The ARK Bridge: DYWIDAG Strand Tendons contribute to Amsterdam’s largest Infrastructure Project

A huge infrastructural project is currently under construction in the metropolitan area of Amsterdam. The SAA Project (Schiphol-Amsterdam-Almere Project) will improve the motorway network between Amsterdam, Schiphol Airport and the city of Almere, which is located east of Amsterdam. The total length of the project is 63km, and in addition to new lanes and motorway sections, the project includes a tunnel, an aqueduct and approximately 100 bridge structures. Construction work started in 2012 and is scheduled for completion in 2026.

One of the major structures in this project is the ARK Bridge that accommodates the new motorway section crossing the Amsterdam – Rhine Channel. The Joint Venture SAA one submitted proposals for several structures that are being built within the scope of this major project. The Joint Venture was awarded the contract for the ARK Bridge because it made the most attractive DBFMF-proposal (Design, Build, Finance, and Maintain) for this bridge. The design had to provide sufficient clearance for container and cargo ships which frequently travel on this important channel connecting Amsterdam with various German cities along the River Rhine.

The ARK Bridge consists of 3 parallel concrete hollow box girder bridges with a total length of 284m. The structures have main spans of 142m and side spans of 71m each. The northern and the southern bridges are double cell box girders with 20.9m respectively 17.6m wide bridge decks. The middle bridge is a single cell box girder with an 11.25m wide bridge deck.

The bridges were built using the balanced free cantilever construction method. The first 7 segments on both sides of the hammer heads are 4m long, and the following segments are 5m long. The depth of the bridge varies between 6.25m at the pylons to 2.75m in the middle of the main span.

In order to limit the construction time of the bridge superstructure, 3 sets of form travellers were used for an almost simultaneous erection of the segments at the 3 pylons. On average, the bridge segments were erected in a weekly cycle. First of all, the reinforcement and post-tensioning tendons were installed. After pouring the C70/85 concrete, the transverse and longitudinal Post-Tensioning tendons were stressed. Subsequently, the form travellers were moved to the next position, and the formwork was prepared for the next cycle. The DYWIDAG Tendons were stressed a day after the concrete was cast.

DSI Netherlands assisted SAAone in the final planning phase for post-tensioning and supplied, installed, tensioned and grouted the DYWIDAG Post-Tensioning Tendons in all bridges.

In the 3 new structures, the following DYWIDAG Strand Tendons, 1,860N/mm2, with a strand tonnage of 1,060t were used:

  • 1,530 Type 4-0.62" DYWIDAG Strand Tendons with Type SD 6804 Anchorages as transversal tendons in the bridge deck
  • 504 Type 15-0.62" DYWIDAG Strand Tendons with Type MA 6815 Anchorages as longitudinal tendons in the top concrete slab
  • 178 Type 19-0.62" DYWIDAG Strand Tendons with Type MA 6819 Anchorages as longitudinal tendons in the bottom concrete slab

Thanks to the secure planning and the excellent collaboration between all parties involved, the superstructures were completed according to plan. DSI is proud to have contributed to the realization of this bridge with expertise in Post-Tensioning and the matching DYWIDAG products. DSI Netherlands is involved in other sub-projects of the SAA Connection and delivers a valuable contribution to this important infrastructural project with know-how and high-quality products.


Rijkswaterstaat (Department of the Dutch Ministry of Infrastructure and Environment), Netherlands

General Contractor

Joint Venture SAAone, consisting of Koninklijke Volker Wessels Stevin N.V. (VolkerWessels), Royal Boskalis Westminster N.V. (Boskalis), HOCHTIEF PPP Solutions Netherlands B.V. and Dutch Infrastructure Fund B.V. (DIF), all of them Netherlands

Subcontractor Post-Tensioning

DYWIDAG-Systems International B.V., Netherlands

DSI Scope

Production, supply, installation, technical support

DYWIDAG Products

1,530 Type 4-0.62" DYWIDAG Strand Tendons, 504 Type 15-0.62" DYWIDAG Strand Tendons, 178 Type 19-0.62" DYWIDAG Strand Tendons

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