设计理念 | Architectural concept
Oodi represents a new era of libraries. The newly completed building in the heart of Helsinki consists almost entirely of public space and offers a wide selection of services. It will become the new central point for the city’s impressive public library network.
The design divides the functions of the library into three distinct levels: an active ground floor, a peaceful upper floor, and an enclosed in-between volume containing the more specific functions. This concept has been developed into an arching form that invites people to utilize the spaces and services underneath, inside and on top of it. The resulting building is an inspiring and highly functional addition to the urban life of Helsinki and the Töölönlahti area.
▼从街道望向建筑，view from the street
The Kansalaistori square (“Citizens’ Square”) across the street from the Parliament House seamlessly continues inside the ground floor level of the library building. The flexible spaces are suitable for both small events and large happenings. The movie theater and the multipurpose hall can be used as part of the open lobby space or separated off to cater for specific events. Walking through the ground floor offers a quick glimpse at the services available in the building. The sculptural wooden surface arches over the ground floor areas as a dramatic bridge-like structure. This innovative structural solution has enabled the creation of a column free public space to maximize the accessibility and visibility of the program.
▼首层空间与Kansalaistori市民广场形成了无缝衔接，the Kansalaistori square seamlessly continues inside the ground floor level of the library building
▼具有雕塑感的木制拱形元素，the sculptural wooden surface arches over the ground floor areas as a dramatic bridge-like structure
▼灵活的空间可用于举办各类小型和大型活动，the flexible spaces are suitable for both small events and large happenings
▼电影院外部休息空间，breakout space outside the cinema
▼公共休息区，public seating area
The “Book Heaven” on the top floor, is a vast open landscape topped with an undulating cloud like white ceiling. Here the best features of the modernist library meet the possibilities provided by up-to-date technologies. A calm, serene atmosphere invites visitors to read, learn, think, and to enjoy themselves. From this level visitors can enjoy an unobstructed 360-degree panorama view of the city center.
▼顶层的“图书天堂”犹如一朵起伏的云，the “Book Heaven” topped with an undulating cloud-like white ceiling
▼安静平和的氛围使来访者能够沉下心来进行阅读、学习、思考和放松，a calm, serene atmosphere invites visitors to read, learn, think, and to enjoy themselves
▼中央阅读区，central reading area
▼从顶层俯瞰中间层，view to the middle level
▼书架细部，bookcase detailed view
The middle floor, the “Attic”, consists of flexible irregularly shaped rooms, nooks and corners inhabiting the spaces between the trusses of the bridge structure. The enclosed spaces are designed to accommodate both noisy and quiet activities. The stepped seating in the open central area of this floor is the result of the form of the cantilevering, twisting west façade.
▼从首层通向中间的“阁楼”层，access to the middle floor
▼封闭式的空间可以同时满足安静和嘈杂的活动需要，the enclosed spaces are designed to accommodate both noisy and quiet activities
▼用于支撑顶部桥梁的桁架之间形成了一系列灵活且不规则的空间，the “Attic” consists of flexible irregularly shaped rooms, nooks and corners inhabiting the spaces between the trusses of the bridge structure
By opening directly to the surrounding cityscape and by dissolving the border between indoor and outdoor areas, the building engages directly with the Töölönlahti area. The large foyer and the glass-walled multi-purpose hall on ground level act as indoor extensions of the outdoor spaces.The arching wooden volume creates an entrance canopy over the Kansalaistori square forming a covered outdoor space that expands the building’s functions such as the ground level restaurant to the square. The large public terrace on top of the canopy doubles the amount of public outdoor space available for library visitors and creates a new destination where people can meet and observe the city below.
▼拱形的木制体量在朝向市民广场的入口上方形成一个巨大的顶篷，the arching wooden volume creates an entrance canopy over the Kansalaistori square
There will be three public entrances in the building: one in the south for the main pedestrian flow from the direction of the Central Railway Station, one next to the Kansalaistori square to the west of the building shielded by the overhanging canopy, as well as one for the visitors to the family library and the movie theater in the northeastern corner. The spaces for maintenance and library logistics are located at basement level. The administration and storage spaces are kept to the minimum on the publicly accessed levels to maximize the open and accessible nature of the library. The administrative and storage functions of Helsinki Public Library will remain at the main library in nearby Pasila.
▼从西南方向望向图书馆入口，view from the southwest
在芬兰，图书馆是法定运营的公共设施，因此赫尔辛基图书馆的基本服务均向公众免费开放。新的图书馆将站在城市图书馆体系的最前沿，为市民提供广泛的服务（例如大量的休息空间等），并为赫尔辛基信息中心、Europa Experience信息中心以及由国家视听学院创立的Kino Regina影院提供辅助支持。图书馆每周7天向市民开放。新的图书馆不仅是赫尔辛基大都市区规模最大的图书馆，同时也将成为当地最受欢迎的目的地和公共空间。图书馆预计每日接待1万名访客，年访问量将达到250万人次。
Library operations are statutory in Finland. Basic library services are free of charge and freely available to everyone. The new library will be at the forefront of the renewal of the city’s library services. In addition to the core operations, there will be a wide range of services available inside the building alongside an abundance of lounge spaces and auxiliary services that support the operations such as Helsinki Info, the City of Helsinki’s information center; Europa Experience, the center for EU related information; and Kino Regina, the National Audiovisual Institute’s movie theater. In terms of services offered, the new library, a public space open seven days a week, will be the largest public library in the Helsinki metropolitan area, and will most certainly also become the metropolitan area’s most popular spot for returns and reservations. The library is expected to attract 10,000 visitors per day and 2.5 million visitors per year.
▼图书馆每周7天向市民开放，the new library opens seven days a week to the public
The library will enliven and diversify the new urban environment created in the Töölönlahti area. It will offer activities and experiences for all ages. There will be plenty of spaces that enable people to gather and spend time together, free of charge. The role of the library’s clients will evolve from passive media users to active agents, participants and content producers. As a non-commercial open public space, the new Central Library will act as Helsinki residents’ common living room, work space and learning environment.
▼家庭阅读室，family reading room
技术细节 | Technical details
Oodi’s spatial concept based on three individual public floors is executed by building the library as an inhabited, asymmetrical bridge spanning over 100 meters over the open ground floor space. The bridge structure consisting of steel trusses and beams is supported by two massive steel arches, tensioned together with a reinforced concrete tension slab. The innovative structural solution has enabled both the construction of the flexible column-free interior spaces and the possibility for the construction of a future road tunnel under the site. Secondary steel trusses support the cantilevering balcony and roof canopy asymmetrically from the arch structure, forming a unique structural design to accommodate both permanent and temporary functions for both the library and the public realm.
▼结构轴测图，axon of structure
Oodi has been built using local materials and with local climate conditions in mind. The wooden façade is made from pre-fabricated elements. 33-millimeter-thick Finnish high-quality spruce has been used for the cladding. A specific grading and quality control system was developed for the timber, the sawing and the treatment of the slats. The complex curved geometry was designed and manufactured using algorithm-aided parametric 3D design methods in order to achieve the required precision. The appearance of the façade will develop over the years towards a deeper, richer version of its initial hue.
▼立面的质感和色泽将随着时间的推移而变得愈发细腻和富有深度，the appearance of the façade will develop over the years towards a deeper, richer version of its initial hue
The design of the building envelope is intrinsic to the passive energy approach adopted by the project team. Detailed analysis of the façade performance has informed the environmental solutions and has allowed the team to minimize the requirement for mechanical environmental control systems, which facilitates the highly flexible architectural solution. The glass facades allow for large amounts of functional daylight in the public areas, reducing the use of artificial light and enhancing the quality of the interior spaces as a multifunctional citizen’s forum. The carefully planned placement and optimization of building services has enabled the flexibility of the spatial arrangements. All public levels of the building are equipped with access floors to allow for changes in use during the estimated 150-year life span of the building.
▼玻璃幕墙为公共区域带来充足的自然光，the glass facades allow for large amounts of functional daylight in the public areas
The library building will be extremely energy efficient. Its energy consumption level is that of a nearly Zero Energy Building (nZEB). This is mostly due to the efficiency of the building services. The material efficiency of the building has benefited among other things from the use of wood in the exterior cladding. Building information modeling was used in both architectural and engineering design, as well as in checking the compatibility of the designs. Building information model will also be utilized for maintenance.
▼广场夜景，night view of the square
▼首层平面图，ground floor plan
▼二层平面图，middle floor plan
▼顶层平面图，top floor plan
▼北立面图和南立面图，north facade and south facade
Type: Open international competition, 2012-2013, 1st prize Status: Construction started in 2015, library open to public from December 5, 2018 onwards
Program: Library facilities, meeting rooms, group working space, maker space, living lab, recording studios, photography studio, editing rooms, office space, café, restaurant, movie theater, auditorium, multi-purpose hall, exhibition facilities, information booths, 17,250 m2 total
Construction budget: 98,000,000 €
Location: Töölönlahdenkatu 4, 00100 Helsinki, Finland
Client: City of Helsinki
Architect: ALA Architects
Team at ALA:
Competition phase: ALA partners Juho Grönholm, Antti Nousjoki, Janne Teräsvirta and Samuli Woolston with Aleksi Niemeläinen, Jussi Vuori and Erica Österlund, as well as Willem Barendregt, Martin Genet, Vladimir Ilic, Tiina Liisa Juuti, Julius Kekoni, Auvo Lindroos, Pekka Sivula, Pekka Tainio and Jyri Tartia
Implementation phase: ALA partners Juho Grönholm, Antti Nousjoki, Janne Teräsvirta (until 2015) and Samuli Woolston with Niklas Mahlberg (project architect), Jussi Vuori, Tuulikki Tanska, Tom Stevens, Heikki Ruoho (interior architect), Nea Tuominen, Pauliina Rossi, Anna Juhola and Miguel Silva, as well as Michal Bala, Marina Diaz Garcia, Jyri Eskola, Zuzana Hejtmankova, Harri Humppi, Mette Kahlos, Anniina Kortemaa, Felix Laitinen, Malgorzata Mutkowska, T. K. Justin Ng, Marlène Oberli-Räihä, Olli Parviainen, Alicia Peña Gomez, Anton Pramstrahler, Jack Prendergast, Akanksha Rathi, Niina Rinkinen, Mikael Rupponen, Mirja Sillanpää and Pekka Sivula
Competition phase: Arup (energy technical specialist, mechanical engineering, structural engineering and facade engineering), VIZarch (visualizations), Klaus Stolt (scale models)
Implementation phase: YIT (main contractor), E.M. Pekkinen (contractor for excavation work and basement construction), Ramboll CM (project management) Ramboll Finland (structural engineering, HVAC, energy technology), Granlund (theater technology), Rejlers (electrical engineering and AV consulting), Finnmap Infra & Sipti Infra (geo planning), Helimaki Acoustics (acoustical engineering), Gravicon (BIM coordinator), Palotekninen insinööritoimisto Markku Kauriala (fire safety), Pöyry Finland (traffic planning), Saircon (kitchen design), VIZarch (visualizations) and StoltModels (scale models)