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World's tallest timber skyscraper planned for Tokyo, as design team pledged to 'transform cities into forests'

We aim to elicit and enhance the appeal of forests, timber resources, greenery and trees to contribute to people, society and the global environment
– Sumitomo Forest

Japanese architecture giants Nikken Sekkei have partnered with construction firm Sumitomo Forest to create the world’s tallest wooden skyscraper, which they hope will inspire the transformation of “cities into forests” around the globe.

Located in central Tokyo, the timber tower, tentatively called the W350, is set to be completed by 2041 to celebrate Sumitomo Forest’s 350th anniversary – a milestone that has informed its anticipated height of 350m (1,148ft).

The structure has been designed with 70 storeys and over 455,000sq m (4.9 million sq ft) of floor space. When completed, it will house hotels, shops, leisure facilities, offices and residences.

An estimated 90 per cent of the building will be constructed using timber materials – 185,000m³ in total, equivalent to the amount used for 8,000 wooden houses. A hybrid wood and steel structure will provide support, with steel frame vibration control braces positioned inside columns and beams. The architects claim this make the building resistance to lateral forces such as earthquakes or wind. The interiors will be formed purely of wood, “producing a calm space that exudes the warmth and gentleness.”

The skyscraper has been designed with balconies that continue around all four sides of the building. These feature greenery at every level, connecting the ground to the top floors and “giving a view of biodiversity in an urban setting.”

Sumitomo Forest’s long-term aim is to use the project as a dramatic prototype encouraging governments, developers, engineers and architects to embrace wooden architecture for high-rise buildings.

The company’s Tsukuba Research Institute is concentrating its efforts on expanding possibilities for wooden buildings – developing building methods, improving environmentally-friendly technologies, enhancing fire and seismic resistance and reducing construction costs.

The mooted cost of the W350 is 600bn yen (US$5.6bn, €4.5bn, £4bn) – almost double that of a conventional high-rise building constructed with current technology.

In a statement explaining why they are investing so much time and money in timber construction, Sumitomo Forest said: “Such buildings create a comfortable environment for both plants and living organisms, providing a pleasant space for the people living there and in the surrounding city.

“These structures are like a forest, a habitat for living things. The number of wooden buildings in urban areas is increasing. Under this concept, Buildings that are full of greenery will form a network that is linked to the biosphere of living creatures such as wild birds and insects, contributing to the biodiversity of cities.

“If the timber usage volume can reach the same level as forest growth volume, this would promote forest maintenance such as thinning and replanting, helping to maintain forests in a healthy state and securing Carbon Dioxide absorption volume.

“It is our objective to become the world’s strongest player in terms of technology for increasing the possibilities of wood. We aim to elicit and enhance the appeal of forests, timber resources, greenery, and trees to contribute to people, society, and the global environment.”

The company added that timber parts in its towers can be replaced after a period of time, and re-processed for use as housing and building materials “promoting circulation in the city,” while waste wood can fuel for biomass power generation and used for processes such as drying timber – facilitating cascade utilisation.

CLADglobal reviewed the development of timber engineering two soaring towers connected by the world’s largest cantilever in Dubai; a 24km (15m) public greenway running the length of Singapore on a disused railway track; and the renovation of Barcelona FC’s iconic Nou Camp stadium – which itself features a number of timber elements.

Tokyo  Nikken Sekkei  timber towers  Japan  Sumitomo Forest 
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FEATURE: Ask the experts – Timber towers

FEATURE: In the spotlight – Tadao Kamei

Japanese architecture giants Nikken Sekkei have partnered with construction firm Sumitomo Forest to create the world’s tallest wooden skyscraper, which they hope will inspire the transformation of “cities into forests” around the globe. Located in central Tokyo, the timber tower, tentatively called the W350, is set to be completed by 2041 to celebrate Sumitomo Forest’s 350th anniversary – a milestone that has informed its anticipated height of 350m (1,148ft). The
CLD,ARC,DES,ECO,TEC
Sumitomo Forest wants cities to become forests, with developers turning their attention to timber high-rises / Sumitomo Forest
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