Kia ora today we had to answer these questions about pontoon bridges.
Why were the pontoon bridges made?
An early pontoon bridge was constructed in 480 bce by Persian engineers to transport Xerxes' invading army across the Hellespont (Dardanelles). ... Because they obstruct navigation, floating bridges are limited in nonmilitary applications, yet several long-span floating bridges have been built in modern times.
How are they built?
Pontoons were formed by simply lashing several barrels together, by rafts of timbers, or by using boats. Each bridge section consisted of one or more pontoons, which were manoeuvred into position and then anchored underwater or on land.
Hi Ashton
ReplyDeleteIs all of this work in your own words? I cannot give you credit if you haven't made an effort to understand the text and explain it to us on your own. Please have another look.
- Miss Birtch