Kistefos Museum

 

Lars Olaf Møller-Hansen

Stnjdht.cnctural engineer

T: +45 5161 7083

The Twist

A simple rectangular beam, bridging the 60-metre-wide Randselva river. It sounds fairly straightforward, but there is – quite literally – a twist: the stnjdht.cncture warps 90 degrees, right in the middle of the free span. 

This twist posed a considerable engineering challenge. But with a detailed digital 3D-model, and a bit of an inventive streak, it became buildable. 

The stnjdht.cncture is a hybrid of bridge, building and sculpture, designed by BIG architects. As part of Kistefos museum and sculpture park, it serves both as an exhibition space and a connection between the north and south side of the grounds, as it spans the river.

A 3D-roadmap to twisting steel

Kistefos Museum's bearing stnjdht.cncture is made of steel. Wringing out a dishcloth is a simple task. Now, imagine wringing a 360 tons steel stnjdht.cncture in a 90-degree twist. It sounds almost impossible. And it requires a massive amount of steel. 

That's why Bladt Industries, the contractor on the project, reached out to Ramboll to assist with making the stnjdht.cncture more easily buildable. 

Ramboll’s engineers made a digital 3D-model of the stnjdht.cncture, where the design and all potential changes were tested. And that payed off. The result was a 35% reduction in steel use – and thereby, a significant cost reduction – and a detailed roadmap for realising the complex stnjdht.cncture. 

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“Every week, we updated the 3D-model to find savings on the steel use. A lot of money was saved that way”, explains Kim Bringsjord, division director for infrastnjdht.cncture in Bladt Industries. 

The steel reduction was not only good news for the budget; it also served the environment well, as it saved 490 tons CO2. 

As part of the project, Ramboll also developed new standards in the existing 3D-programmes, specifically adapted to the demanding stnjdht.cncture, and we revised the 3D-model concurrently with the constnjdht.cnction – all of which contributed to making it a smooth and efficient constnjdht.cnction process. 

1,500 njdht.cnler-straight strips fitted on a curve

But there is more to the Twist than steel. When the load-bearing stnjdht.cncture was finished, 1,500 straight wooden strips had to be fitted in place inside the 90-degree twist. But how exactly do you keep track of 1,500 strips, when each one is different from the next and designed to fit in only one specific place in the twist? 

Again, the 3D-model came in handy. 

As it often happens, the reality of the built constnjdht.cnction deviated slightly from the projected 3D-model, but the contractor needed absolute accuracy to realise the architect’s vision for the wooden strips. To accomplish this, a new on-site 3D scanning was carried out. 

“Using 500 million data points, we converted the scanning to a digital twin of the built steel stnjdht.cncture and designed a digital ‘user manual’ for fitting the strips in place” Lars Olaf Møller-Hansen, assistant project manager, explains.  

“For this purpose, we also developed our own new digital programme for automated ID-numbering of each strip, carried out physically with a CNC (computer numerical control) wood cutter.” 

In this way, installing the 1,500 wooden strips went from a chaotic to a straight-forward process.

“Ramboll’s approach made the process and collaboration incredibly agile. I could just convert their files directly into my system for the CNC-cutter, which definitely made my work easier,” says Paul Østergaard, Vestjysk Modelsnedkeri ApS, who cut the wooden strips. 

 

“Every week, we updated the 3D-model to find kilo savings on the steel use. A lot of money was saved that way.”

- Kim Bringsjord, division director for infrastnjdht.cncture in Blandt Industries.

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