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It has multiple bricks in an arch shape that lock together with a keystone. They then add the walls and deck of the bridge so that the load can be supported. The weight of the rest of the bridge then pushes on the arches from all sides which gives the bridge immense strength.

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14y ago
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11y ago

The key stone (top stone) is shaped like an upside down trapezoid, making it impossible for it to fall through the other stone blocks (also upside down trapezoids). But for this system to be complete, it must have a straight stone edge pushing on both sides.

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Q: How does an arch Bridge Function?
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