Saint-Just-Saint-Rambert Bridge

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30 and then 36 wires. The anticorrosion protection of the TMC was done differently on the main cables and on the hangers. For the main cables, in addition to galvanizing the wires, a bitumen-based paint protection was applied to the assembled cable. For the hangers, the galvanized wires were coated with petroleum wax during cable manufacture to fill the voids, and then the cable was sheathed with extruded HDPE under vacuum.

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plate connected to its neighbor by a reinforced concrete anchor. Due to the asymmetry of the site, the pylon on the left bank measures 38 m, while that on the right bank measures 41 m. Similarly, the left bank bases each rest on eight Ø 1,500 piles, while those on the right bank are flat and constructed inside a cofferdam.

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In the first pass, the first four layers of wires can be wrapped around the cable core, namely 6, 12, 18, and then 24 wires, for a total of 61 wires with the core. To achieve the desired diameter, the cable passes back through the coiling machine where additional reels are coupled to create layers of

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The inverted V-shaped pylons are made of B60 concrete. The legs have a rectangular section inclined at 20.5°. This section varies from 2.20 x 1.80 at the top to 2.20 x 3.00 at the deck level. The lower part has an additional wall on the inside, on which the deck rests. Each leg is embedded in a base

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Assembly and tensioning took place during the summer of 2007. Waterproofing and the first layer of asphalt were completed in September - October 2007. Approximately 100 to 150 meters of embankments and roadways on each side of the bridge and the installation of equipment were completed by the end of

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cables thus form inclined planes instead of being parallel. Moreover, it has the particularity of being self-anchored. The anchoring structures are indeed connected to the deck, which results in a portion of the traction forces being transformed into compression in the deck. As a result, the size of

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The hangers were positioned by crane from the deck. Each hanger foot was equipped with a basket for access and a jacking equipment for tensioning and load transfer. During this operation, the suspension cables were lengthened and the deck was shortened. This caused a movement of the saddles towards

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After preliminary studies, the departmental assembly opted for a participatory approach for the final choice of the structure's architecture. Two proposals were put to the Internet users: a classic bridge with parallel cables supported by two trapezoidal-shaped frames, and an innovative bridge with

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The installation of the main cables and deviation saddles required the installation of working platforms at the head of the pylon and a cable walkway. The strands were installed using winches and carts supporting the anchoring sockets. The cables slid through a PEHD chute. Installation was mainly

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In suspended bridges, all forces are transmitted through the suspension cables, which in turn are anchored to anchor masses on both sides of the structure. These must be absolutely stable in both horizontal sliding and tipping. This leads to the construction of abutments and anchoring masses with

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Manufacturing was carried out conventionally using a machine for welded reconstituted profiled sections (PRS). The main difficulty lay in the manufacture of the main brackets, which were all different and had very tight geometric tolerances on the suspension tube. Their manufacture required the

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The structure crosses the river at a relatively low level, and the Loire divides at this point into a minor bed and a secondary branch separated by an island. This configuration allowed for the consideration, from the outset, of an original assembly method for this type of structure: the metal

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In the Saint-Just-Saint-Rambert bridge, an original solution was chosen: the abutments and the deck are rigidly connected, the whole resting on foundation masses. Each cable thus transfers the horizontal component of the forces to the deck in compression, reducing the volume of the necessary

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The first earthworks began in January 2006. The bases of the four legs of the pylons were completed during the summer of 2006. The rest of their construction continued in the second half of 2006, and they were ready to receive the suspension equipment in April 2007.

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After the load transfer, the complex sealing/wearing course and superstructures were installed. This additional load required a further displacement of the saddles, which were immobilized after adjustment, and then the suspension was definitively adjusted.

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The two suspension cables, approximately 305 m long, consist of 19 strands of 77.8 mm diameter assembled in a hexagonal configuration. They pass over a fixed saddle, inclined at 20.5 degrees, before branching out into a fan shape for anchorage in the ears.

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The studies for the structure were conducted from 2003 to 2006 by a project team consisting of a technical engineering firm, QUADRIC; an architectural firm, STRATES; and a team of agents from the Delegation to Infrastructure of the Loire Department.

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From mid-August to mid-October 2006, the first 150 meters of the steel deck frame were assembled on site. The second half of the steel structure was then transported and assembled. By mid-December, the entire structure had been assembled.

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The suspension cables are anchored in reinforced concrete abutments of 7,000 tons due to a reinforced concrete lattice structure. The embedding of the deck is ensured by a transition zone prestressed transversely by eleven 19T15 cables.

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Once the composite slabs were in place, the deck was cast and the suspension was installed from the deck. The suspenders’ tensioning at the end of the assembly straightened the deck and allowed the struts to be removed.

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The main bridge sections, numbering 25 and spaced every 7.692 m, have a constant height between the girders, and have brackets of varying heights. The brackets have a metal tube at the end to receive the

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The structure supports a 2x2 lane road. It has a usable width of 20.55 meters and includes a 3.0 meter wide fast lane and a 3.50 wide slow lane on each side of a central median.

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On 18 December 2006 the deck was pushed approximately 40 meters to the left bank. The last two pushes, of 50 meters and then 30 meters, took place on 11 and 12 January 2007.

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framework of the deck was launched on five temporary struts, three in the Loire bed and two on the pylons. In addition, a 20 m cantilever was used to relieve the overhang.

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cables converging at the top of two triangular frames. 84% of Internet users voted for the triangular bridge. This is the architecture chosen by the Departmental Assembly.

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