When consideringhow do they build bridges, especially those requiring piers over a body of water, foundations are made by sinking caissons into the riverbed and filling them with concrete. Caissons are large boxes or cylinders that have been made from wood, metal, or concrete. In the case of...
Bridges are made up of various structural elements that keep the bridges functional and safe for long-term use. While not every bridge is built the same, these general components make up a basic bridge structure. Deck:The deck is the roadway surface of the bridge, where vehicles, pedestrians...
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Bridges. New York: Macmillan, 1993. Cassady, Stephen. Spanning the Gate. Mill Valley, CA: Squarebooks, 1979. Kingston, Jeremy. How Bridges are Made. New York: Facts on File, 1985. Troitsky, M.S. Planning and Design of Bridges. New York: John Wiley & Sons, 1994. Perio...
Why Bridges Move... Watch on Intentional cracks in the sidewalk are a perfect example of how engineers deal with thermal expansion. By filling these gaps with a flexible material, the engineers create what's known as a "expansion joint," something that's meant to help a structure keep its...
Made out of wood or iron, beam bridges are the simplest type of bridge construction. The weight is put on two support girders on either side of the crossing. The earliest examples of beam bridges came in the form of humble logs or tree trunks across streams and rivers. Cable-stayed The ...
可知,最开始的桥是用木头来建造的,They are made of the wood. 故答案为:the wood。 (2) 细节理解题。根据文章第二段最后两句 People made bridges by stretching ropes over rivers. In China and some other countries, rope bridges are still used. 可知,在中国和其它一些国家,绳索桥仍然还在使用,They ...
37 Rope bridges are still used in China and other countries. They're strong enough for more people to walk on. 38 Some of them were built over 1,500 years ago, and they're still in use. Even today, people build arch (拱形的) bridges, but they are usually made of wood or stone....
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Ⅳ.短文填空(20分)kill protect be it how a build safe others unusual Bridges are built for many reasons. Some bridges are built so that cars can cross over rivers.1.are made for trains to use. In Washington State, there is a very 2.bridge.It was built for squirrels ().The town of...