Bridge_project

= [|video] = = = media type="custom" key="22339710" = Bridge = A bridge or a viaduct is a structure built to span a physical obstacle such as a body of water, valley, or road, for the purpose of providing passage over that obstacle”. Bridges are very old and have helped development to allow man carry many things from one place to another separated by a body of water. There are many types of bridges with different characteristics. For example: + Arch bridges + Cable-net bridges + Cable-stayed bridges + Covered bridges + Girder bridges + Hyperbolic paraboloid bridges + Movable bridges + Pontoon bridges + Rigid frames bridges + Stressed ribbon bridges + Suspension bridges + Trestle bridges + Truss bridges.

The Brooklyn Bridge is located in New York, USA, and is one of the greatest engineering constructions of the 19th century becoming in a landmark of this city.

The construction of the Brooklyn Bridge started in 1869 and took 14 years to complete. This Bridge was initially designed by German immigrant John Augustus Roebling, who had previously designed and constructed shorter suspension bridges. Roebling suffered a terrible accident and dies, but before, he had placed his 32-year-old son Washington Roebling in charge of the project.

The bridge crosses the East river between Brooklyn and Manhattan.

__ Construction techniques __

Two huge boxes that were kept afloat by the air contained within it were placed moored on the river to ensure its correct position. Taking the surface of these cells is based on the construction of two towers on them. As the construction of the towers, was completed, the moving crates were sinking due to the weight of the granite. Once the crates arrived at the bottom of the river, a team of operatives began to dig on the muddy bottom of the river, allowing each box to continue moving toward the ground while construction of the two towers continued on the surface.

The boxes were kept free of the water around them through a pipe system which introduced compressed air inside it. Another pipe system allowed the removal of mud to the surface.

__ The materials __ used are: The two main towers are built entirely of granite, the cables are steel.

__ About of suspension bridges: __

This type of bridge, has cables suspended between towers, plus vertical suspender cables that carry the weight of the deck below, upon which traffic crosses. This arrangement allows the deck to be level or to arc upward for additional clearance.

The main forces in a suspension bridge of any type are tension in the cables and compression in the pillars. Since almost all the force on the pillars is vertically downwards and they are also stabilized by the main cables, the pillars can be made quite slender.

__ Advantages: __

Beautiful Bridge

Cash-Value of land in Brooklyn

Convenience for the commuters

Bring Unity to New York

Bring Prosperity to Brooklyn

Unify the whole Country

__ Disadvantages: __

Thought of as impossible

Would have to be the longest bridge ever made

Harsh Conditions

Very Expensive to Build

Bibliography:

1.- A view on cities. []

2.- Great Buildings. []

3.- Suspension Bridges. []

4.- Brooklyn Bridge. []

5.- Brooklyn Bridge. []