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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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Port construction,
Khalifa port

The Khalifa Port and Industrial Zone (KPIZ), one of the world’s largest greenfield development projects, is part of Abu Dhabi’s major diversification plan to develop various sectors such as property, tourism, infrastructure and others. Abu Dhabi’s main existing port, Mina Zayed, is hemmed in by Abu Dhabi city, limiting its accessibility and the possibility for expansion.

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Maintenance dredging, Berbice River

One of Guyana’s major export products is bauxite, which originates from the Aroaima, Kwakwani and Ituni regions around the Demerara and Berbice rivers in north-eastern Guyana. Guyana annually exports approximately 2.2 million tons of bauxite from it’s mines along the Berbice River. Boskalis International has long been associated with the mining industry in Guyana. In 1990 a long-term overburden removal project for the Aroaima mine was begun in Guyana involving the dredging and disposal of a sand and clay layer of 30-45 meters thickness.

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Coastal protection, St. Petersburg

St. Petersburg is a UNESCO World Heritage City, but its location along the River Neva means that it has been threatened by over 300 floods since its founding by Peter the Great in 1703. The completion of the new 25 km long storm-surge barrier across the Gulf of Finland ensures that the city will no longer be vulnerable to high tides and devastating floods. As a result of the new Flood Protection Barrier, however, the old winding access channel had to be replaced with a new, straighter, more easily navigable channel.

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Coastal protection, Delfland coast

In August 2008 Van Oord and Royal Boskalis Westminster N.V. have been awarded a contract by the Dutch Directorate General for Public Works and Water Management to reinforce a weak link in the Delflandse coast . The contract is worth EUR 120 million of which Van Oord and Boskalis have an equal share.

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Cleanup, Zellingwijk area

The Zellingwijk quarter of the village of Gouderak was built in the middle of the last century. In the early 1980s it became clear that the soil underneath this residential area was heavily contaminated as a result of the dumping of waste - mainly mineral oils and pesticides. The homes built on the site were subsequently demolished in the mid-1980s. Pending definitive remediation work, a layer of concrete / asphalt was applied to seal the site.

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Overview activities, Bahrain

The Kingdom of Bahrain is an island located in the Gulf, east of Saudi Arabia and north of Qatar and connected with its neighbour Saudi Arabia since the year 1980 with a 25 km long causeway. The archipelago consists of some 30 islands with a total of 160 km of shoreline and has a population of 800,000. Whereas the surface of Bahrain in the year 1960 was around 650 km2, the last decennia have seen a steady increase in the surface till a respectable figure of 740 km2 in 2007. This increase has been achieved by a various number of small and mayor reclamation projects.

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.