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Although the recession has all but put paid to Dublin鈥檚 boomtime proposals for bustling city quarters and towering skyscrapers, bits and pieces of notable architecture are still emerging. The latest to complete is Amanda Levete Architects鈥� bridge over the Royal Canal at Spencer Dock 鈥� a sculptural ribbon of concrete to rank alongside the famous Ha鈥檖enny Bridge and Santiago Calatrava鈥檚 James Joyce bridge on the Liffey.

The significance of Spencer Dock bridge to Amanda Levete is no less than it is to Dublin. It is the first project completed by her new practice, Amanda Levete Architects, which split from Future Systems earlier this year. Levete reveals that she and the late Jan Kaplicky, her former husband and co-founder of Future Systems, had been working separately for the past five years, but this is the first of her jobs to be completed. 鈥淚t marks a starting point,鈥� she says.

Like on all infrastructure projects, there were design restrictions. Built to accommodate two lanes of traffic and two tram lines, the 40m bridge, like O鈥機onnell Bridge, has to be almost as wide as it is long. 鈥淚t doesn鈥檛 have the elegance of a traditional bridge,鈥� says Levete. 鈥淭he question was, how do you deal with that?鈥�

The answer was to create a piece of sculpture. Created out of elegantly formed white concrete, the bridge flows sinuously from one side of the canal to the other. At the mid-point on each side the concrete curves outwards to create an open space, like wings or fins. Levete describes it as a 鈥減iece of landscape鈥�, linking to the surrounding landscape designs of French architect Agence Ter. 鈥淭here was no opportunity for structural acrobatics,鈥� says Levete. 鈥淲e wanted to celebrate concrete as a material.鈥� The dazzling white of the bridge was created by using white limestone and white cement in the concrete mix.

The level of formwork required to create the bridge was highly advanced, says Peter Feldman, one of the project architects. 鈥淲e wanted to keep as large a degree of control of the geometry as we could,鈥� he says. 鈥淭he key was to research as much information about it as we could, so that tenderers would not be put off by the complexity.鈥�

The practice experimented with different types of polystyrene formwork to cast the concrete. After exhaustive testing, a high-density polystyrene coated in resin was used to give it a smooth finish. Levete says the texture of the concrete was extremely important, as visitors pass on the towpath underneath the bridge as well as over it. 鈥淲e wanted to create a stark contrast between the dark water of the canal and the white of the concrete,鈥� she says. 鈥淵ou get real play of the reflection of the water on it.鈥� Joint lines in the concrete emphasise the geometry.

There was no opportunity for structural acrobatics. We wanted to celebrate concrete as a material

Amanda Levete

The structural complications didn鈥檛 end with the scale of the bridge. The insitu concrete deck is extraordinarily shallow 鈥� just 600mm thick in parts 鈥� and the architect had to work closely with Arup to make sure the drainage systems could be embedded in it without disrupting the design. Troy Burden, a director at Arup, said an 鈥渆ye-opening鈥� level of collaboration on 3D models ensured that design and engineering were expertly intertwined.

Levete agrees, saying that the project team had overturned concerns that the designs would be problematic. 鈥淓veryone really bought into the concept, and it was completed this year on time and slightly under budget.鈥� Although the work of Levete and her team is finished, the bridge is not quite complete 鈥� in a few weeks the Dublin Docklands Development Authority will begin work on the tramlines. It will open to the public next year, at the same time as the Agence Ter landscaping.

So what does this bridge tell us about the emerging style of Amanda Levete Architects when compared with that of Future Systems? The shades of blobitecture 鈥� surely up there with 鈥渟tarchitect鈥� as one of the least popular portmanteau words in modern architecture 鈥� are still present, but have been morphed into something more lithe, shapely and (dare I say it) commercial. The trouble with the 鈥済eometricism鈥� movement heralded by Future Systems is that many of its challenging concepts remain just that, rather than completed buildings.

It鈥檚 encouraging then, that Levete鈥檚 first completed piece of construction out of that practice鈥檚 shadow is not an enormously expensive bank headquarters or Dubai skyscraper but an elegant piece of civic architecture, delivered within a public sector budget. As the director herself puts it: it鈥檚 a starting point.

Original print headline - Crossover