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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

Tunnels and bridges
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Placing scour protection

Protecting the pile.

Tunnels and bridges
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Installation and ballasting pillar

Tunnels and bridges
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Installation of bridge parts by tandem lift

Tunnels and bridges
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Dredging the tunnel trench

Boskalis_Immersed_Tunnels.pdf
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Laying the tunnel foundation

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

Boskalis_Immersed_Tunnels.pdf
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Locking fill, trench backfill and rock protection.

Placing the tunnel roof scour and anchor protection.

Boskalis_Immersed_Tunnels.pdf
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Construction of building dock and water management

Immersable tunnel elements.

Boskalis_Immersed_Tunnels.pdf
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Towing out and installation

Immersable tunnel elements.

Boskalis_Immersed_Tunnels.pdf

Our projects

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Land reclamation and revetments works, Salam Yiti

Salam Yiti is located near the south of Muscat, about 40 minutes away from Muscat’s international airport, and minutes from the traditional business and hotel district of Qurum. The Salam Yiti development covers 420 hectares of land and climbs as high as 140 meters above sea level. The project is being developed at a cost of USD 1.7 billion. It was scheduled for completion by 2013. The development plan features luxury hotels, state-of-the-art spas, exclusive villas and apartments, and luxury townhouses set on the beach and in the mountains and select shopping and dining outlets, all surrounded by a championship golf course, marina, a wellness and eco-marine center.

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Dredging, reclamation and
shore protection, Soyo LNG

Angola is one of the world’s deep water oil exploration ‘hot spots’. More than 50 significant oil discoveries in Blocks 14, 15, 17 and 18 are believed to contain at least 10 billion barrels of oil. With the increase in oil production comes large quantities of associated gas. Historically, in the absence of a local market, associated gas has been flared or reinjected into the reservoirs. Sonangol, the state oil company, and some of its oil producing partners developed the Angola LNG Project to reduce flaring of gas and curtail gas injection. Angola LNG is a joint venture project involving the major oil producers in the country. Sonangol and Chevron are the co-leaders of the project; the other partners are Total, ENI and BP.

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Port construction, Vuosaari

Vuosaari Harbor is the most significant harbor project in Finnish history; in fact, it is unique even on a European scale. Both existing harbors in Helsinki’s city centre are being transferred to the eastern outskirts of the city. They are being replaced with a harbor with excellent traffic connections that can meet the increasing demand for cargo handling. The Vuosaari Harbor Center will provide a competitive and modern service package, with smooth connections between harbor operations and other logistical facilities. The harbor center will comprise the gate area, the closed harbor area and the adjacent Business Parks. The fairway to the Harbor Center will be 32 km long, at least 200 m wide, and 11 m deep. The port area comprises 150 ha, of which 90 ha will be land reclaimed from the sea.

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Dredging, reclamation,
reconstruction and environmental
monitoring works, Vilufushi

The Republic of the Maldives consists of 1,190 small coral islands grouped into 26 atolls. Only 200 islands are inhabited. On 26 December 2004, a tsunami originating from Indonesian waters struck the Maldives. This natural disaster had major economic, social and environmental consequences. Of the 200 inhabited islands, 13 were totally destroyed and 56 suffered major damage, including the island of Vilufushi in Thaa Atoll. Houses and infrastructure were heavily damaged. All the surviving residents had to be evacuated to the neighboring island of Buruni to the west of Vilufushi. The government of the Maldives decided to reconstruct the entire island and to extend it considerably by landfilling the shallow reef. Boskalis International was appointed for this work.

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Land reclamation, Half Moon Bay Island Manama

‘Half Moon Bay’ island is situated in the Seef area of Manama in the Kingdom of Bahrain. The purpose of the island is to accommodate a future 5 Star Hotel development as well as several villas. Engineering Department Hydronamic was engaged to develop the design of the island and to provide advisory services to Boskalis Westminster Middle East. Through good co-operation between the design engineers of Hydronamic and the construction team of Boskalis Westminster Middle East innovative ideas were developed which could be integrated into the rock protection design resulting in the successful and efficient construction with significant cost savings to the project.

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Cleanup petroleum harbor, Amsterdam

The Amsterdam Petroleum harbor on the North Sea Canal has been used for the storage and transshipment of oil products since its construction in 1887. Over many years routine operations and unchecked discharges resulted in severe contamination of the harbor.

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Dredging & Inland Infra

Offshore Energy

Salvage

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More infra solutions

Land reclamation

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

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Coastal protection

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

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Environmental services

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

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Roads and railways

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

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Inland ports and waterways

Boskalis designs, builds and maintains inland ports and waterways.

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