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Japanese architects have unveiled plans forthe world's tallest wooden skyscraper.


The 1,148-feet (350-metre) tower, housingshops, homes, offices and a hotel, will become the tallest building in Japanwhen it is completed in 2041.


Positioned in central Tokyo, the aim of the£4.2 billion ($5.9 billion) structure is to turn the Japanese capital into anenvironment-friendly city and help 'transform the city into a forest',architects behind the plans said.


Designs for the structure were drawn up byTokyo-based architectural firm Nikken Sikkei, but the building will beconstructed by the Forestry arm of the Sumitomo Group, one of Japan's largestbusiness conglomerates.

该建筑的设计方案由位于东京的Nikken Sikkei建筑师事务所(即日建设计)起草,不过将会由日本最大的商业集团之一住友集团的林业部建造。

Currently referred to as the W350 Project,named after its height, it is not clear which wood or woods have been chosen asthe building material.


The tower has 70 stories above ground andis made of a combination of wood and steel, with more than 6.5 million cubicfeet (0.2 million cubic metres) of wood making up 90 per cent of theconstruction material.


Nikken Sekkei's plans outline a braced tubestructure that is able to withstand strong winds, as well as Japan's frequentearthquakes.


As well as offices, a hotel, shops andresidential units, the completed tower will feature a garden roof, balconiescovered with greenery, water features and large internal open spaces filledwith natural light.


Brock Commons Tallwood House, a174-foot-high (53-metre) student accommodation tower opened at the Universityof British Columbia in Vancouver, Canada, last autumn, holds the current recordfor the world's tallest primarily wooden building.

Brock Commons Tallwood House是去年秋天在加拿大温哥华的不列颠哥伦比亚大学公开的一栋174英尺(53米)高的学生宿舍楼,它保持着目前世界上最高的主体木质结构建筑物的记录。

The structure (left) will stretch more thansix times the height of the current tallest primarily wooden building in theworld, Brock Commons Tallwood House (second from left) in Vancouver, Canada.The 174-foot-high (53-metre) student accommodation tower opened at the Universityof British Columbia last autumn

(图解:该建筑(左)的高度将超过目前世界上最高的主体木质结构建筑Brock Commons Tallwood House(左二)高度的六倍。

The 24-storey HoHo Tower is set to top thiswhen it opens later this year in Vienna, Austria, with the structure set toreach 275 feet (84 metres) high upon completion.


Housing office units, apartments and ahotel, 76 per cent of the building will be constructed from wood, saving 2,800tonnes of carbon dioxide emissions over similar structures built out of steeland concrete.


A rising number of architectural firmsacross the globe are turning to wood as their primary construction material,though few match the ambitions of the W350 Project.


A rising number of architectural firmsacross the globe are turning to wood as their primary construction material,though few match the ambitions of the W350 Project


'New technological advances withconstruction techniques and composite wood make this a very exciting area atthe moment', Riccardo Tossani, who designed a retirement home on Mount Fujithat is the current largest habitable wood structure in Japan, told theTelegraph.


'It is in many ways the ideal materialbecause it is a renewable resource as well as being somewhat recyclable.'


Before construction of the W350 Projectbegins, Sumitomo Forestry Co must first traverse stringent Japanese fireregulations.


Despite relying on wood to build houses forgenerations, Japan has largely banned the material in construction because ofits flammability - a weakness laid bare by firebomb raids on major citiesduring World War II.


Officials have begun to loosen these regulations,allowing Japanese architects to explore wooden designs


But officials have recently begun toloosen these regulations: Japan's new national stadium currently underconstruction in central Tokyo for the 2020 Olympics Games uses wood in thedesign.


'For Japan, it is an excellent buildingmaterial because it is readily available, it is pliable and appropriate for aseismic environment,' Mr Tossani said.
'Wood gives or flexes with movement in theground or absorbs movement in its joints; concrete is rigid and does not havethat flexibility, so it can crumble'.