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Author Topic: Bridge beams?  (Read 2327 times)

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Offline 9shooter

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Bridge beams?
« on: November 05, 2008, 09:26:03 PM »
I've been working to get a bridge over a small stream. The span is about 28' so I figure I'll need some beams in the neighborhood of 36-40'.  I looked into the idea of putting in some piers in the stream bed so I could use shorter poles but after hearing about the drain commissioner and the DEQ and the fines I am looking to do a clear span instead. What my question is; would bitternut hickory poles work and are they rot resistant enough if I install them on proper footings? There are plenty of them in the woods and they are straight and long enough.
Earth First! We'll log the other planet's later!

Offline Mad Professor

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Re: Bridge beams?
« Reply #1 on: November 05, 2008, 11:18:32 PM »
I don't think hickory species are rot resistant.

Offline thecfarm

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Re: Bridge beams?
« Reply #2 on: November 06, 2008, 04:22:49 AM »
What are you going to be driving over the bridge with? Just a car,cement truck in the future,big tractor?
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Offline Jim_Rogers

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Re: Bridge beams?
« Reply #3 on: November 06, 2008, 06:44:21 AM »
Yes it is important to understand the intended load first before you decide on types of wood and sizes......
Whatever you do, have fun doing it!
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Offline routestep

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Re: Bridge beams?
« Reply #4 on: November 06, 2008, 09:38:09 AM »
Over in the foresrty and logging section of this website July 5 2008 a fellow had the same question on building a bridge. Lots of solutions given. Take a look.

Offline tyb525

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Re: Bridge beams?
« Reply #5 on: November 08, 2008, 12:52:36 AM »
I think we concluded that I-beams or treated ties/lumber last the longest.
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Offline pineywoods

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Re: Bridge beams?
« Reply #6 on: November 08, 2008, 09:57:28 AM »
Here was my solution...,27763.msg397484.html#msg397484

Center span is about 18 ft. It's used most every weekend.
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Offline scgargoyle

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Re: Bridge beams?
« Reply #7 on: November 08, 2008, 02:53:44 PM »
For a foot bridge (I think up to 2000 lbs) check out They have free span designs up to 50'. I built a 15' one over our garden pond. Interesting project, and very graceful, attractive bridges.
I hope my ship comes in before the dock rots!

Offline moonhill

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Re: Bridge beams?
« Reply #8 on: November 08, 2008, 06:44:25 PM »
I like Don P's solution at the end of pineywood's link.  King or queen post trusses.  28' is quite a distance to carry any load, dead load alone would be bouncy.   The next question would be how to connect the king or queens?      Tim
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