Planned from the outset with very great library, the bridge on the river Seine between Tolbiac and Bercy became a reality this year, with a grand opening announced for July 13, through the Paris-range operation. Not later than yesterday, dynamic tests are there were still with a hundred volunteers, large schools walking the quick steps. Known as the Simone-de-Beauvoir, this gateway is the thirty-seventh bridge of Paris and the fourth crossing reserved to pedestrians after the bridge of the Arts (1804, rebuilt in 1984) and gateways Debilly (Expo 1900) and Solferino (1999).
It meets a comparable to this program through the crossing in a single sitting, without stack in Seine, and serving the shores on two levels: the banks down, the square in front of the National Library François Mitterrand and the terrace of the parc de Bercy in height. To reach these remote points, two gateways in extension flying through pathways to greater movement of docks, bringing the total route to 304 metres long for a main crossing of 190 metres between supports.
Falsely symmetric, the gateway linked two arcs inverted to obtain a profile unusually tense over the River. Dietmar Feichtinger, its designer, he was "not cluttering materially and visually plan of water bounded by the Bercy and Tolbiac, bridges the broader Paris". Installed in Vienna and Paris, the Austrian architect-engineer defending a free feat and speaks "of a response adapted to the site and the idea of a walk on the river Seine.
Connecting two major public spaces of the 12th and 13th arrondissements, the gateway changes the collection and uses of these neighbourhoods by counterparts who did not know. The point of view on the national library is transformed, this space intaglio in the dense city taking its meaning. 'More that a transverse link, the gateway is a new Parisian place', insists the winner of the 1999 international who has teamed with the engineers of the RFR Office to study the book. In fact, Simone takes show on the river Seine, suspended over the water.
These urban intentions complete, the technical achievement is not fewer. Architectural party and structural ambition are intimately linked to the image of the overlapping curves conducting the performance. "The two synergistic elements of the work, the low-arc and the catenary lifeboat, collaborate and balance, explains Dietmar Feichtinger," and their nested curves draw crossed paths." The braided lines of force meets the tracery of the paths. In this scheme, the passerby is free to choose his crossing; It can climb to discover the site or down to nest in the hollow of the frame.
Measure vibrations
Structurally, the CRA works in compression when the lifeboat is in tension. Their intersection defines a long Central lens of 106 metres and two lateral consoles stowed at the pillars in the form of boomerangs returned on the back. They resumed their efforts: compression of the RCAF in foot, traction of the lifeboat in the lead, with vertical strapping positioned on the back. The main work and decomposes into three parts distinct, built separately and assembled entirely by welding to form a single piece. The expansion is provided by Underride sliding draughts which return efforts in foundations in ends. Two gateways extension over channels support on the head of the boomerangs, relieving as draughts. The whole is a rectilinear beam ratio of 1: 30 between height and length is phenomenal.
Led by the metal manufacturer Eiffel, the Group of companies awarded the tender European started manufacturing and work on the site in June 2004. The construction of the Central lens returned to Eiffel in its plant in Lauterbourg, Alsace, on the Rhine. Based on seven subsets, this master piece weighs 550 tonnes of a total of 1,600 tons of steel with link gateways. The plate used to two catenary lines and draughts in extension are thick 10 and 15 centimetres to 1 metre wide. The two senior arcs are similarly welded casing width beams. All points of intersection are moulded steel parts, including the head and the elbow of the boomerangs pillars.
Completed in October 2005, the Central lens was forwarded by water via the Rhine, the North Sea and the river Seine, after a wait of three weeks to Rotterdam for the weather window for the sea crossing. Highlight of the site, the hoisting of the lens is made on the night of 28 to January 29, in the climatic requirements of current, wind and temperature. Always on his barge, lens equipped with its oak decking and his body guards (620 tonnes) was placed across the Seine, the consoles above, and then treuillée to its final location, ten metres high. The operation took less than four hours, including audits, the adjustment of the pulls by jacking and provisional fixation on four axes pending final binding parts, manufactured custom and then welded.
From June to July, testing under static loads (550 a ton of water filled cans) and dynamic (100 extras) were performed to measure the behaviour of the work, particularly in terms of vibrations, source of turmoil past gateways Solferino and the Millennium, London. Planned for at the outset, dynamic awarded and viscous dampers have been positioned on length and ends to ensure the comfort of the drive. J - 3, the bridge Simone-de-Beauvoir has hopeful open said.
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