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When were the first drawbridges made?
For over 8,000 years ago they have been in use in some form.
Are Drawbridges found on lakes?
Drawbridges are usually found on old castles over the moat.
How much do drawbridges cost?
2 dollars
What materials did the Aztecs build drawbridges with?
The Aztecs used a combination of wood, stone, and ropes to build drawbridges. They would create a framework using wooden beams and stone supports, then use ropes to attach the bridge to a mechanism for raising and lowering it. These drawbridges were commonly used in their cities to span canals and waterways.
Why are there drawbrige in a castle?
Castles had drawbridges to allow some people inside, usually by providing a bridge to get over a moat or ditch. Drawbridges could be brought up to keep other people out, such as enemies, since they could not get over the moat or ditch without it.
Who used drawbridges in the middle ages?
Castles over a moat.
Why are drawbridges made?
Drawbridges are made to allow boats to pass underneath while still maintaining a pathway for pedestrian and vehicular traffic. They are designed to rise up or swing open to create a gap for taller vessels to navigate through.
How do you use hydraulics in bridges?
Hydraulic systems may be used to open and close drawbridges.
What are drawbridges used for?
A drawbridge (bascule bridge) is utilized where the low clearance of a bridge over a waterway would not allow some ships and boats to pass beneath it. This is most commonly seen on active waterways where a bridge is desirable for traffic, but taller/larger ships and boats MUST pass through. Alternatives to drawbridges include vertical lift bridges, where the middle section can be raised high enough to allow ships beneath it, and swing bridges that can pivot in the center. Counter-weighted drawbridges, however, are more common, because they were usually cheaper and easier to construct. In many cities with high vehicular traffic, or for interstate highways, drawbridges have been replaced by modern high-rise bridges.
Are mechanical bridges over navigable waters that raise or turn to allow marine traffic to go under them?
Drawbridges.
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