▼建筑外观，exterior view ©Camille Gharbi
Flowing like a river between the Avenue de France and Halle Freyssinet are the railway lines, now wider, now merging together. Here, to the right of the Panorama building, the possible area without intermediate supports is 58 meters (190 feet). Everywhere else, the buildings being erected over the railway network have been constructed on a thick platform, a table of concrete on which any collection of buildings conforming to the rules of urban development can be erected at random without planning ahead of time. Urban planners have abandoned the idea of the tabula rasa in favor of a tabula nova : a platform waiting to be developed. This approach is irrational and wasteful. Furthermore, it cannot be transposed to the right of the project because the span is too great, intermediate supports only being possible if a costly reconstruction of the rail infrastructure were to be undertaken.
▼建筑体量横跨于轨道上方，the building is suspended above the railway lines ©Camille Gharbi
Our proposal approaches the problem from the other end. Instead of installing an initial platform, we have suggested suspending the platform forming the roof over the rails from the bridging building. This new theory changes the economic equation, allowing the cost of the invisible platform structure to be integrated with that of the superstructure of the building, this particular geographical arrangement allowing for a different kind of architecture.
▼桥梁式的大楼，轨道两侧的体量相隔58米， the project is designed as a bridge-building resting on either side of the tracks, which are 58 meters apart ©Camille Gharbi
As designed, the building thus becomes a bridge-building resting on either side of the tracks, which are 58 meters apart, its 16,000 tons being suspended above the trains. The effect of this structural arrangement is liberating, making it possible to make particular use of gravitational stresses. Since the stresses are concentrated in the floors forming the bridging structure, the other parts of the building are free. Suspended from or resting on the main structure, they can vary in thickness and embrace elements such as terraces, balconies, loggias, or mezzanines all different ways of expanding the working space depending on orientations and views.This choice of structural design makes it possible to develop comfortable tertiary spaces.
▼大楼立面，building facade ©Camille Gharbi
▼内部庭院视角，view from the inner courtyard ©Camille Gharbi
The different areas and spaces extending from the office areas open onto the city or are screened from it by the use of corbelling. The working areas are able to enjoy these extensions, whether shared or individually acquired.
▼户外露台为大楼的办公区域带来舒适的补充性空间，terraces and balconies expand the working space depending on orientations and views ©Camille Gharbi
▼从露台望向建筑内部，view to the interior from the terrace ©Camille Gharbi
▼城市视野，view to the city ©Camille Gharbi
Paradoxically, these very generous arrangements are the result of the structural constraints of the bridge design and the resolving of the problem of the railway lines by integrating the roof over the tracks into the design rather than using an inefficient supporting platform that would only increase the overall cost of the project. The architecture gains in coherence and the structure itself is implied without drawing attention to itself.
▼从室内望向下方的铁轨，view to the railways beneath ©Camille Gharbi
Tomorrow, the railway lines below will disappear along with the whole network beneath the new construction, but the extraordinary method used will continue to evoke their presence. The beams of the main bridging are concentrated in the floors with façades pierced with a pattern recalling the Vierendeel beams used. The terraces included on the suspended or supported floors are freely varied. Both the memory of the fabrication process and that of the work site are embodied in an architecture that does not necessarily flaunt its muscles but which reveals itself without camouflage, without concealing its initial determining geographical condition. The project sprang from this coherent view; its realization becomes architecture.
▼主桥的横梁被集中设置在两个楼层，大型的空腹桁架犹如“穿透”楼板，the beams of the main bridging are concentrated in the floors with façades pierced with a pattern recalling the Vierendeel beams used ©Camille Gharbi
▼室内细部，interior detailed view ©Camille Gharbi
▼夜景，night view ©Camille Gharbi
▼首层平面图，ground floor plan
PROGRAM: Construction of the bridge-building «Panorama» in Paris
Architect: Marc Mimram Architecture & Associés
Partners : Marc Mimram Ingénierie : structure et economy, Edeis : fluid, VSA : facades, Greenaffair : environment, Léopold Fauconnet : interior designer, Franck Neau : landscaper, Base : land- scaper
Project team Marc Mimram Architecture Ingénierie : Guillaume André, Emilie Ballu, Maxime Lefranc, Jacques Durst, Denis Muet, Sergio Pauletto
Investor : AG2R LA MONDIALE MATMUT, via sa foncière AGLM immo
Victor Buyck : metal frame, Prologis : essential structural, Rinaldi Structal : facades, Ogim : roofing/waterproofing, Vinci énergie : electricity-plumbing, MRG : equipments-hoods, S.N Falleau : green space, Spie Batignolles : architectural interior works, Alma : drywalls, TSM : locksmith / metal work, Thyssenkrupp : elevators
COST OF THE CONSTRUCTION: 50 M€
PLANNING: winner of the competition in 2012 – beginning of the construc- tion in 2014 – project delivery in 2019
AREAS: 16 000 m2 – 15 000 m2 – offices and 1 000 m2 – shops
KEY DATA: 58 meters span – 6000 tonnes of steel