New Amsterdam Metro: Noord/Zuidlijn

New Amsterdam Metro: Noord/Zuidlijn

Benthem Crouwel Architects
Amsterdam, Netherlands
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Benthem Crouwel Architects

©Jannes Linders

New Amsterdam Metro: Noord/Zuidlijn

Benthem Crouwel Architects como Arquitetos

After 20 years of politics, engineering, designing and building, the new Amsterdam metro link from the north to the south will open mid 2018.

Almost there BenthemCrouwel Architects has designed seven metro stations: two stations above ground and five stations underground, along a route that is almost ten kilometers long. The stations are almost finished; the trains are test driving at this moment and in a year's time Amsterdam residents, commuters, tourists, day trippers, and metro admirers are able to travel from the north to the south in just 15 minutes.

Soggy soil

The task of engineering an underground metro 25 meters deep in the soggy soil of historic Amsterdam, built on long wooden stilts around 1300, was not an easy one. Thanks to a new engineering technique of tunnelling shields that was developed in the late nineties, it became possible to create tunnels - at certain levels even 30 meters deep - in Amsterdam's wet and unstable ground, without affecting the city too much.

Intuitive routing

Each station is unique. Its architecture is determined by the different locations and by the space allowed by the Amsterdam city plan. At the same time, all stations are related to each other, and share amain architectural concept: the shortest possible connection between the underground platform and street level, and a logistics routing that flows in one continuous movement. Travelersare able to find their way intuitively. The use of daylight as a guiding principle and avoiding an underground labyrinth of passages, spoke to the selection committee in 1995. What followed was the assignment to BenthemCrouwel Architects of creating seven new metro stations: Noord, Noorderpark, Amsterdam Central Station, Rokin, Vijzelgracht, de Pijp, and Europaplein.

Undergound art route

A unique artwork that identifies with the location and offers orientation to the travelers, was commissioned for each individual station. The pieces connect the subterranean with the world above ground, creating an underground art route by (inter)national artists, accessible to everyone. Additionally, station Rokinwill exhibit a selection of the700.000 archaeologicalobjects that were excavated during the construction.

The opening date is the 22nd of July, 2018.

The Noord/Zuidlijn in Amsterdam: a public museum

Mosa como Fabricantes

In the 1990s, plans were made to construct a new metro line in Amsterdam, representing a complex task in a densely populated city. This metro line entered into service in the summer of 2018. Its route includes eight metro stations, one of which is Amsterdam Centraal station, that form a line straight through the city and bring the travelling time between the outermost areas of the region to within just fifteen minutes. The route is 6 miles long, of which a total of 4 1⁄2 miles are underground (beneath the city center). Aside from being a true feat of design, management, and material use, the Noord/Zuidlijn is home to breathtaking art.

Each station has its own identity thanks to specially designed works of art, including the gates in Noorderpark station made by Broersen & Lukács, Tee’s 100,000 tulip petals in Centraal station, Dewar & Gicquel’s piece exhibiting the archaeological finds at Rokin station, and Van der Kaap’s cinematic artwork in Europaplein station. Each piece makes each station unique and invites passengers to embark on an underground museum tour to view and admire all eight works of art. Most stations are sure to make a huge impression, especially Station Noord, with Harmen Liemburg's piece titled Flyways.

Architecture and guiding art

Benthem Crouwel Architects was tasked with designing seven of the stations on the Noord/Zuidlijn in Amsterdam. The architect Joost Vos says, ‘Our vision of this project was that passengers should be able to go from the platform to the city as quickly as possible. People don't like underground spaces, because they instill a sense of insecurity that is strongly linked to orientation and safety. That is why orientation by daylight is very important, so we ensured that light reaches far into the stations, supported by artificial light. Cooler light that people associate with daylight shines at the exits of the platforms, while fixtures that produce a warmer tone of light have been installed on the platforms themselves. We have worked to ensure a sense of familiarity in the stations by strongly emphasizing both daylight and artificial light and consistently using the same shapes, routes, glass, and ceramics. The eight works of art also contribute to this. On the Noord/Zuidlijn, art has been integrated into the architecture in a good way. It really represents an enrichment of the stations.’

Uniqueness at every station

Artist and cartographer Harmen Liemburg vividly remembers when he was called by Véronique Baar of QKunst. She asked him to participate in a sketch presentation for the artwork for station Noord. The theme had already been set: the piece, just like the metro line itself, had to follow the city's natural infrastructure and connect the station to its surroundings. Liemburg says, ‘Véronique acted as the link between the artists, the Metro and Tram department, the established Advisory Committee, and other parties. The sketch presentations we artists made were presented to those parties and to the people of Amsterdam during a pop- up exhibition.’

Véronique Baar recalls, ‘From the moment the first drawings were made, it was clear that art would be integrated into the architecture in a monumental and large-scale manner. We look to create variation to appeal to a diverse and mixed audience of passengers. We also wanted the designs to feature a perspective on the city of Amsterdam and showcase how Amsterdam relates to the world, without giving the artists an assignment that was too restrictive. After all, we had already specified technical and architectural frameworks for them to take into account. The independent Advisory Committee met during important stages of the process, such as to assess the choice of artists and works of art and to weigh the public’s views.’ Liemburg says, ‘I was pleasantly surprised when I heard that I had been chosen. My working method, converting found images into graphics, apparently suited their tastes.’

A parallel between passengers and migratory birds

Liemburg's work resembles comics on the topic of nature. Liemburg says, ‘The architecture and route layout are significant factors in how people feel in a certain space. Art literally completes the picture. It has to engage people. During this project, I thought it would be interesting to draw parallels between the different types of passengers, including people on a day trip, tourists, commuters... and migratory birds. In the nature reserves directly bordering station Noord in Amsterdam, there is a strip of allotment gardens, endless meadows with watercourses, areas of natural beauty, sunken moors, and waterfronts with reed beds. There are many birds to be found here, giving me plenty of inspiration.’

‘I studied those areas to learn which birds, or migratory birds, were present during which seasons and how they forage. I am fascinated by how birds, which have limited capabilities by our standards, can travel enormous distances to Africa and then find their way back to mate and brood. I respect their instinct-driven journeys, and I have reflected that in my work. I show how they orient themselves by using the starry sky and their view of the landscape before focusing on the birds themselves, such as common swifts, greylag geese, and black-tailed godwits. The piece of art is a perspective that changes constantly. The layering of the design was also necessary to tell the whole story and to make it interesting for passengers.’

Trial and error

Liemburg says, ‘It isn’t possible to view the entirety of the image at any one time. As you can only see what you are standing on, you discover new things each time you look. It was a real challenge, because the amount of detail I can include in my work is proportionally linked to the technique I use. I had to redraw the images I had selected and scanned, taking into account that the piece of art would be installed by water jet cutting. Water jet cutting uses a very high-pressure jet of water mixed with super-fine sand to cut tiles. When it came to scale, I made some mistakes when I started working. Ultimately, by evaluating the numerous test set-ups with all involved parties including QKunst, Mosa, and Mutsaerts, I knew how to change the scale to make my piece of work recognizable. In order to get a feeling for the entirety of the piece, I kept printing a number of square feet true to scale. By literally standing on those printed images, we got a better idea of what we were working on.’

Architecture must serve

In addition to testing with water jet cutting for Liemburg’s piece, Mosa's Quartz series tiles were tested for their functionality at an earlier stage. These tests focused on the tiles' walking safety, high-traffic use, cleanability, and durability as well as their appearance in terms of light reflection, structure, color and the clients' and architects' warmth-related requirements. The Quartz series – used to tile the floors of seven stations – had to evolve based on these requirements. Architect Vos explains, ‘We worked cautiously as, in our view, architecture must serve a purpose. Everything that stands out distracts people from their journey. The same holds true for the materials used, which is why we chose to use hard-glass, structured elements, and ceramic panels in part. We made the ceilings of white aluminium because it reflects the entire range of colors that humans can perceive and therefore positively influences light reflection. The acoustics have been improved thanks to a perforation in the material, which really ties the space together. We considered using granite for the floors but thought it was too fragile – that's why we went for ceramics. The Quartz series offers tiles that are extremely strong thanks to how they are fired. The shades we used are darker at the entrances, where daylight still reaches them, and lighter in color on the actual platforms.’

Custom design

Vos explains further, ‘Mosa made samples and test floors ranging from 60 to 100 square feet for us to assess both the color and light reflection. We didn't want a bland floor and were able to add more color and glitter upon request. It’s tailor-made, which we're glad to see is also possible for projects of this size. To see how the tiles would look after some time had passed and they had seen some use, we went to look at a project in Sittard, a city in the south of the Netherlands. Floors such as these have to withstand a lot, including thousands of people walking over them on a daily basis and the types of cleaning agents used on them. Aside from being aesthetically appealing for a long time, these floors need to be functional and accommodate passengers.’

A canvas spanning 3,900 square feet

Niels Mutsaerts of Mutsaerts BV was involved in the Noord/Zuidlijn from an early stage. His company was responsible for laying all the floors, including the tile finishes. This is how he came into contact with Harmen Liemburg. Mutsaerts says, ‘Harmen had something in mind and initially wanted to project his art onto the floor with light or apply it with paint. We started talking, and I suggested that it could be done by having the artwork cut into tiles. Although we had never done it on a scale as large as this before, I immediately imagined it on that huge 3,900 square-foot canvas. Naturally, we had to work carefully and precisely.’

‘By working together, we refined the idea. We opted for Mosa's anthracite-colored Quartz tiles for the platforms. If we milled the tiles, the piece of art wouldn’t be clearly visible. We therefore had to create a contrast by milling a white tile from the same Quartz series to create a negative effect and lay that one in the anthracite tile. Of course, we made test surfaces to bring Harmen on board with our idea and to implement

improvements. From the moment we started creating test surfaces, we worked with a fixed team of specialized tilers who would also lay the final work. By involving them at an early stage as well as through Harmen's close involvement, even during the final laying process, the whole process was extremely smooth. My team and I were proud to know that we weren't working on an everyday project. The fact that Harmen came to show his support motivated us even more.’

Combined ambition

Mutsaerts says, ‘The beauty of this project is in how it combines advanced technology and labor. The fact that we communicated a lot with all parties from the outset helped us create this fantastic final result.’ As a confirmation, Liemburg adds, ‘Collaboration is crucial on projects as complex as this one. Leaving the technique aside, you need to have an eye for detail and a will to achieve the quality you're aiming for. When we established that the Mosa tiles were well-suited for water jet cutting, we kept building on that foundation. I did have to consult with Mutsaerts’ work planner to find the right way to convert my designs into the files that the cutting machines uses. When we had that working, we could focus on a structure and precise method of cutting the tiles, numbering them as sets and packaging them before they were laid. The team’s combined ambition ensured that we made it happen.’

Baar and Vos also have fond memories of the project. Vos explains, 'It was a joy to work on the Noord/Zuidlijn. The results are as we envisioned: bringing the North and South closer together while making the stations both timeless and modern.’ Baar confirms this by saying, ‘From an artistic perspective, it was an honor to work on this project. This feeling really took hold when I noticed that everybody felt like they were going to be making a real difference with the art. That was the best moment for me.’

Noord/Zuidlijn in figures

- Around 120,000 people use the Noord/Zuidlijn (line 52) for travel each day.

- Line 52’s maximum speed is 45 miles per hour.

- The total cost of the project was 3.5 billion dollars, meaning roughly $3,500 for each resident of Amsterdam.

- Around 700,000 objects were found by archaeologists, of which 10,000 have been put on exhibition.

- Harmen Liemburg’s Flyways is 430 feet long and 43 feet wide, encompassing around 6,700 tiles.

- Mosa Quartz tiles: 12 x 24 inches.

- A total of 130,000 square feet of tiles were laid when combining all of the stations. Together, this amounts to a total of approximately 200,000 tiles.

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