The world’s tallest wooden building is ground-breaking for more than just its height. When the Norwegian building, Mjøstårnet , was to be built, design company, Moelven, decided to employ a completely new and untested assembly technique.
“Some may think that there is great risk involved in using a new assembly method on such a large and prestigious project. However, following many years of development, we were ready to take a new step,” says Lars Ivar Lindberg, Assembley Manager at Moelven Limtre.
It’s not totally new territory for the designers. In 2014, the designers completed the, then, highest wooden apartment building Treet in Bergen. But that structure, with a height of 51 metres across 14 storeys, was first assembled in a factory, before being transported to the building site for final assembly. However, with the latest – and taller – building Mjøstårnet, its timber beams are being taken directly to site, without any form of trial assembly.
Lego for grown-ups
“This is accuracy taken to the extreme. The beams arrive fully processed at the building site, and there they have to fit down to a millimetre. There is no scope for errors in the assembly. The principle is almost like Lego for grown-ups. All of the pieces have a specific place and must fit,” Lars says.
This construction method also ensures that building Mjøstårnet is much faster. When the world’s tallest wooden building is completed in March 2019, Moelven will have hoisted several hundred glulam beams into place in the structure over the course of 10 months.
“This assembly method is very efficient in terms of time, and will become the new standard for glulam structures like this,” Lars says.
Several storeys in one hoist
Assembly has taken place using a large crane at the building site. No external scaffolding has been used. When Moelven has hoisted the glulam structure into place, several storeys have been hoisted at once.
“We’ve hoisted 4-5 floors at a time. Then we’ve complemented them with Trä8 flooring elements. These are really huge structures, and it’s an incredible feeling to watch almost 20 metres of the building’s height being hoisted into place in one go. Both the building and our pride grow in tandem,” says Lars of Moelven Limtre.
See the assembly of the world’s tallest wooden building