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Mitsui Fudosan breaks ground on Japan's largest wooden office building in Tokyo

18:08 | 17/01/2024

(Construction) - Tokyo-based real estate developer Mitsui Fudosan announced on January 11th that it has begun construction on the Nihonbashi Honcho 1-chome No.3 Project, a wooden office building in Chuo-ku, Tokyo.

Mitsui Fudosan breaks ground on Japan's largest wooden office building in Tokyo
Mitsui Fudosan breaks ground on Japan's largest wooden office building in Tokyo

With a total floor area of approximately 28,000 square meters and a height of 84 meters, it will become the largest wooden structure in Japan. The design and construction works are commissioned to Takenaka Corporation, leveraging the company's technology to enhance fire resistance of wooden structure. The construction began on January 4th, with a target completion date of September 2026.

The building is planned to be an 18-story wood/steel structure with a total floor area of 28,000 square meters, accommodating rental offices, rental labs, and retail spaces. The project will employ fire-resistant laminated lumber developed by Takenaka Corporation, known as "Moen Wood," as a major structural component. This construction material includes a "fire stop layer" made of mortar and gypsum sandwiched between the load-bearing structure and the surface wood, providing a maximum fire resistance of three hours to prevent collapse in the event of a fire. Seismic walls will be constructed using CLT (Cross-Laminated Timber). Wood will also be actively used for interior and finishing materials, creating a building with the warmth and fragrance of wood.

The expected amount of wood used is approximately 1,100 cubic meters. The carbon dioxide sequestration effect of wood is anticipated to fix about 800 tons of CO2. The projected CO2 emissions during construction are expected to be reduced by approximately 30% compared to a similar-sized conventional steel structure office building. (2024/01/12)

The Daily Engineering and Construction News of Japan

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