北极星区的第一栋建筑 | First building of the future Polaris District
Brossette街区开发项目使Vincent-Gâche大道的改造得到了完善，其中包括南特岛（Île de Nantes）上有史以来规模最大的建筑。南特岛原先是一个布满仓库的工业区，服务于一家盥洗用具制造商。这一面积达1.5公顷的场地朝向卢瓦尔河，很快将容纳6栋具有综合功能的新建筑，包括已于2018年4月落成的一栋18层高的大厦。
The development of the Brossette site completes the transformationof the Boulevard Vincent-Gâche, with the largest project ever built on the Île de Nantes. This island, formerly an industrial zone of warehouses belonging to the manufacturer of lavatory components, this 1.5 hectare lot facing the Loire River, will soon be home to a total of six new buildings, with mixed-use programs, including a panoramic 18-story tower, delivered in April 2018.
Convinced of the inefficacy of the principle of restrictive specifications briefs (typical of ‘ZACs’ of joint development zones) in the urban fabric, the project, the outcome of a competition, proposes a new method. Integrated into the continuity of the work of the UAPS (authority in charge of the urban development of the Île de Nantes), LAN originated from the design of a master plan and the grand urban principles underpinning this project, and with the office as the lead contractor of a consortium of architects who have worked on this ensemble in order to adjust forms and dimensions able to house the program while strengthening the design of the public space. In parallel, the effort to imbue the neighborhood with a genuine identity is manifested in a jointly decided definition: to imagine the occupation of spaces, establish a relationship between the potential size and the façades, study the prevailing winds and sunlight, are all subjects analyzed together to ensure a coherent urban result.
项目场地被置于一系列正式的建筑系统之间，包括数座建于1970年代、以大型住宅项目或“庄园”为蓝本的建筑；一座带有庭院和花园的、至今未完全建成的办公综合体；以及由建筑师Alexandre Chemeto在市区复兴初期设计的建筑。这种多样化的环境需要一种更具凝聚力的、类似于南特岛城市规划师Anne-Mie Depuydt和Marcel Smets的设计方法。因而设计师通过创造新的立面，使建筑物环绕在公共空间的周围。这些建筑物基于一个带状系统进行布局；它们占据了整个建筑场地并带来新的路径，从而使场地的核心区域与河岸区域形成紧密的连接。随建筑产生的室内区域被置入广场内部、前院、露台和花园，从而能够基于特定的主题以及公共空间的使用需求来调整自身的功能。
The site is at the intersection of several formal systems: buildings dating from the 1970s condominiums based on the model of large housing projects or “estates,” an office complex with courtyards and gardens which was never entirely completed and the intervention of Alexandre Chemeto , architect of the first phase of the islands urban renewal. This heterogeneous context called for an approach bringing greater cohesion, as proposed by Anne-Mie Depuydt and Marcel Smets, the urban planners in charge of the Île de Nantes. Thus, the new buildings enclose the public space by creating fronts.The buildings are laid out based on a system of strips; they cross the site from one end to the other and offer new pathways to place the core area in tension with the banks of the river. The interior areas created by the buildings emerge and are organizedinto squares, forecourts, terraces and gardens, thereby enhancing the range of uses based on specific themes, according to the requirements of the public space.
▼场地的核心区域与河岸区域形成紧密的连接，the buildings cross the site from one end to the other and offer new pathways to place the core area in tension with the banks of the river
Despite the fact this lot is entirely privately owned, all the outdoor spaces are open to the city. The district having become an entirely pedestrian zone is traversed by a central avenue; the backbone of the island, it leads to the core area of the project : a broad plaza in front of the tower, now renamed the “360° View”, will become a public plaza ceded to the city. Here, four enormous polar trees dialog with the façade clad in brushed aluminum. It reflects its surroundings in daylight and enlivens the plaza at night in the interplay of sidelights with the perforated shutters.
▼极地树木与建筑的拉丝铝立面形成对话，enormous polar trees dialog with the façade clad in brushed aluminum
Viewed from the south, the building closes the perspective. From the north, and the river, it sets the tone of the development. At the foot of the tower, Polaris is home to a vast campus, slightly more than 3,000 m2, in which the Vatel international school of hotel management and tourism chose to place its new site. It includes classrooms, a restaurant, a brasserie and a café open to the public, as well as a residence-service for students with 300 apartments. The program also includes an additional 250 apartments and 6,500 m2 of office space and 600 m2 of shops distributed among the different plots of the development. In addition to the alignment of the floors from one building to the next, and they share the regularity of the openings of the façades; each shared space – regardless of its position on the site of the building to which it belongs – come together on the same level, the one offering an unobstructed view of the skyline of the older center city in the distance.
▼融于城市景观的大厦，the building volume merged into the city scape
The urban project is based on the theory that the identity of a city emanates from its urban forms. The Brossette city block comprised of two contrasting formal systems, on one hand the courtyards and garden, on the other the great housing estates, must achieve a synthesis of these two models, in a way that establishes continuity and creates harmonious interconnections. This operation includes the design of 6 buildings and the public spaces. The challenge resides more in the definition of the voids than in the characterization of the volumes. The core of the project is imagined as negative space in the form of a fault: an empty space that one penetrates, and which is designed to serve the other spaces by enhancing the value in terms of light, comfort, wellbeing and functionality.
▼整个项目的核心被设想为一个穿插在实体周围的“负空间”，the core of the project is imagined as negative space in the form of a fault
360°全景大厦 | The 360° View Tower
The 360° View Tower represents the end and the beginning of the Brossette block. Seen from the Loire River, its volume heralds all the elements that will be developed thereafter across the site. Conversely, when viewed from the south, this architecture will complete a succession of spaces and connections that will give the Brossette city block its character. The net volume imagined in the beginning very quickly had to be enlarged and adjusted. This involved a design that took into account the trees, the perspective from the main axis of the site, the dialog with the system of variable heights of the other buildings and its role as a signal.
▼卢瓦尔河视角，view from the Loire River
大厦容纳了79间公寓，以及位于首层的商业空间。它坐落在G. Doumergue 大街和F. Albert大街的转角场地的北端，并位于Brossette街区的数座庭院的轴线上。建筑的边缘平行并后退于G. Doumergue大街，从而留出了宽度为3至7米的公共空间。在F. Albert大街上则后退4至11米不等。建筑的体量同时还与Brossette街区的公共空间保持了平齐。商业空间位于G.Doumergue大街和F. Albert大街的转角处。该空间拥有235平方米的可用面积，并将充分利用其位于卢瓦尔河沿岸和Brossette广场之间的优越位置来激活大厦的底层空间以及附近的公共区域。
It contains 79 apartments as well as commercial space on the ground floor. It is located on the northern end of the lot at the corner of the Boulevard G. Doumergue and the Rue F. Albert. Located on the axis of the Brossette courtyards, the building is the northern edge of the Place Brossette. It stands parallel to the Boulevard G. Doumergue with a setback from the public space ranging from 7 metersto 3 meters (at the intersection of G. Doumergue and F. Albert). On the Rue F. Albert, the building has a setback of 11 meters to 4 meters from the streets (at the intersection of G. Doumergue and F. Albert). The volume is placed in alignment with the Brossette public space. A commercial space is located at the corner of Boulevard G. Doumergue and Rue F. Albert. This space has a usable surface area of 235 m2, and will take advantage of its privileged position between the quays of the Loire and the Place Brossette to enliven the base of the tower and the adjacent public spaces.
▼后退于街道的体量为城市留出了适当的公共空间，the tower stands parallel to the streets with a setback from the public space
The upper floors (G+1 to G+18) contain apartments ranging in size from 1 to 4 bedrooms. The largest apartments take up the upper floors with duplex apartments occupying the top floors (G+17 G+18). The building’s structure (stress-bearing façade + column and beam) allows for great flexibility in floor plans, the distribution of typologies being adaptable according to the requirements of future buyers. The floor space dedicated to the housing part of the program amounts to 4,821 m2 of usable floor space. The building is the highest of all those comprising the Brossette city block, culminating at 55 meters with 18 stories above the ground floor. The building takes full advantage of its height, opening broadly onto its context and especially onto the Loire River and the city’s historic center.
▼立面近景，detailed view of the facade
This building serves as a signal for the development. Its form is composed of three strata: the base (Ground-G+6), the intermediate layer (G+7-G+8), the emergent part (G+9-G+18). The intermediate level and the emergent part are set back, offering spacious private terraces overlooking this privileged context. The volume narrows as it rises, echoing the polar trees beside it. Each shift in volume corresponds to the height of neighboring buildings, harmonizing its relationship among these variations. Benefiting from its exceptional location on banks of the Loire, 84% of the apartments o er views overlooking the river, the remaining part (16%) being oriented in a southerly direction overlooking the Place Brossette.
▼大厦的结构共分为三个层级，the form of the tower is composed of three strata
材料 | Materiality
The smooth brushed aluminum façade gives the building a unified look while capturing the reflections of its context. At night the interplay is inverted and the building is enlivened by the varying uses inside glimpsed through the perforations of the cladding. These also serve to manage the apartments’ exposure to sunshine.
窗户遮板 | Shutters
The façade is composed of a regular horizontal framework applied toall four façades. The design of this framework is imagined from the interior of the apartments to offer framed panoramic views that take full advantage of the tower’s height and the quality of the context (The Loire River, the historic town center, the Île de Nantes). The magnificent perspectives are accentuated by the high and low windows.
▼框架结构的设计来源于为室内提供全景视野的愿景，the design of this framework is imagined from the interior of the apartments to offer framed panoramic views
The concrete stress-bearing façade is covered in an exterior insulation of mineral wool with a brushed aluminum cladding mechanically fixed to a secondary metal frame. The framework of the façade is composed of these solid, horizontal and vertical strips alternating with perforated parts in front of the joinery. The perforated sheet metal is fixed to the front of the lower window, and slides in front of the upper one. The perforated shutter slides vertically (one part upward and one part downward) behind the unperforated aluminum plates.
▼可垂直滑动的带孔遮板，the perforated shutters that can slide vertically
公寓 | Apartments
Most of the apartments benefit from spacious loggias, extending living areas toward the outside. The flooring of the loggias is composed of poured concrete, whereas the vertical partitions are covered in light gray plaster. The joinery, hidden behind the cladding, is in light gray PVC. The fixed cladding and the sliding shutters guarantee the privacy of loggias and offer protection from the wind (especially in the apartments on the upper floors).
▼首层平面图，plan level 0
▼七层平面图，plan level 6
▼八层平面图，plan level 7
▼十四层平面图，plan level 13
▼十六层平面图，plan level 15
PROGRAM: unrestricted affordable and social housing units, student residence, offices, Vatel school, shops, parking.
CLIENT: Kaufman & Broad
DEVELOPER: Samoa SPL – Prime contractor of île de Nantes: Smets /UAPS
ADDRESS: Bd Vincent Gâche,
ZAC Île de Nantes, Nantes
BUDGET: €38m excl. VAT
TOTAL USABLE FLOORS PACE: 34,760m2 CALENDAR: 2013 – 2018
MASTERPLAN AND COORDINATION: LAN TEAM: LAN (lead architect),
Abinal & Ropars (architects of lot 2), Fernandez & Serres (architects of lot 6),
Base (Landscape architect, ALBDO
(Utilities engineers),BETAP and SERBA (Structural engineers),Franck Boutté Consultants (HQE), BMF (Economist), Burgeap (Environmental consultants), Safege (Road Engineering).
photography: © Julien Lanoo, 2018 © Cyrille Weiner, 2018 © LAN Architecture