INSIGHTS

2023.01.30

MEP Engineering designers talk. Environment and Facility Idea Note Vol. 06

Contributing to the BCP of the entire town through "water independence"

Otemachi Financial City Grand Cube

MEP Engineering designers talk. Environment and Equipment Idea Note TOP

Functions required for a "disaster prevention base building"

Achieving complete independence through a system for "making" and "discarding" water

この建物には、敷地内で掘削した井戸水を飲用可能なレベルまで処理できる「井水処理設備」が設置されています。井水は、普段は建物内のコージェネレーション設備の冷却水として使用していますが、上水の使用ができなくなった災害時には、この井水を処理して建物全体に飲料水を供給できるよう計画しています。
同時に、建物から出される汚水は、建物内の「都心浄化設備」と名付けられた下水処理設備により、隣接する河川に放流できる水質まで浄化（排水処理）することが可能です。ただし、この「都心浄化設備」は微生物のはたらきにより浄化を行うため、災害時に活躍させるためには普段から微生物を生かしておかなくてはいけません。そこで、本設備は通常時も稼働し続ける計画としました。こうして、今この時も、ここで適切に処理された排水が、下水道ではなく敷地に隣接する日本橋川に放流されています。
このように、飲み水のみならず排水も自ら処理することができて初めて「水の自立」と呼ぶことができるのです。

The city center purification facility is located on the 4th basement floor. Under the floor is a large water tank, where wastewater generated in the building is purified using biological and other treatment methods.
Water supply and drainage flow within the building (left) and the flow through the urban purification facility system (right). In an emergency, this system will achieve "water independence" without relying on public infrastructure.

Contributing to the BCP of the entire town through "water independence"

The building has a 1,500m deep hot spring well which supplies hot spring water to the attached hotel, known as "Otemachi Onsen," and to the fitness and hot spring facilities in the basement.
By opening this hot spring facility in the event of a disaster, it will contribute to a hygienic environment for rescue workers and other disaster response personnel who use the hotel as their base of operations, as well as employees involved in business continuity and volunteers.
Even in the unlikely event of an emergency, the building can continue to support the activities of its users with the same ease of use as under normal circumstances, thanks to its water independence. As an office building located in a business hub in the city center, it also provides safety and security in terms of hygiene to the local community, and contributes to BCP (Business Continuity Planning).

The Otemachi Financial City block seen from the north. Tokyo Station is in the background on the left. The Imperial Palace is on the right.
  • A cogeneration facility is a system that uses natural gas, oil, LP gas, etc. as fuel to generate electricity using engines, turbines, fuel cells, etc., and simultaneously recovers the waste heat generated during the process. This building is equipped with a gas engine cogeneration facility, and the waste heat is exchanged as steam for district heating and cooling plant.

Designer's Voice

Designer

Mechanical MEP Engineering Department / Joined in 2002

Shigeto Ito

Shigeto Ito

Water independence has only been realized thanks to the understanding and cooperation of not only the business owner, but also the government, as well as the efforts of everyone who maintains the building on a daily basis. Nothing would make me happier than if people looked at the building and wondered if such equipment existed.
*Affiliation at the time of project assignment

Data

Property Name

Otemachi Financial City Grand Cube
location

1-9-2 Otemachi, Chiyoda-ku, Tokyo
Site area

Approximately 11,200㎡
Total floor area

Approximately 193,600㎡ (excluding hotel building)
scale

31 floors above ground, 4 floors below ground, 2 floors in the penthouse
height

Approximately 170m (maximum height)
Completion

April 2016
Main Applications

Offices, stores, parking lots, district heating and cooling facilities, etc.
Design and Construction Supervision

Mitsubishi Jisho Design /NTT Facilities Design Joint Venture
Construction

Toda Construction (architecture), Yurtec (electricity), Takasago Thermal Engineering (air conditioning), Saikyu Kogyo (sanitation)
Awards
  • FY2016 Lighting Popularity Award
  • 2017 Good Design Award
  • 2017 JIA Excellent Architecture Selection

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MEP Engineering designers talk. Environment and equipment idea notebook

Update : 2022.11.10

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