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In the large-scale reconstruction of the De Nieuwe Meer junction, Bonneveld and its partner Joosten Concepts are responsible for a challenging part of the work: the construction of pile mattresses and reinforced soil structures. Over a length of approximately 2 kilometers, from Amstelveenseweg to beyond the junction itself, work is being carried out on both sides of the road to create a settlement-free foundation that will enable future widening.
The subsoil at the site has low bearing capacity. “Since there is too little space and time to apply preloading, it was decided to relieve the subsoil. This is done by means of a pile mattress, which allows the final road to be constructed in a single phase without any settlement,” explains Peter Koelewijn, work planner at Bonneveld Gewapende Grondconstructies. The company was brought in by the TriAX construction consortium during the tender phase to explore the possibilities. “After the contract was awarded, we were involved in the further design of the foundations, and since October 2024, we have been working on the outdoor construction.”
The pile mattress is carefully constructed by Bonneveld Gewapende Grondconstructies. “We first place so-called pile caps on the pile and strut piles drilled by the TriAX construction consortium,” explains Hans van Beek, site supervisor at Bonneveld Gewapende Grondconstructies. “This involves a total of around 4,000 prefab concrete pile caps. We fill the space between them with sand. We then roll out geotextiles, supplied by Joosten Concepts, onto which we apply mixed granulate and compact it into a layer of approximately 80 centimeters. We fold the geotextiles closed, creating a self-supporting structure that serves as the foundation for the new road construction. In the unlikely event that the ground beneath it subsides, the foundation will remain strong enough to support the road construction above.”
At some locations, the pile mattress also forms part of the foundation for the abutments of the new bridges. “The abutments then rest partly on strut piles and partly on our pile mattress construction and on the reinforced soil construction that lies on top of it,” says Koelewijn. In the middle of the De Nieuwe Meer junction, Bonneveld is working on a special construction consisting of 26 layers of reinforced soil with a thickness of 60 centimeters per layer, a combination wall of 27 steel pipe piles with a diameter of 1.5 meters to prevent the reinforced soil from sliding. A combination wall has been erected in front of this construction to prevent sliding. “Using our specially developed in-house high-pressure pump, we first emptied these pipes, cleaned them, and then filled them with concrete to support the reinforced soil construction we are currently working on.”
Bonneveld is working on ten different locations simultaneously on the project, which, according to Van Beek, is characterized by very limited space. “Sometimes there is only 1 meter of working space between the construction site and the adjacent buildings, which requires adapted working methods. For example, where we normally need 3.5 meters for shoring walls, here we are working with special internal support structures.” Koelewijn adds: “Concrete walls weighing 15.5 tons each are delivered prefabricated and installed by us on the concrete base, which in turn rests on the pile mattress. These are active walls that function as formwork during construction and later as a permanent visible wall along the road.”
The realization of the pile mattress and reinforced soil structures at the De Nieuwe Meer junction is a technical and logistical feat. Environmental factors also play a role: nearby schools, bicycle traffic, and limited access and exit routes require careful coordination on a daily basis. Thanks to early collaboration, smart construction solutions, and customization in the execution, a solid foundation has been laid for the future expansion of this important traffic junction. This is a great example of how Bonneveld contributes to a solid foundation for the accessibility of Amsterdam and the Randstad.
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Bonneveld is a specialist groundwork contractor in utility and infrastructure construction. A family business with the standards and values that come with it. We think along, are careful, have an eye for the long-term vision and are committed to the entire project and the relationship. We believe in a flexible and transparent attitude. With us, you get what you [...]
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