How do we build bridges that are surrounded by water?

Question

How do we build bridges that are surrounded by water? How is that possible i always wondered how. For example i live in NJ and how did they build the George Washington Bridge and the Lincoln Tunnel Just HOW!!

Answer 1

CAISSON

In engineering, a type of foundation most commonly used underwater for a bridge, but sometimes used in building construction. It is a large hollow structure that is sunk down through the earth by workers excavating from inside it; ultimately it becomes a permanent part of the pier. There are three types: the open caisson, open at both top and bottom; the box caisson, closed at the bottom; and the pneumatic caisson, with an airtight chamber to accommodate submerged workers. Caisson columns, typically 2 ft (0.6 m) or more in diameter, may be used as an alternative to bearing piles. A round hole is dug or bored to a stable layer of earth and temporarily supported by a steel shell, then filled with concrete poured around a cage of reinforcing bars.

Answer 2

Most bridges surrounded by water are built in sections. First, dredges dig circular holes into the sea or lake bed. Concrete pilons are then poured and set in the water. After this, preformed concrete and asphalt slabs are laid on top of each pilon. This process continues until the bridge reaches the anchor on the other side of the body of water.

Answer 3

make diversion water channels for teh flow of the water and then work in the river bed or use other diversion structures

Answer 4

They used large barges and boats. They have cranes on the barges and boats to position the parts.