Dutch open 'world's first 3D-printed bridge'

A 3D printer laid some 800 layers of concrete to create the eight-metre bicycle bridge in the Dutch town of Gemert
A 3D printer laid some 800 layers of concrete to create the eight-metre bicycle bridge in the Dutch town of Gemert

Dutch officials toasted on Tuesday the opening of what is being called the world's first 3D-printed concrete bridge, which is primarily meant to be used by cyclists.

There was applause as officials wearing hard hats and workmen's jackets rode over the on their bikes at the inauguration in the southeastern town of Gemert.

"The bridge is not very big, but it was rolled out by a printer which makes it unique," Theo Salet, from the Eindhoven University of Technology, told Dutch broadcaster NOS.

Work on the bridge, which has some 800 layers, took about three months after starting in June and it is made of reinforced, pre-stressed concrete, according to the university.

"One of the advantages of printing a bridge is that much less concrete is needed than in the conventional technique in which a mould is filled," it said on its website, adding "a printer deposits the concrete only where it is needed."

The eight-metre (26-foot) bridge spans a water-filled ditch to connect two roads, and in conjunction with the BAM Infra construction company was tested for safety to bear loads of up to two tonnes. Although designed for bikes, it could take up to 40 trucks, the designers said.

"We are looking to the future," said the head of BAM, Marinus Schimmel, adding in a statement that his company was constantly "searching for a newer, smarter approach to addressing infrastructure issues and making a significant contribution to improving the mobility and sustainability of our society."

3D printing meant "fewer scarce resources were needed and there was significantly less waste," he added.

The Netherlands is among countries, with the United States and China, taking a lead in the cutting-edge technology of 3D printing, using computers and robotics to construct objects and structures from scratch without using traditional manpower.

Last year a Dutch architect unveiled a unique 3D printer with which he hopes to construct an "endless loop" building.

And a Dutch start-up called MX3D has begun printing a stainless-steel bridge, of which a third is already completed. The aim is to finish printing by March and lay the bridge over an Amsterdam canal in June.

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© 2017 AFP

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Oct 17, 2017
Nice, but can they 3d print swamp land?

Oct 19, 2017
No mention of cost of course.

Oct 19, 2017
Im sure it cost a lot considering its an experiment.

Im more concerned with the 3D printing method. Each layer forms a construction joint which is a weakness. The concrete ends up curing at different rates and the crystals dont grow monolithically like you want them to be. Those weaknesses allow water to get to the reinforcement quicker than if it were monolithic.

Also, its rated for 2 tonnes, but can take 40 trucks? That makes no sense.

Oct 19, 2017
No mention of cost of course.

Less material and next to no workers needed. Apart from the initial investment in the machine (which is reusable) I think it's a fair bet that using this technology will save some money in the future.

Also, its rated for 2 tonnes, but can take 40 trucks? That makes no sense.

It's not *rated* for 2 tonnes. It was *tested* with 2 tonnes (which is ample for what the bridge will ever have to bear). There's no point testing it with 40 trucks because they wouldn't even fit (at 8.5 meters you could fit one).

Oct 19, 2017
I read that too quickly before posting.

Looking at the pictures of the prestressed steel, its grossly over engineered and even less economical. I know its a new technique but a structure shouldnt be designed for loads it wont ever take.

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