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Bridge build swinging

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A swing bridge is a movable bridge that has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the turning span can then pivot horizontally as shown in the animated illustration to the right. Small swing bridges as found over canals may be pivoted only at one end, opening as would a gate, but require substantial underground structure to support the pivot. In its closed position, a swing bridge carrying a road or railway over a river or canal , for example, allows traffic to cross. When a water vessel needs to pass the bridge, road traffic is stopped usually by traffic signals and barriers , and then motors rotate the bridge horizontally about its pivot point. The typical swing bridge will rotate approximately 90 degrees, or one-quarter turn; however, a bridge which intersects the navigation channel at an oblique angle may be built to rotate only 45 degrees, or one-eighth turn, in order to clear the channel. Many inner cities have swing bridges, since these require less street space than other types of bridges.
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Simple suspension bridge

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Swing bridge - Wikipedia

I thought it would be fun to share the basics of this design as an Instructable for people who have enough skill to be able to take the information and work with it. And as we do in our book, we recommend having your specific design approved by an engineer just to be on the safe side. So here you go! We also have a blog with a fairly recent materials price list, hints and tips, and other projects. Link is at the end of this Instructable. PS Thank you all so much for the votes in the Outdoors Contest!
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diy swinging bridge and more

A simple suspension bridge also rope bridge , swing bridge in New Zealand , suspended bridge , hanging bridge and catenary bridge is a primitive type of bridge in which the deck of the bridge lies on two parallel load-bearing cables that are anchored at either end. They have no towers or piers. The cables follow a shallow downward catenary arc which moves in response to dynamic loads on the bridge deck. The arc of the deck and its large movement under load make such bridges unsuitable for vehicular, or railroad, traffic. Simple suspension bridges are restricted in their use to foot traffic.
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