Banquet, Technical Tours, Company Exhibition

Technical Tour

In July 2020, Tokyo will once again host the Olympic and Paralympic Games, over half a century since the Games were staged here in 1964. Tokyo will also host the PSSC in November 2019 for the first time in 27 years. Since the PSSC was last held in Tokyo, steel structures in Japan, particularly in the capital, have continued to evolve, increasing in area, height and comfort. The choice of Tokyo to host the Olympics, in particular, has sparked interest in such structures in the construction and civil engineering industries, and the past several years have witnessed a proactive execution of new construction and reconstruction of Olympic facilities as well as infrastructure upgrades.
Against such a background, the PSSC2019 Technical Tour Ad Hoc Committee will offer a technical tour to several Olympic facilities and the Metropolitan Expressway site where major renovations to the express structures are under way. We look forward to your participation.

Online reservation is required on the registration form (scheduled to start in April) and will be accepted on a first come, first served basis.
Same-day participation is not available.

Monday, November 11, 2019
8:30 - 14:00 (Snacks & drinks included)
Meeting Place:
JR Shinagawa Station Area Details will be announced later.
Meeting Time:
Departure Time:
Participation Fee:
JPY2,000 –


  1. What to wear: Leather shoes are OK, but skirts and high heels are not advised. Tours may be held in the rain.
  2. Please be punctual and arrive at the gathering location on time. The bus will depart precisely on time, regardless of latecomers.

Tour Route

Tour Route
Ariake Arena

Basic Design and Supervision

Kume Sekkei Co., Ltd.

Design Development/Detailed Design and Construction

Takenaka Corporation

Technical Guidance

Masao Saito


Ariake, Koto-ku, Tokyo

Building Structure:

5 Stories above the ground

Total Floor Area:

Approximately 47,000 sq. meters


36.7 meter

Ariake Arena is planned as an indoor venue stadium of the Olympic and Paralympic Games Tokyo 2020, and has a main arena used for volleyball games that can accommodate approximately 15,000 spectators. After the Olympic and Paralympic Games, it is planned to use the arena as a venue not only for sports events but also for concerts and others.

The main arena has the configuration of exterior walls that open upward and outwards while the roof inside the arena has a downwardly convex structure. Under the restricted site conditions, certain devices are incorporated so that the air volume inside the main arena is minimized while securing spectator capacity. It is planned to reinforce the main structure of the stand section as a concrete structure with high stiffness from the viewpoint of preventing vibration due to the excitation caused by a large number of spectators.

For the core framing structure at the four corners that carries the horizontal force of the roof section during an earthquake, a steel-framed structure is selected, and it is planned to secure sufficient redundancy in terms both of stiffness and strength.
To mitigate the danger that the ceiling and suspended equipment may fall during great earthquakes, a seismically isolated roof structure is adopted with isolation devices arranged directly beneath the roof. For the roof structure, steel-frame plane trusses are used, namely 22 main trusses and 7 connecting trusses arranged orthogonally to the main truss. The main trusses are arranged at 6 m spacing, with a truss depth of approx. 6.4 - 9 m, and a span of about 120 m. In particular, the travelling construction method is adopted for erection of the roof, and each steel-frame plane truss is sequentially assembled on a temporary platform, while a large block of trusses is then moved to travel in an orthogonal direction to the main truss.

Schematic Design/Design Development/
Supervision for Construction documentation and Construction:

Nikken Sekkei Ltd.

Design development/Construction Documentation/Construction:

Shimizu Corporation

Engineering Adviser:

Masao Saitoh

The defining characteristic of this building is the wooden roof that reflects the traditional Japanese wood culture. The roof structure consists of a Composite Beam Strings Structural System. This 69.6 m long beam strings structure is supported by 9.6 m long cantilever trusses on both sides. The total span (88.8 m long) makes this count among the world’ s largest timber structures of this kind.

The top chord of the beam strings structure and the bottom chords of the cantilever trusses are arch-shaped timber beams that take advantage of the good compressive strength of timber. The timber beams consist of laminated wood made of Japanese larch. The bottom chord of the beam strings structure is a steel cable that can achieve an attractive yet light-weight inner appearance.

The Beam Strings Structure can balance horizontal forces induced by its own self-weight within the beam structure itself. This helps to reduce the horizontal load on the supporting frames.

During its erection, the lift-up method is applied to take advantage of the shorter construction term and improved safety. The beam strings structures are assembled on the ground before being raised 30 m to the roof level. The lifting process is conducted in 5 sessions from September 2018 to March 2019. The slanting exterior walls are also covered in Japanese cedar wood. We hope this building with its gently sloping wooden arch roof and warm atmosphere, will allow guests to experience the traditional Japanese wood culture.

Olympic Aquatics Centre
*Exterior Image at the time of the Olympic and Paralympic Games provided
by the Bureau of the Olympic and Paralympic Games Tokyo 2020 Prepared
in November 2017

Schematic Design & Supervision:

Yamashita Sekkei Inc., Ove Arup and Partners Japan Ltd.

Detailed Design & Construction:

Obayashi JV

The Olympic Aquatics Center will serve as the swimming competition venue for Tokyo Olympic and Paralympic Games 2020. The footprint is approximately 200 m in a south-north direction and 130 m in an east-west direction. The structural features are represented by the main arena roof of steel truss spanning 130 m with a base isolation system, the sub arena roof of prestress concrete beams and the prestress concrete-encased steel perimeter columns. The arena roof is assembled at a lower level and then lifted up to the roof level.


Metropolitan Expressway Company Limited

About 55 years have passed since the Pier Section of Higashi-Shinagawa and Reclamation Area of Samezu on the Route 1 Haneda Line were opened in 1963. During these years, performing close inspections of the express structures in this section has been challenging due to the severe use conditions caused by heavy traffic—approximately 70,000 vehicles per day—and the close location to the water—most of the approximately 1.9-kilometer-long section is located over the Keihin Canal. To ensure long-term durability and future maintenance management, Metropolitan Expressway Company Limited launched major renewals, including bridge reconstruction, to the expressway structures, the first undertaking of its kind in Japan. Since the start of the work in February 2016, renewals have been under way while ensuring uninterrupted traffic flow by staggering construction and utilizing detours. Currently, renewals to the inbound lane are at their peak.

Before Renewal
Before Renewal
After Renewal
After Renewal