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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.
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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......
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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...

http://www.forestryforum.com/board/index.php/topic,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 pacifi.ca. 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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