▼项目鸟瞰，aerial view © Schnepp Renou

The Lacassagne telephone exchange is an emblematic building in the Part-Dieu district of Lyon. Built in 1972 by André Gutton, architect of public buildings and national monuments since the 1930s, it is part of the Orange group’s technical heritage. The operation to unite the regional staff of central–eastern France plans for the accommodation of 2,000 people on this unifying site. The project by practices Hardel Le Bihan Architects and HGA-Hubert Godet Architects positions this remarkable building at the centre of the new Orange Campus, functioning efficiently to connect the three buildings (the existing exchange with its two new extensions) and opening up views from and towards each of these for maximum transparency with the city and to maximise light. From an urban point of view, the project complies with plans for the urban renewal of the Part-Dieu district established by the AUC, respecting the original building. Positioned on the south-western edge of the district and seen from the train tracks and the wider landscape, the development forms a powerful landmark as a mark of this renewal.

▼临街外观，street view © Schnepp Renou

▼园区内部，inside view © Schnepp Renou

The Lacassagne exchange naturally orchestrates the corner plot, freeing up two open spaces to the north and the south. The extension, composed of two buildings, is inserted, highlighting the urban alignments and unifying the site. The three entities are linked by the agora, a broad internal street run- ning across, through the ground floor of the exchange. Footbridges provide links between the upper floors. “More than just circulation, the agora is a place for life, for exchange and socialising. Its 7m ceiling height makes it possible to install events spaces for public receptions. A showroom, an auditorium, but also several meeting rooms, the cafeteria, the concierge, all of these spaces are visually connected with the garden on the ground floor.”explains Elodie Vuarchet (HGA). “The more work methods turn to digital and digital connectivity, the more people need quality physical interactions. This is why we have given so much importance to the spaces used every day by the workers around and beyond their workstations.” adds Cyrille Le Bihan (Hardel Le Bihan Architectes).

▼新旧建筑通过长廊相连 © Schnepp Renou the new and existing constructions are connected by agora

The connection and coherence between the new and existing constructions is seen in their massing and facade grids: the folding geometry and truncated slopes shape views, framing the historic exchange, while the slopes incorporate large planted terraces extending the floor plates. In a kinetic play of rhythm and light, the homogenous grid of the facades, in copper-coloured power-coated aluminium, creates a resonance with the brick envelope of the exchange, visible behind its concrete exoskeleton.

▼坡屋顶引入大型植物露台 © Schnepp Renou the slopes incorporate large planted terraces

▼赤褐色铝板网格立面与混凝土框架下的红砖表皮相映成趣 © Schnepp Renou grid of the facades, in copper-coloured aluminium creates a resonance with the brick envelope of the exchange, visible behind its concrete exoskeleton

Orange园区以结构选型和材料的耐久性为特点。设计团队力求忠实于拉帕迪欧区现有建筑的简单形体，同时延续过去的材料和技术，以动态的表达丰富了园区整体。整个基地和建筑内部都提供了健康、明亮且通风的环境。建筑物之间设有开口，工作空间位于邻近日光的地方，受益于0.9m×2.7m玻璃窗户带来的直射光和开阔视野。员工餐厅和陈列室配有大型玻璃组件，也能带来大量自然光。在空气质量和热舒适性方面，每个网格的开口确保了自然通风。遮阳装置和立面深度有助于控制太阳增益，而外保温混凝土结构使墙体具有热惰性。屋顶的露台花园使基地的绿化得以连续，园区西侧就是纳尔逊·曼德拉滨海大道。这里的雨水也得到收集和储存。虽然这些办公室在环境质量和能源性能方面达到了最佳国际标准，但更关键的是它们易于使用、增进健康、对外开放且利于交流。

The Orange Campus is characterised by the durability of its constructive choices and materials. We sought to remain faithful to the geometric simplicity of the buildings already present in the Part-Dieu district, while enriching it with a dynamic constructive expression using materials and techniques that are in the continuity of the recent past. Both on the site as a whole, as well as inside the buildings, the desire to provide a healthy, bright and airy environment is predominant. Openings are created between the buildings, while the distribution favours workspaces being close to daylight sources, benefiting from direct sunlight and open views out thanks to glazing panels that are 0.9m wide by 2.7m high. The staff restaurant and the showroom are given large glazed modules, which also enable maximum penetration of natural light. In terms of air quality and thermal comfort, natural ventilation is ensured by comfort openings in each grid. Shading devices and the depth in the facades contribute to the control of solar gain, while the externally insulated concrete structure allows for thermal inertia. On the roof, terrace gardens provide the vegetal continuity of the site, which is edged to the west by the Nelson Mandela Esplanade. Rainwater is captured and stored. While the offices meet best international standards in terms of environmental quality and energy performance, they are above all agreeable to use and stimulating, open to the outside and propitious to exchange.

▼办公大厅，office lobby © Schnepp Renou

Location: 107, Rue Maurice Flandin, La Part-Dieu, Lyon (69003) Programme: offices (2,000 workstations), showroom, auditorium, staff restaurant, parking (400 places) Client: Pitch Promotion (developer), Orange (end user) Design team: HARDEL LE BIHAN ARCHITECTS and HGA-HUBERT GODET ARCHITECTS Team: Hardel Le Bihan Architectes (Raoul Collados and Thomas Bosi, project leaders), HGA-Hubert Godet Architectes, Bassinet Turquin (associate landscape designer), MOX (approval of construction drawings), R.B.S (structure), Arcora (facades), Tem Partners (MEP), Iliade (QS/ environmental), Builders & Partners (design team coordination) Surface areas: 26,000m² GIA Calendar: Competition 2014, completion September 2020 Materials: concrete (structure), steel (structure of planted terraces), aluminium (facades) Certifications: Effinergie +, French standards for new office buildings, ‘Excellent’ (environmental, 2012 frame of reference) Ready 2 Services frame of reference for offices: – Open system – Independent network – Level of service outside the building – Ambiance control (T°, ventilation and lighting) – Geolocalisation