How do you make a bridge in the water?

Answer 1

Usually concrete supports are built IN the water, either resting on the sea floor or actually dug down into it. Then there are a lot of different methods for connecting the land on Side A with the first in-water support, then the second in-water support, then finally to the land on Side B. The part of the bridge that has air underneath it and no support directly underneath is called the "span".

Answer 2

This depends on the type of bridge wanted or needed or possible. Some bodies of water are in need of Suspension, some need an Arch and most do with simple Beams or pylons into the water.

The most basic is the beam bridge. Over narrow bodies of water, like creeks and smaller rivers, beam bridges are at the intersections of want, need, simplicity, cheap and basic. In other words, think of beam bridges like a house of cards but with stronger and more stable materials such as thick wood or concrete and steel. Related to beam bridges are cantilever bridges, which work with the same bases, but work like a more sophisticated house of cards at the top. Overlapping on the deck (or trafficway) creates a type of basic balancing by the redirecting of weight.

The next type of basic bridge structure is the Arch. This works by redistributing weight as well, but without the balancing act like cantilever bridges. This is usually reserved for shallow waters like in a bay or lake.

The last basic bridge type is the Suspension bridge form. This too works by redistributing weight, but in a slightly more complicated way. This form is the best for long and deep waters, relatively speaking.

The three basic types are typically made from concrete and steel, Suspension bridges requiring these materials, and all need "legs" for support. The redirecting of weight carried along the deck needs to go somewhere, and the simple physics (and intuition for the most part) points down towards solid earth. To create these supports on land or in water is for the most part, the same process.

There are also multiple ways to do this. There are piles (long shafts of steel or reinforced concrete,) drilling, or spread. Spread is the simplest and easiest and works much like a dam does with redirected or containing flow and ebbs of the water. Spread is meant for shallow rock beds and usually for or to create lakes.

Piles are the next simplest (in theory) by just pounding supports into the water bed until solid rock is reached and the support can stable. This is meant for deep or shallow rock beds as long as the rock is solid and supporting.

Drilling is the most complicated of the three basic support methods, but it is still simple in practice. This method is mostly reserved for deep or shallow rock beds with a large top bed of loose or unstable rock.

Answer 3

To achieve a solid foundation for the bridge, workers excavated the riverbed in massive wooden boxes called caissons. These airtight chambers were pinned to the river's floor by enormous granite blocks; pressurized air was pumped in to keep water and debris out.

Answer 4

It is built like the way buildings are made, the difference is just they build support in the water.

Answer 5

they make with the long stick and put in the water thats how they did.

Answer 6

with wood and/or metal