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Home » Kume Sekkei Co., Ltd. Architecture from the Showa era to the Reiwa era National Yoyogi Stadium

Kume Sekkei Co., Ltd. Architecture from the Showa era to the Reiwa era National Yoyogi Stadium

[Kume Sekkei Co., Ltd.] Architecture from the Showa era to the Reiwa era [National Yoyogi Stadium]

*View in browser* *Kume Sekkei Co., Ltd.*
Press release: April 4, 2024
Architecture from the Showa era to the Reiwa era [National Yoyogi Stadium] *Kume Sekkei Co., Ltd. (head office location: 2-1-22 Shiomi, Koto-ku, Tokyo) is pleased to announce that the “National Yoyogi Stadium”, which we renovated and designed, has been selected for the Best Renovation Category at the 33rd BELCA Awards. Masu. *
The National Yoyogi Stadium was designed in 1964 by architect Kenzo Tange and others, and has received high acclaim both domestically and internationally for its iconic exterior, which supports the roof with a suspended structure, and its grand pillar-less interior space. Kume Sekkei Co., Ltd. collaborated with Tange Toshi Architects Co., Ltd. and Kawaguchi Mamoru Structural Design Office Co., Ltd. to design the renovations, which included not only seismic retrofitting, but also improved safety and functionality. It received the BELCA Award along with its owner, the Japan Sports Center, and its co-designers and renovation contractors, Shimizu Corporation, Obayashi Corporation, and Sanki Kogyo.
*What is the BELCA Award*
This is an award system for existing buildings that was established with the purpose of contributing to the longevity of buildings. For existing buildings that have been properly maintained over a long period of time or have undergone excellent renovations, we have established two categories: Long Life and Best Renovation, and a selection committee deliberates and selects particularly outstanding buildings. We will honor those who
■Best renovation category
An exemplary building that has been renovated in response to changes in social and physical conditions, with a vision for future long-term use, or to dramatically improve its value.

* [Designer comment] *
Yoyogi Stadium is a masterpiece representing Japanese modernist architecture by Kenzo Tange, which combines a suspended roof structure with a tomoe-shaped floor plan. It has been loved by the citizens despite undergoing numerous renovations, including converting the First Gymnasium, which was an indoor pool, into an arena during the 1964 Tokyo Olympics. More than 50 years have passed since its completion, and as earthquake resistance and safety have become issues, it is a great honor for us as a design organization to participate in the renovation design at a time when it was decided that the venue would be used as a venue for the Tokyo 2020 Olympic and Paralympic Games. , it was also a challenge that came with great responsibility.
For seismic retrofitting, the concept was to continue the basic plan by Makoto Kawaguchi Structural Design Office and not change the design. When it comes to design changes that are absolutely necessary, such as making them barrier-free, we have a system in place to receive guidance and advice from the Japan Sports Promotion Center, Professor Emeritus Yoho Fujioka of Tokyo Institute of Technology, the Cabinet Secretariat, the Ministry of Education, Culture, Sports, Science and Technology, the Agency for Cultural Affairs, and the Japan Sports Agency. I did.
Shimizu Corporation and Obayashi Corporation, which carried out the renovation work, were also the contractors in 1964, and they provided technical support such as reproducing the retaining wall and cubic curved interior through 3D surveying, and shaking table tests using test specimens of the arena ceiling. Achieved quality work. Winning this BELCA award is the result of the efforts of many people involved. I cannot express my gratitude enough to the people at Tange Toshi Architects, who are partners in the design community and have been involved in Yoyogi Stadium as designers for a long time. Thank you everyone.

* [Architectural Overview] *
Name: National Yoyogi Stadium
Address: 2-1-1 Jinnan, Shibuya-ku, Tokyo
Architect: Japan Sports Promotion Center, Independent Administrative Agency Designer: Tange/Kume Sekkei Co., Ltd. Kawaguchi Mamoru Structural Design Office Builder: First Gymnasium Shimizu Corporation/Second Gymnasium Obayashi Corporation/Shimizu Corporation
Total floor area: 40,841.42 square meters
Number of floors: 2 floors above ground and 2 floors underground Structure: RC part S construction
Completion: 1964/Renovation: 2020
Awarded: BELCA Award (Best Renovation Category)/DOCOMOMO
Rehabilitation Award/Earthquake Rehabilitation Excellence Architecture Award

* [Design concept] *
* Preserving the design of masterpieces by reinforcing them in invisible places *
When renovating historic buildings to make them earthquake resistant, our policy was to eliminate reinforcement within the user’s field of view. For both the first and second gymnasiums, time history response analysis was used to evaluate the entire structure, including the roof. For both buildings, we have increased the thickness of shear walls and added piles to the lower structure, reinforced plates for the roof steel members, and reinforced them to prevent buckling, thereby eliminating the need for reinforcement in areas such as stand columns within sight.
Renovations to non-structural components included using existing materials to prevent the arena ceiling from falling off, and reinforcing the 80mm thick slab with carbon fiber sheets. Many murals by Taro Okamoto and others were preserved by increasing the thickness of the RC walls, reinforcing the concrete block walls with
reinforcements, and reinforcing carbon fiber sheets. To improve safety, we have made the building barrier-free by adding handrails, wheelchair seats, ramps, and smoothed pavement, and we have also taken into consideration the resilience of the area by installing toilets that can be used in the event of a disaster.
We strived to preserve the design of the masterpiece with respect for the original, such as returning parts that had been changed in past renovations to the way they were when completed. After renovation, it was designated as an important cultural property in August 2021 as a postwar modernist building that is excellent both in design and technology.

【Company Profile】
Kume Sekkei Co., Ltd.
Developing “richness”. We are a collection of diverse individuals who seriously consider what “wealth” means. We will create new value with an eye to the future while valuing the community and people. Since our founding in 1932, we have designed numerous cities and buildings. We are a company that pursues the fusion of technology and design and aims to contribute to people and society. With our head office located in Shiomi, Koto-ku, Tokyo, we have approximately 650 employees (approximately 450 qualified professionals) and work on a wide range of projects both domestically and internationally. We will contribute to the realization of a sustainable society through technology and design.

Location: 2-1-22 Shiomi, Koto-ku, Tokyo
Representative Director and President Susumu Fujisawa

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