News 18-02 (No.362)
Issued : February 25, 2018
Soratio Square—Teikyo University’s New Hachioji Campus
By Akira Ono
Teikyo University’s Soratio Square
Teikyo University’s new Hachioji Campus, named Soratio Square, completed its second and final phase in November, 2017. This campus has a high-rise tower that includes a 500-seat Small Hall and a low-rise wing that primarily houses a 1,000-seat Large Hall and a sports arena. The high-rise tower’s construction and buildout began in February, 2013 and completed in September, 2015 as Phase 1 of the campus project. The Phase 2 work on the low-rise portion of the campus followed the completion of Phase 1 and completed this past November.
NTT Facilities designed the facility and performed project supervise activities. Obayashi Corporation served as the general contractor. Nagata Acoustics participated as the acoustical consultant from design through project completion, providing the full range of consulting services with particular focus for Phase 1 on the Small Hall and for Phase 2 on the 1,000-seat Large Hall. We also conducted acoustical evaluations of the completed project.
<< The Name “Soratio Square” >>
Teikyo University coined the “Soratio” portion of the campus’ name, combining the Japanese word sora, which means “sky” with the Latin word ratio, which means “reason”. The school’s intent in creating this name is to symbolize that the posssibilites its students find during their studies can be as expansive and limitless as the sky. In choosing to append the word “Square” to Soratio to create the new campus’ name, the school wished to emphasize that the campus’ facilities provide numerous spaces for students to interact as people do in a public square.
<< Overview of the Project >>
Small Hall Interior
Two Views of Large Hall Interior
Top Floor Cafeteria
Example of Soratio Square Inter
Soratio Square’s gross floor area totals some 93,000 sq. m (more than 1 million sq. ft). The high-rise portion of the campus rises 99.5 m high (326 ft) with 22 floors above ground and 2 basement levels. The project adopted a seismic isolation structure. In addition to the 500-seat Small Hall and 1,000-seat Large Hall, the facilities include classrooms, research labs (especially for medical and pharma disciplines) and a sports arena. Also, the project included space for Teikyo University Museum where the school stages exhibits of valuable academic materials it collects from students’ successful research results and research processes in the fields of medicine, medical technology and other disciplines. The museum is open to the general public and the school encourages the public to visit the exhibits it organizes in its museum.
Teikyo University’s Hachioji Campus is located at the foot of rolling hills in the Tama Hills neighborhood, a location filled with abundant natural green surroundings. The entire area has a topography of gently rising and falling hills. Soratio Square’s site has a difference of 9 m (30 ft) between its lowest and highest ground elevation. In this environment, the new Soratio Square campus has been architecturally designed to blend well with its surroundings. Traveling from downtown Tokyo on Yaen-Kaido Road when the car comes within about 2 km (1 mile) of the campus and has crossed over the Tama River and then under an overhead section of the Keio Train Line, the campus’ high-rise tower first becomes visible. The building catches the morning sunlight and produces a shimmering reflection, creating a new landmark for the Tama area.
Soratio Square is the largest of Teikyo University’s facilities in Hachioji. It’s generous proportions make it easy for students to move between classrooms and other spaces and the layout shows consideration for ease of movement throughout Soratio Square. The attention to easy access can also be seen in the placement and spaciousness of corridors and lounge areas, which have enjoyable views to the outside. Even the signage that indicates floors and room numbers has been designed to be both easy to understand and with a sensibility that will appeal to the tastes of the university’s students.
<< The 500-Seat Small Hall >>
The Small Hall is located on the first basement level of the high-rise tower that completed in Phase 1 of the project. The project programming identified this room as a space for university lectures as well as other speaking events, symposia and a wide range of other uses. The size of this Small Hall made the construction of its ceiling subject to Japan’s rigorous rules regarding the seismic safety of ceilings in public spaces. We addressed this need by choosing a stretch ceiling system that satisfies the objective of an appropriately lightweight ceiling.
The ceiling material we chose is basically a sound-absorbing material that gives the Small Hall’s entire ceiling a mostly sound-absorbing surface and considerably suppresses the liveliness of the Small Hall’s acoustics. The reverberation time in the Small Hall (at 500 Hz) measures 0.9 second with the hall empty and has a calculated reverberation time of 0.8 second with all seats filled. The reverberation time with these values will provide the clarity of speech performance level that is desirable during lectures and other speaking events.
A topic of particular attention for the acoustics of the Small Hall involved isolating it from sound produced in the space on the floor directly above it. The space directly above the Small Hall, on the ground level of the building, is designed to serve as the main entrance to the university’s bus terminal. During the project, there was concern that the sounds of foot traffic and of items being dropped onto the floor of the bus terminal’s main entrance would transfer to the Small Hall. To address this potential concern we adopted a floating floor structural design for the bus terminal entrance plaza floor and installed impact-absorbing polystyrene that reduces the noise and vibration from foot traffic and dropped objects.
We tested the results of our sound isolation design during our post-construction, on-site evaluations and found that the noise from a standard impact produced in the bus terminal entrance plaza could not be detected at all in the Small Hall’s audience seating. The sound impact level we used in our testing was slightly less than LL-30 (using the Japanese “LL” value for light weight floor impact sound ratings). Considering the expected foot traffic and other impact sounds in the bus terminal entrance plaza, we obtained a successful sound transfer prevention performance level between the small hall and the floor above it.
<< The 1,000-Seat Large Hall Named “Curiosity Hall” >>
The recent completion of Phase 2 of the project adds the 1,000-seat Large Hall to the Soratio Square campus, so that this Teikyo University campus now has both a small and Large Hall. The project programming for the Large Hall anticipated the same kind of lecture and symposium events, plus a wide range of other events as for the Small Hall.
Our decisions for the ceiling of this hall followed the Architectural Institute of Japan’s guidelines for ceilings developed after the Great Tohoku Earthquake. In the Large Hall we installed acoustic tile across the entire ceiling to create a sound-absorbing ceiling surface. As a result, the reverberation time in this hall (at 500 Hz) measures 1.2 second with the hall empty and a calculated 1.1 second when all seats are filled. As with the Small Hall, the hall’s liveliness has been controlled to obtain a level of clarity of speech that suits the kind of lectures and symposium events appropriate to a university setting.
The university named the Large Hall “Curiosity Hall”. I suppose that the reason for this name is the hope that the hall will have events that spark a passion for inquisitiveness and thirst for knowledge among the school’s students.
With the completion of Phase 2 of Teikyo University’s Hachioji “Soratio Square” Campus, students can find here all the benefits of an educational environment, plus an arena and large outdoor athletic field and spaces for Japanese martial arts. The outdoor areas of the campus offer pleasant vistas and places to gather. All in all, it’s a comfortable and, perhaps, ideal campus for pursuing higher education. I hope that the campus’ two halls will be often used and contribute to the academic achievements of the students who study and do research here.
Design team announced for the new “Cité de la Musique” in Geneva
By Marc Quiquerez
In late 2016, the “Fondation pour la Cité de la Musique à Genève” (FCMG) invited 18 architecture offices to lead multidisciplinary design teams and anonymously submit design proposals for a new music center in Geneva (Switzerland). Invited candidates included local Swiss firms and international offices from Europe, US and Japan. Organized in one single phase, the competition officially started in January 9, 2017, with the unveiling of the brief. Competition entries were submitted on August 9, 2017. On October 12, 2017, the results were announced by the Fondation and the president of the jury, French architect Dominique Perrault.
The winning design team is led by the association of Geneva-based architect Pierre-Alain Dupraz and Lisboa-based Gonçalo Byrne. The winning team includes Nagata Acoustics as acoustician and French firm The Space Factory as theater planners.
Exterior view from Place des Nations (competition rendering)
Interior view of philharmonie hall (competition rendering)
The site for the new facility is located at the heart of Geneva’s international district, north of the city center on the right bank of Lake Geneva and just a stone’s throw away from the United Nations headquarters.
The new music center will combine performance venues of different sizes and capacities, the administrative and artistic residence of Orchestre de la Suisse Romande (OSR) and the new premises of Haute Ecole de Musique (HEM), an institution of higher music education. The facility will aim at providing a comprehensive offer of musical performances for audience, as well as create synergies between professionals and students. The main performance venue of the building will be the 1,750-seat philharmonic hall, dedicated primarily for concerts in natural acoustics. The project will be funded privately in its entirety through sponsorships.
Design phase will commence shortly, based on the concept developed in the competition. Construction is expected to begin in late 2020, for a completion by the end of 2023.
More information on the competition and the project can be found here (in French):
Nagata Acoustics Inc.
Hongo Segawa Bldg. 3F, 2-35-10 Hongo
Bunkyo-ku, Tokyo 113-0033, Japan
Tel: +81-3-5800-2671, Fax: +81-3-5800-2672
1990 S. Bundy Drive, Suite 795
Los Angeles, CA 90025
Tel: +1-310-231-7878, Fax: +1-310-231-7816
75, avenue Parmentier
Tel: +33 (0)1 40 21 44 25, Fax: +33 (0)1 40 21 24 00