Where Are Arch Bridges Used?

Answer

Arch bridges are usually used on long open spans. This type of bridge was built with stone before iron and steel bridges were introduced. They are difficult to build because they are unstable until the two sides of the arch are joined.
Q&A Related to "Where Are Arch Bridges Used?"
when a flood happens.
http://wiki.answers.com/Q/Where_would_arch_bridges...
1. Analyze the lead or opening hand. Look at the card played by the player to the left. Ask yourself: Is it a suite with only one card (singleton) Is it a possible honor card sequence
http://www.ehow.com/how_7718225_use-arch-bridge-pl...
World's Longest Single Arch Steel Span Bridge Address: Fayetteville,
http://www.chacha.com/question/where-is-the-longes...
I agree with Mr Tell - they were used extensively in the Middle Ages and later, and also by the Romans, who made aqueducts using arches. They were also very popular in Victorian times
http://answers.yahoo.com/question/index?qid=201103...
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The keystone is known to be the most important stone in an arch bridge, without this stone the arch would collapse, this mean that the keystone holds the arch ...
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