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Building Future Relationships.

Communications have become indispensable to man. Currently there are many advances that enable shorter distances and with other companies to exchange culture, ideas, art, commerce, food or other. Bridges are made to communicate more buildings separated by rivers lakes or other geographic obstacle. There are three types of bridges currently in use, beam bridges, arch bridge and cable stayed bridges. The first one is characterized by a large reinforced concrete beam is supported at its ends on stilts; the loads are transmitted vertically working in compression. The second bridge is characterized by an arcade section that supports the board. It can be made of steel or reinforced concrete and the third one is based in large towers that support the floor by tension. this type of bridge can cover large spans and are made of steel and prestressed concrete, the whole structure works under compression and traction.

The quality of the bridge is measured by its design and technology used during its construction, essentially the bridge where greater efforts are made is the suspension bridge technology, because the buckles and the masts are exposed as well to cover large spans charges should be well distributed. An example of protection was used on the bridge of Normandy where Each cable (the bridge is 184 in total) consists of a set of cables with 15 mm seven chapters each. The strands are hot dip galvanized before being formed into cables and wires are then dressed in a sheath of high density polyethylene high before leaving the factory. A petroleum-based wax is used to fill the spaces between lines and between the cables and the sheath. The same protection is provided for secondary cables that connect the primary wires together. Galvanized coating performs a particular role of protection, by providing a physical barrier to prevent oxidation of steel, due to the electrochemical properties of zinc. In conclusion, bridges are important elements when connecting two places, using them can improve the quality of life of cities. After their existence goods had no chance of being reported and the probability that the trade could grow was low.