Queen post
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_PA.jpg) Interior structure of a covered bridge utilizing a Queen-Post structure |
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| Ancestor | Truss bridge |
|---|---|
| Related | None |
| Descendant | None |
| Carries | Pedestrians, livestock, vehicles |
| Span range | short to medium |
| Material | wood planks |
| Movable | No |
| Design effort | medium |
| Falsework required | Sometimes |
A queen post is a supporting post designed to span longer openings than a king post. A king post uses one central supporting post, whereas the queen post uses two.
[edit] Architecture
A queen post bridge has two uprights placed about one-third of the way from each bank. They are connected across the top by a beam and use a diagonal brace between the outer edge. The central square of between the two verticals was either unbraced on shorter spans, or had diagonal braces from the bottom of each queens post to the center of the upper cord. The deck is supported by a king post, which is held up by a triangular truss.[1]
An alternative truss construction used a pair of cross beams between the Queen Posts, forming an 'X'. This is then considered a Warren truss.
[edit] References
- ^ American Barns and Covered Bridges, Eric Sloane, Wilfred Funk, Inc. New York, New York; 1954, pg 96-97
_PA.jpg)
[edit] External links
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