Artez

Whereas underground construction is technically difficult in itself; local conditions made it even more complicated. Groundwater flows half a metre below ground level from the lateral moraine to the Rhine. In addition, at high water levels, the Rhine drives up the groundwater, thus exerting an even greater load on underground structures. The dimensions of the concrete casing are therefore especially massive and the structure has a lifespan of at least 100 years. As is to be expected from an architect such as Henket, the special structure required for underground construction is partially visible. Four beautifully detailed cast props help withstand the soil pressure. They are designed to prevent the building from being compressed due to the lateral moraine and the groundwater from the Rhine – should the steel sheet piles with the grout anchors ever rust through. The entrance to the 11-metre deep school building is via the basement of the Rietveld building. Stairs and walkways provide access to the various classrooms, exercise rooms and offices. In case of fire, three staircases lead the students directly to the outside. ABT provided construction and geo-technical consulting services for this complex undertaking. The design for the construction pit is some 42 by 97 metres and measures 14 metres deep. The floor has been laid using underwater concrete and owes its bearing strength to foundation piles. In order to allow daylight to enter, the roof construction – which can be walked on – has been designed to be completely transparent above the building’s atrium.