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Millau Viaduct Prezi DO NOT DELETE
Transcript of Millau Viaduct Prezi DO NOT DELETE
The main road deck is constructed out of trapezoid-shaped metal boxes that are 3.20m tall.
The stay cables are made from T15 strands of class 1,860MPa which are super-galvanized, sheathed, and waxed
The deck and the pylons, entirely of metal, are made of steels of grade S355 and S460are, some of the most common European grades of structural steel.
The massive piers are made from type B60 concrete, a high-strength concrete. This type of concrete was chosen due to its durability characteristics more than its mechanical resistance
In order to build the Millau Viaduct, 19,000 tonnes of concrete-reinforcing steel was used along with 5,000 tonnes of reinforcing steel for the stay cables, and 85,000 cubic meters of concrete was used. If this concrete were water, it would be the equivalent of the flow over Niagara Falls in approximately 30 seconds (Maid of the Mist, 2011). The MIllau Viaduct: The Millau Viaduct is the world's longest and tallest bridge with a cable support. It is located in the valley of Tarn near the town of Millau, France, created to allow a quick transportation between Paris and Barcelona (Spain). Who built it? : It was built by the French company EIFFAGE under concession from the French Goverment. What Type of Structure is it? It's a frame structure. HI!!! What Design They chose and why: The designers chose a bridge because it would not need to dig a tunnel and would not cause much harm to the enviroment. The search for an aesthetically pleasing structure led to the choice of a multi cable-stayed viaduc. The bridge blocks little view of the valley, allowing photographers to take wonderfull pictures. Intended Function: The Millau Viaduct was created because holiday traffic on the route from Paris (France) to Barcelona (Spain). This created a need for a bridge to span the valley. When the bridge was built, it cut travel times through the valley by at least an hour. Now, it is one of the most visited tourist attraction, due to its great height and the beauty of the valley. What sales techniques could they use to advertise the viaduct? Well, this bridge was created out of neccesity, so they could advertise it with an imfomercial, or maybe have an appearance in a show to attract viewers attention through TV. They could also advertise it with brochures with photos. Steps to the construction: In october 2001 the bridge begins construction and is planned to be finished in 4 years, each penalty costing 30 000 dollars. 1: Foundation - The most important step in any major project is insuring that a solid foundation is laid for the structure to rest on. In the case of the Viaduct seven foundations had to be laid for each one of the piers. Each consisted of a base plate and four piles. The piles were 5 meters in diameter and 14 meter long. The bases were made out of reinforced concrete and steel.
2: There are seven piers, The piers hold the road way and the pylons. The piers were constructed using reinforced concrete. The piers had the design of tapering down from top to bottom. The seven piers are identical except for the length due to the valley bottom. Each one created a different challenge. The ground under the heavy piers consist of cracked limestone, and landslides are likely to happen. Following a storm, a landslide occurs and the construction workers must work on stabilizing the landscape in the valley around the piers, to prevent a future landslide.
3: Road Deck - The most important part for the driver. The road deck includes all the areas people will actually move on. The designers decided to go with a steel road deck instead of a concrete because of weight and cost.On May 28, 2004 the north and south sections of the deck conjoined in the middle above the Tarn River.
4: Masts (pylons) and stays - The final stage in the construction process is putting up the final pieces. The masts and the stays are used in supporting the deck of the bridge. The Millau Viaduct is a one of a kind bridge and a great engineering feat. The bridge is the tallest vehicle bearing bridge in the world, so engineers and architects made innovations in the design of this extreme structure:
They use of only one set of cables down the center of the bridge instead of the usual two along the sides of the bridge.
They designed the bridge to have its pylons to split into two instead of having a solid pylon on the way up the bridge.
They came up with an aerodynamic underside to the bridge which actually looks like an airplane wing turned bottom side up, allowing the wind to cut around the bridge in a smooth manner lowering the chance of twisting. To protect the drivers they installed elegant curved wind break grates down the length of the bridge which take the brunt of the force from the wind and pushes it up and away from the roadway.
They use pre-built materials coupled with self moving forms for the pylons which cut down on construction time. In order to assure that the pylons would not be off their mark by the time they reached the massive height gps systems were used in every stage of the construction.
The winds were so strong that they invented hydraulic machines to push the 4,000 ton deck into place and the entire deck was able to be built on the safety of hard ground.