HomeProjectsRetaining walls as foundation for sound barriers along the N206

Retaining walls as foundation for sound barriers along the N206

Bosch Beton increasingly more often is being approached for supplying retaining walls for sound barriers along motorways. Thus it was also approached for the construction of the RijnlandRoute near Katwijk, a municipality in the Province of Zuid-Holland. At the request of Holland Scherm BV, Bosch Beton supplied 280 metres of prefab retaining wall for this project as a foundation for new sound barriers along the Tjalmaweg road near Valkenburg.

Improved traffic circulation

The RijnlandRoute is the largest infrastructure project of the Province of Zuid-Holland. Between Katwijk, at the A44 motorway and the A4 motorway near Leiden, a new road connection has been under construction in recent years. This major infrastructure project was developed to improve traffic circulation and improves the liveability, accessibility and economic development of the Holland Rijnland region. The route consists of three project components, one of which is the N206 project, the Tjalmaweg.

The RijnlandRoute is on record as being the most advanced road construction undertaking in the Netherlands, in part because the N206 lanes are recessed. Boskalis Nederland was selected to carry out the work on the Tjalmaweg. Under contract to, and in cooperation with Boskalis, Holland Scherm BV was responsible for the construction of sound barriers. They elected to make use of Bosch Beton retaining walls as a foundation for the sound barriers. The retaining walls and sound barriers are equipped with connecting durable wood slats for climbing plants in the future to attach themselves to as they grow.

Custom work and efficiency

This project made use of LR-retaining walls with heel. This type of retaining wall was specifically developed for heavier load applications in the civil engineering sector and is available in various lengths. A portion of the retaining walls for the RijnlandRoute required custom work to be able to guarantee a strong foundation. Multiple retaining walls were produced with additional rebar reinforcement and with mitre joints and recesses.

The installation of the retaining walls was divided into two phases, whereby a total of 140 retaining walls were delivered. Normally, a pile foundation is used for the construction of sound barriers. Concrete is subsequently poured onto this foundation and columns are then installed on this construction. However, for this project the concrete pile foundation was replaced with 3.5-metre high prefab retaining walls. As a result the foundation also has a soil-retaining function, which enables it to make up for the difference in height at the back of the construction. Furthermore, because of these prefab retaining walls, installation was many times faster and more efficient, and ultimately it took just four days to construct the foundation for the sound barriers.

More information

If you would like to know more about this project or about the custom solutions we are able to provide with our retaining walls for roads and traffic, contact our advisors without obligation.