A six-year construction project to connect roads on both sides of a river near the Port of Rotterdam has finally been opened to traffic.
The Blankenburg Connection (Blankenburgverbinding) now links Vlaardingen on one bank with Rozenburg on the other in a new traffic arrangement that will ease the congestion around Europe’s largest sea port.
The project, ordered by the?Rijkswaterstaat (Dutch Infrastructure and Water Management ministry),?saw the construction of a new motorway, the A24, to connect the A20 and A15 motorways, including?a tunnel under the River Scheur (described in detail in?Maritime Journal?here). The link road is also home to a new land tunnel called the Hollandtunnel.
One of the most challenging aspects of building the connection was the sub-river tunnel, the Maasdelta Tunnel, which was built in two sections and immersed.
Construction of the tunnel elements was carried out at the Damen Verolme shipyard at Botlek, whose giant 405m long, 90m wide drydock was just large enough to accommodate them.
The pits were flooded, becoming tidal to accept the sunken tunnel elements, which are?each 200m and 185m long, 42m wide and 8m high. sunk to a depth of 28m and leading to another complex junction at Rozenburg on the south side linking to the busy A15 motorway with connections to local communities.
A ‘letterbox’ structure connects the tunnels,which were sealed by bulkheads.
A steel profile of the same dimensions, called a Gina profile, created a water-tight seal between the tunnel element and access ramp, and Omega profiles formed the seams between the two tunnel elements themselves.
Despite a few technical failures and delays,?both tunnel elements were eventually towed into place by Boluda tugs?supported by a flotilla of workboats and other support vessels.?They were sunk to 28 metres by slowly flooding tanks within the tunnels themselves while counteracting tidal flow.
Tunnel elements of this size had never been built and sunk in the Netherlands before, at a depth of -30m NAP in a tidal river.
Infrastructure and Water Management Minister Barry Madlener?officially opened the new A24 motorway on December 7.
“With the opening of the A24/Blankenburg connection, we are really helping our country move forward,” he said. “We give road users more freedom of movement and the region more economic opportunities. As a member of parliament, I was involved in the decision-making process about this road and as a resident of the region, I know how important this connection is. Today I have the honour of opening this beautiful new highway. I am happy for the region and proud of the result.”
The project was sponsored by Rijkwaterstaat and the BAAK consortium (Ballast Nedam and DEME Group).
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1 个月Congrats!