserve this anglers’ paradise in the face of transport development in the area.

Thousands of foreign visitors come to fish for salmon in Norway every year, creating significant employment opportunities for the local population throughout the vast coastal landscapes. And since tourism is such an important industry here, the authorities take any potential risk to the business very seriously. One such risk lies in modern society’s demand for fast, efficient transportation systems, which has led to the development of new roads that threaten to cut off the traditional salmon fishing areas, and jeopardize not only the angling opportunities but also the fragile life of the fish.

When the Norwegian Public Roads Administration planned a new motorway near Trondheim, they encountered multiple challenges; such as the many rivers carrying salmon, and the fluctuating water levels due to the open connection to the sea. Blocking the rivers was not an option; that would have put an end to any fishing trips to the area. Besides that, any proposed solution to redirecting the rivers would need to accommodate very large volumes of water.

Pipe manufacturer Loe Rørprodukter was up for the challenge. And so, with the help of Trelleborg Industrial Solutions, they designed a large pipe and sealing system that would divert five streams: a network measuring a total of 595 meters. Loe Rørprodukter then bought molds for the wet casting of three-meter diameter concrete pipes, and asked Trelleborg to produce a specific kind of seal for them. In total, 350 pipes — each 1.75 meters long — were produced, and Trelleborg supplied the seals, which were integrated into the pipes during their manufacture. Lars Loe, Managing Director of Loe Rørprodukter, says: “We had worked with Trelleborg on previous projects and knew they could produce high quality, tailor-made seals that are suitable for even the most complex environments.”


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