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Tunnels
and bridges

Boskalis designs, develops and constructs bridges and tunnels, providing solutions covering the entire process. For bridge construction over a river or estuary we first level the riverbed, install the bridge pillars or piers, and provide scour protection. Bridge parts can be installed by tandem lift. Underwater tunnel construction involves dredging the tunnel trench before laying the tunnel foundations. We also excavate construction sites for immersible tunnel elements that are then towed out and installed before backfilling the tunnel trench.

Top grade tunnel and bridge solutions

Designing, developing and constructing bridges and tunnels is technically complex and economically challenging. Boskalis provides design and environmental expertise. We employ innovative surveying and installation techniques and specialist materials.

We minimize risks and uncertainties to deliver the solutions you need.

Our track record speaks for itself. Over the past few decades, we have been involved in a large number of tunnel and bridge projects, including the Øresund immersed tunnel connecting Denmark with Sweden, and the Stralsund bridge in Germany.

Our tunnels and bridges solutions

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Leveling the riverbed

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Placing scour protection

Protecting the pile.

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Installation and ballasting pillar

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Installation of bridge parts by tandem lift

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Dredging the tunnel trench

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Laying the tunnel foundation

Laying the gravel or sand-flow foundation using the screeding technique.

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Locking fill, trench backfill and rock protection.

Placing the tunnel roof scour and anchor protection.

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Construction of building dock and water management

Immersable tunnel elements.

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Towing out and installation

Immersable tunnel elements.

Our projects

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Construction of
Marker Wadden

Boskalis has been awarded the first phase of the Marker Wadden development in the Netherlands. The project includes the construction of an island with underwater landscaping. The Marker Wadden are natural islands that will be developed in the Markermeer lake in the years to come. They will provide a major boost for the ecological quality of the Markermeer lake. The natural shores of the islands will give fish more opportunities to spawn and feed. As a result, large numbers of birds such as terns and waders will return to the area because there will be more food for them. The construction of the Marker Wadden will transform the map of the Netherlands.

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Outer harbor channel widening, Adelaide.

The Port of Adelaide is the primary port in South Australia, located at Outer Harbor. The port is operated by Flinders Ports Pty Ltd (Flinders Ports) and handles both container and cruise vessels, contributing significantly to the State’s economic activity. Flinders Ports identified the need for an upgrade of the existing infrastructure driven by the emergence of Post Panamax class vessels. To meet this growth the existing channel had to be widened to accommodate vessels with a maximum width of 49 m without operational restrictions. Flinders Ports contracted Boskalis to execute the dredging works.

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IJsseldelta

The IJsseldelta project is part of the national Room for the River program, which comprises over 30 measures aimed at upgrading the flood defenses in the Dutch river areas. The project involves lowering the summer bed of the Lower IJssel river along a length of 7.5 kilometers near the town of Kampen and creating a bypass to the south of Kampen.

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Construction of greenfield port and breakwater for Dangote quays Lekki

The Dangote Group, owned by Aliko Dangote, is building Africa’s largest oil refinery and fertilizer plant in Lekki, 60 kilometers east of Lagos, Nigeria. To facilitate the import of out-of-gauge components and other materials required for construction activities, a port was constructed

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Redevelopment Waterfront, Harderwijk

Boskalis Nederland is involved in one of the largest redevelopment projects in the Netherlands. The Harderwijk Waterfront project involves the complete transformation of the lakeside area of this IJsselmeer town. The project covers a strip approximately six kilometers long, combining homes, work and recreation in a natural way. The Harderwijk Waterfront will generate a quality boost in many areas: quality of life, employment, traffic, tourism and the environment.

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Artificial island
off the coast of
Jakarta, Indonesia

Boskalis has been awarded a contract by PT Muara Wisesa Samudra to design and construct an artificial island measuring 160 hectares off the coast of Jakarta, Indonesia. The work is part of the dredging and land development works for the new Pluit City. It will be executed in a joint venture with Van Oord.

More infra solutions

Land reclamation

Boskalis reclaimes land, improves soil, protects shorelines and realizes coastal contruction projects.

Coastal protection

Boskalis constructs traditional hard sea defenses and innovative soft sea defenses.

Environmental services

Boskalis provides a broad range of environmental services including remediation of contaminated land and dredged sediment.

Roads and railways

Boskalis develops, supervises and realizes multidisciplinary road and railway projects.

Inland ports and waterways

Boskalis designs, builds and maintains inland ports and waterways.